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2-5-2011 - R. Verdad (tent)
2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS,
apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75 & 60 foot random wire |
2-5-2011 - R. Verdad (tent)
On 11-02-04 11:05 PM, bpnjensen wrote:
2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75& 60 foot random wire Bruce, could you check 1480 Khz AM? I think it's from Texas. Spanish speaking. I got it some months ago, but not much luck lately. mike |
2-5-2011 - R. Verdad (tent)
On 02/04/2011 10:05 PM, bpnjensen wrote:
2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75& 60 foot random wire 60 feet is too short. Even if you have radical bends a longer wire will work better. You could always try the loop. http://hb9tmw.free.fr/EuroNet/HTML/fullloopant.html |
2-5-2011 - R. Verdad (tent)
On 02/04/2011 10:14 PM, m II wrote:
On 11-02-04 11:05 PM, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75& 60 foot random wire Bruce, could you check 1480 Khz AM? I think it's from Texas. Spanish speaking. I got it some months ago, but not much luck lately. mike 1480 is a high band regional channel used in about every third city out west. |
2-5-2011 - R. Verdad (tent)
On Feb 4, 10:14*pm, m II wrote:
On 11-02-04 11:05 PM, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75& *60 foot random wire Bruce, could you check 1480 Khz AM? I think it's from Texas. Spanish speaking. I got it some months ago, but not much luck lately. mike I will give it a try tonight - but we get lousy MW DX here as a rule. |
2-5-2011 - R. Verdad (tent)
On Feb 5, 5:07*am, dave wrote:
On 02/04/2011 10:05 PM, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. Bruce Jensen, CA, USA R75& *60 foot random wire 60 feet is too short. Even if you have radical bends a longer wire will work better. You could always try the loop. http://hb9tmw.free.fr/EuroNet/HTML/fullloopant.html Well - yes, it's too short - and yet it still overloads all of my radii with signals from 50 kW 1100 AM about 2 miles away...and that's just the beginning. RF Hell is right here. I do have a QSL from them though, and for a signal that was considerably weaker than this one :-) |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/5/11 16:32 , bpnjensen wrote:
On Feb 5, 12:55 pm, wrote: On Feb 4, 10:05 pm, wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) . - R75& 60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N& NE& E& SE & S& SW& W& NW& N iwtk ~ RHF . . It's the new one. Well, yes, that's right, an inverted L. The vertical is about 30 feet, the horizontal about 60. Oriented nearly north-south (not checked with a compass), far end is south. Guatemala is off the forward left side if you looking the direction the antenna is aimed. How much does the 30 vertical do for you, other than collect vertically polarized QRM? The only reason, really, I built it this way was to allow the 9:1 antenna unun to be mounted near ground (the ground is not in place yet, but will be soon). Otherwise, I would have put the whole thing up high, or possibly sloped with the unun end down. Once you get your ground in place, experiment with variations of the installation. You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. This morning (1800z onward), the VOA relays from MDG and BOT (Africa) on 16 and 19 meters were coming in almost like locals. Bruce |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 5, 3:35*pm, "D. Peter Maus" wrote:
On 2/5/11 16:32 , bpnjensen wrote: On Feb 5, 12:55 pm, *wrote: On Feb 4, 10:05 pm, *wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) * . - R75& *60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N& *NE& *E& *SE & *S& *SW& *W& *NW& *N iwtk ~ RHF * . * . It's the new one. *Well, yes, that's right, an inverted L. *The vertical is about 30 feet, the horizontal about 60. *Oriented nearly north-south (not checked with a compass), far end is south. *Guatemala is off the forward left side if you looking the direction the antenna is aimed. How much does the 30 vertical do for you, other than collect vertically polarized QRM? *The only reason, really, I built it this way was to allow the 9:1 antenna unun to be mounted near ground (the ground is not in place yet, but will be soon). *Otherwise, I would have put the whole thing up high, or possibly sloped with the unun end down. * *Once you get your ground in place, experiment with variations of the installation. * *You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required.. Bruce Oh, I have overload for sure - I need that attenuator certain times of day. Not sure what I can do for variations? After I get the ground in, the only thing left to add is the Isolator and that's it. Gotta be honest - any less length/height and I won't hear a damn thing below 5 MHz, and those are my favorite bands by far. The weakness of those bands compared to anywhere else I've lived is ridiculous. A large full-wave loop for 90m would be great. Almost impossible to fit, but great. If this does not work, I am just going to buy myself 1,000 feet or wire and head for the most remote beach I can drive to. Ron Howard has great results over at Asilomar near Carmel. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 02/05/2011 02:32 PM, bpnjensen wrote:
How much does the 30 vertical do for you, other than collect vertically polarized QRM? The only reason, really, I built it this way was to allow the 9:1 antenna unun to be mounted near ground (the ground is not in place yet, but will be soon). Otherwise, I would have put the whole thing up high, or possibly sloped with the unun end down. This morning (1800z onward), the VOA relays from MDG and BOT (Africa) on 16 and 19 meters were coming in almost like locals. Bruce 90 feet is way better than 60 feet. Sunspots have been sucky. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 5, 7:23*pm, dave wrote:
On 02/05/2011 02:32 PM, bpnjensen wrote: How much does the 30 vertical do for you, other than collect vertically polarized QRM? *The only reason, really, I built it this way was to allow the 9:1 antenna unun to be mounted near ground (the ground is not in place yet, but will be soon). *Otherwise, I would have put the whole thing up high, or possibly sloped with the unun end down. This morning (1800z onward), the VOA relays from MDG and BOT (Africa) on 16 and 19 meters were coming in almost like locals. Bruce 90 feet is way better than 60 feet. Sunspots have been sucky. You said. The solar flux is still just barely above 80. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 5, 2:32*pm, bpnjensen wrote:
On Feb 5, 12:55*pm, RHF wrote: On Feb 4, 10:05*pm, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) *. - R75 & 60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N & NE & E & SE & S & SW & W & NW & N iwtk ~ RHF *. *. - It's the new one. Well, yes, that's right, an inverted L. The - vertical is about 30 feet, the horizontal about 60. Oriented nearly - north-south (not checked with a compass), far end is south. Guatemala - is off the forward left side if you looking the direction the antenna - is aimed. BpnJ, 'The Antenna's Size' is "The Antenna's Size" : A Fixed Point -how-ever- as the Frequency Varies for 500 kHs to 1 MHz to 2 MHz to 4 MHz to 8 MHz to 16 MHz to 32 MHz the Propagation Characteristics of the Antenna ~change~ So having the Vertical-Up-Leg as your Starting Reference Point and your Far-End as your End-Point should/would allow you to have an Idea {Hunch} about the Receiving Properties of your Fixed Size Antenna on any given High {Shortwave} Frequency [HF]. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 5, 2:32*pm, bpnjensen wrote:
On Feb 5, 12:55*pm, RHF wrote: On Feb 4, 10:05*pm, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) *. - R75 & 60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N & NE & E & SE & S & SW & W & NW & N iwtk ~ RHF *. *. It's the new one. *Well, yes, that's right, an inverted L. *The vertical is about 30 feet, the horizontal about 60. *Oriented nearly north-south (not checked with a compass), far end is south. *Guatemala is off the forward left side if you looking the direction the antenna is aimed. How much does the 30 vertical do for you, other than collect vertically polarized QRM? *The only reason, really, I built it this way was to allow the 9:1 antenna unun to be mounted near ground (the ground is not in place yet, but will be soon). - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. Better would be to have the Feed-in-Line running 4"~6" below the Ground directly under the Wire Antenna Element all the way out to the UnUn and Ground Rod; with the Antenna Element Sloping-Up back over the 'lay' of the Feed-in-Line. ~ RHF |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 02/06/2011 02:14 AM, RHF wrote:
On Feb 5, 2:32 pm, wrote: . - The only reason, really, I built it this way was to - allow the 9:1 antenna unun to be mounted near - ground (the ground is not in place yet, but will be - soon). Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Real slopers have the feedpoint at the top. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 02/06/2011 02:32 AM, RHF wrote:
Better would be to have the Feed-in-Line running 4"~6" below the Ground directly under the Wire Antenna Element all the way out to the UnUn and Ground Rod; with the Antenna Element Sloping-Up back over the 'lay' of the Feed-in-Line. Why not elevate the transmission line overhead and implement a switching arrangement to turn the mess above into a delta loop if needed for fun and education on certain bands. What would the circumference be?? |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 6, 2:14*am, RHF wrote:
On Feb 5, 2:32*pm, bpnjensen wrote: On Feb 5, 12:55*pm, RHF wrote: On Feb 4, 10:05*pm, bpnjensen wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent *conversation, SINPO 15231. *Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) *. - R75 & 60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N & NE & E & SE & S & SW & W & NW & N iwtk ~ RHF *. *. - It's the new one. *Well, yes, that's right, an inverted L. *The - vertical is about 30 feet, the horizontal about 60. *Oriented nearly - north-south (not checked with a compass), far end is south. Guatemala - is off the forward left side if you looking the direction the antenna - is aimed. BpnJ, 'The Antenna's Size' is "The Antenna's Size" : A Fixed Point -how-ever- as the Frequency Varies for 500 kHs to 1 MHz to 2 MHz to 4 MHz *to 8 MHz *to 16 MHz *to 32 MHz the Propagation Characteristics of the Antenna ~change~ So having the Vertical-Up-Leg as your Starting Reference Point and your Far-End as your End-Point should/would allow you to have an Idea {Hunch} about the Receiving Properties of your Fixed Size Antenna on any given High {Shortwave} Frequency [HF]. *. *. - How much does the 30 vertical do for you, other than - collect vertically polarized QRM? How better to get to your 60 Foot Out-Horizontal-Arm 1/3rd Omni-Direction Vertical Antenna +plus+ 2/3rds Off-the-Sides Horizontal Antenna* -and- 45 Degree Out-from-the-Sides Horizontal Antenna* -and- Off-the-End Horizontal Antenna* * Depending on the Frequency *. - The only reason, really, I built it this way was to - allow the 9:1 antenna *unun to be mounted near - ground (the ground is not in place yet, but will be - soon). *Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. *. - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Strong Signals and less noise is good too :o) ~ RHF *. *. Actually, isn't the directionality of a wire along it's axis? That's how the PAR end-fed SWL antenna is, according to Dale... |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 6, 6:09*am, dave wrote:
On 02/06/2011 02:14 AM, RHF wrote: On Feb 5, 2:32 pm, *wrote: * . - The only reason, really, I built it this way was to - allow the 9:1 antenna *unun to be mounted near - ground (the ground is not in place yet, but will be - soon). *Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. * . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Real slopers have the feedpoint at the top. Yepp, but then it's a lot harder to get the thing grounded. Either way, you still get a more omni pattern. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 6, 2:32*am, RHF wrote:
.. - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. Better would be to have the Feed-in-Line running 4"~6" below the Ground directly under the Wire Antenna Element all the way out to the UnUn and Ground Rod; with the Antenna Element Sloping-Up back over the 'lay' of the Feed-in-Line. ~ RHF Why is the alignment important? |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 02/06/2011 09:08 AM, bpnjensen wrote:
On Feb 6, 2:14 am, wrote: On Feb 5, 2:32 pm, wrote: On Feb 5, 12:55 pm, wrote: On Feb 4, 10:05 pm, wrote: 2-5-2011, GUATEMALA, R. Verdad (tent), 4052.5 AM, very weak SS, apparent conversation, SINPO 15231. Not sure what they are using for a TX now, but fair signal. - Bruce Jensen, CA, USA "CA" is a big place north to south "SF Bay Area, CA, USA" would be nicer :o) . - R75& 60 foot random wire BpnJ is this "60 foot random wire" your newly built Shortwave [SWL] Antenna ? -or- an older existing Shortwave Antenna ? ? I thought it was an Inverted "L" Antenna ! -not-just-a- Straight Horizontal 'Flat' Wire Antenna ? *IF* the newly built SWL Antenna is an Inverted "L" Antenna ? How many Feet in the Up-Vertical-Leg ? -and- How many Feet in the Out-Horizontal-Arm ? =Total= Combined Feet of the Antenna Wire +Plus+ The general 'Lay' {Direction} of the Horizontal Antenna Wire from the the Up-Vertical-Leg out to the Far-End of the Out-Horizontal-Arm : N& NE& E& SE & S& SW& W& NW& N iwtk ~ RHF . . - It's the new one. Well, yes, that's right, an inverted L. The - vertical is about 30 feet, the horizontal about 60. Oriented nearly - north-south (not checked with a compass), far end is south. Guatemala - is off the forward left side if you looking the direction the antenna - is aimed. BpnJ, 'The Antenna's Size' is "The Antenna's Size" : A Fixed Point -how-ever- as the Frequency Varies for 500 kHs to 1 MHz to 2 MHz to 4 MHz to 8 MHz to 16 MHz to 32 MHz the Propagation Characteristics of the Antenna ~change~ So having the Vertical-Up-Leg as your Starting Reference Point and your Far-End as your End-Point should/would allow you to have an Idea {Hunch} about the Receiving Properties of your Fixed Size Antenna on any given High {Shortwave} Frequency [HF]. . . - How much does the 30 vertical do for you, other than - collect vertically polarized QRM? How better to get to your 60 Foot Out-Horizontal-Arm 1/3rd Omni-Direction Vertical Antenna +plus+ 2/3rds Off-the-Sides Horizontal Antenna* -and- 45 Degree Out-from-the-Sides Horizontal Antenna* -and- Off-the-End Horizontal Antenna* * Depending on the Frequency . - The only reason, really, I built it this way was to - allow the 9:1 antenna unun to be mounted near - ground (the ground is not in place yet, but will be - soon). Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Strong Signals and less noise is good too :o) ~ RHF . . Actually, isn't the directionality of a wire along it's axis? That's how the PAR end-fed SWL antenna is, according to Dale... That is a very complicated subject. Usually a wire close to the ground has a pattern between a kaleidoscope and a butterfly on acid. Seriously, like a butterfly more often than not, with various lobes and nulls depending on the frequency. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 02/06/2011 09:10 AM, bpnjensen wrote:
On Feb 6, 2:32 am, wrote: . - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. Better would be to have the Feed-in-Line running 4"~6" below the Ground directly under the Wire Antenna Element all the way out to the UnUn and Ground Rod; with the Antenna Element Sloping-Up back over the 'lay' of the Feed-in-Line. ~ RHF Why is the alignment important? I was playing along but wondered the same thing. |
Many Types and Configurations of "Sloper" Antennas
On Feb 6, 6:09*am, dave wrote:
On 02/06/2011 02:14 AM, RHF wrote: On Feb 5, 2:32 pm, *wrote: * . - The only reason, really, I built it this way was to - allow the 9:1 antenna *unun to be mounted near - ground (the ground is not in place yet, but will be - soon). *Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. * . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Real slopers have the feedpoint at the top. Dave a "Sloper" Antenna gets it's name from the fact that the Wire Antenna Element is 'Sloping' : There are many 'types' of so-called "Sloper" Antennas -and- Many 'configurations' of so-called "Sloper" Antennas -all- Built for a specific Radio Listening {Broadcasting} needs and equally practical 'design' considerations. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/6/2011 1:25 PM, dave wrote:
[...] - It's the new one. Well, yes, that's right, an inverted L. The - vertical is about 30 feet, the horizontal about 60. Oriented nearly - north-south (not checked with a compass), far end is south. Guatemala - is off the forward left side if you looking the direction the antenna - is aimed. BpnJ, 'The Antenna's Size' is "The Antenna's Size" : A Fixed Point -how-ever- as the Frequency Varies for 500 kHs to 1 MHz to 2 MHz to 4 MHz to 8 MHz to 16 MHz to 32 MHz the Propagation Characteristics of the Antenna ~change~ So having the Vertical-Up-Leg as your Starting Reference Point and your Far-End as your End-Point should/would allow you to have an Idea {Hunch} about the Receiving Properties of your Fixed Size Antenna on any given High {Shortwave} Frequency [HF]. . . - How much does the 30 vertical do for you, other than - collect vertically polarized QRM? How better to get to your 60 Foot Out-Horizontal-Arm 1/3rd Omni-Direction Vertical Antenna +plus+ 2/3rds Off-the-Sides Horizontal Antenna* -and- 45 Degree Out-from-the-Sides Horizontal Antenna* -and- Off-the-End Horizontal Antenna* * Depending on the Frequency . - The only reason, really, I built it this way was to - allow the 9:1 antenna unun to be mounted near - ground (the ground is not in place yet, but will be - soon). Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Strong Signals and less noise is good too :o) ~ RHF . . Actually, isn't the directionality of a wire along it's axis? That's how the PAR end-fed SWL antenna is, according to Dale... That is a very complicated subject. Usually a wire close to the ground has a pattern between a kaleidoscope and a butterfly on acid. Seriously, like a butterfly more often than not, with various lobes and nulls depending on the frequency. Bruce: I have EZNEC, which is a very good antenna modeling program. I modeled your antenna for various frequencies and created a fairly readable 3D plot of its pattern on various frequencies. In each case, the horizontal wire points in the opposite direction from the Y axis shown in the plots: 1 MHz: http://liberty.3950.net/Jensen%201.PNG 5 MHz: http://liberty.3950.net/Jensen%205.PNG 6 MHz: http://liberty.3950.net/Jensen%206.PNG 7 MHz: http://liberty.3950.net/Jensen%207.PNG 10 MHz: http://liberty.3950.net/Jensen%2010.PNG 15 MHz: http://liberty.3950.net/Jensen%2015.PNG 17 MHz: http://liberty.3950.net/Jensen%2017.PNG 22 MHz: http://liberty.3950.net/Jensen%2022.PNG With all good wishes, Kevin, WB4AIO. -- http://nationalvanguard.org/ http://kevinalfredstrom.com/ |
Designing and Laying-Out a Better SWL "Sloper" Antenna for ShortwaveRadio Listeners
On Feb 6, 9:10*am, bpnjensen wrote:
On Feb 6, 2:32*am, RHF wrote: . - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. - - Better would be to have the Feed-in-Line running - - 4"~6" below the Ground directly under the Wire - - Antenna Element all the way out to the UnUn and - - Ground Rod; with the Antenna Element Sloping-Up - - back over the 'lay' of the Feed-in-Line. - - - - ~ RHF - Why is the alignment important? BpnJ : ? Alignment = Lay-Out = By-Design ! Many Types and Configurations of "Sloper" Antennas http://groups.google.com/group/rec.r...7a96ab218b8103 NOTE : The "Sloper" Antenna normally needs a better more consistent Earthen Ground under it than an Elevated Horizontal "Flat" Wire Antenna. * The "Sloper" Antenna is more of a 'Ground Reflective' Aerial * * The Elevated Horizontal "Flat" Wire Antenna is more of a 'Free Space' Aerial. {Higher Up and Away from the Earth 'Ground'} |
Many Types and Configurations of "Sloper" Antennas
On 02/06/2011 01:49 PM, RHF wrote:
On Feb 6, 6:09 am, wrote: Real slopers have the feedpoint at the top. * Most have a High Feed-Point 25~30 Feet and a Lower End-Point 8~10 Feet {this is to keep the Lower End-Point 'over-head' and not a Hanging a/o Tripping Hazard} Do you know how many volts are at the far end of a dipole when it is fed 100 Watts at resonance? |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 6, 2:52*pm, Kevin Alfred Strom
wrote: On 2/6/2011 1:25 PM, dave wrote: [...] - It's the new one. Well, yes, that's right, an inverted L. The - vertical is about 30 feet, the horizontal about 60. Oriented nearly - north-south (not checked with a compass), far end is south. Guatemala - is off the forward left side if you looking the direction the antenna - is aimed. BpnJ, 'The Antenna's Size' is "The Antenna's Size" : A Fixed Point -how-ever- as the Frequency Varies for 500 kHs to 1 MHz to 2 MHz to 4 MHz to 8 MHz to 16 MHz to 32 MHz the Propagation Characteristics of the Antenna ~change~ So having the Vertical-Up-Leg as your Starting Reference Point and your Far-End as your End-Point should/would allow you to have an Idea {Hunch} about the Receiving Properties of your Fixed Size Antenna on any given High {Shortwave} Frequency [HF]. . . - How much does the 30 vertical do for you, other than - collect vertically polarized QRM? How better to get to your 60 Foot Out-Horizontal-Arm 1/3rd Omni-Direction Vertical Antenna +plus+ 2/3rds Off-the-Sides Horizontal Antenna* -and- 45 Degree Out-from-the-Sides Horizontal Antenna* -and- Off-the-End Horizontal Antenna* * Depending on the Frequency . - The only reason, really, I built it this way was to - allow the 9:1 antenna unun to be mounted near - ground (the ground is not in place yet, but will be - soon). Otherwise, I would have put the whole thing - up high, or possibly sloped with the unun end down. Close to the Ground is 'good'. . - This morning (1800z onward), the VOA relays from - MDG and BOT (Africa) on 16 and 19 meters were - coming in almost like locals. - - Bruce Strong Signals and less noise is good too :o) ~ RHF . . Actually, isn't the directionality of a wire along it's axis? That's how the PAR end-fed SWL antenna is, according to Dale... That is a very complicated subject. Usually a wire close to the ground has a pattern between a kaleidoscope and a butterfly on acid. Seriously, like a butterfly more often than not, with various lobes and nulls depending on the frequency. Bruce: I have EZNEC, which is a very good antenna modeling program. I modeled your antenna for various frequencies and created a fairly readable 3D plot of its pattern on various frequencies. In each case, the horizontal wire points in the opposite direction from the Y axis shown in the plots: 1 MHz:http://liberty.3950.net/Jensen%201.PNG 5 MHz:http://liberty.3950.net/Jensen%205.PNG 6 MHz:http://liberty.3950.net/Jensen%206.PNG 7 MHz:http://liberty.3950.net/Jensen%207.PNG 10 MHz:http://liberty.3950.net/Jensen%2010.PNG 15 MHz:http://liberty.3950.net/Jensen%2015.PNG 17 MHz:http://liberty.3950.net/Jensen%2017.PNG 22 MHz:http://liberty.3950.net/Jensen%2022.PNG With all good wishes, Kevin, WB4AIO. --http://nationalvanguard.org/http://kevinalfredstrom.com/ Wow! These are amazing! Thanks, Kevin. I am somewhat surprised, though, by the apparently omnidirectional character (at least horizontally) on the lower freqs. The higher end looks like a mathematical nightmare! One thing notable too, is the lower angle of radiation on the higher freqs. I wish I could attain those on the lower ones - but the only way to do that is go higher, I guess. |
Designing and Laying-Out a Better SWL "Sloper" Antenna for ShortwaveRadio Listeners
On 02/06/2011 03:04 PM, RHF wrote:
On Feb 6, 9:10 am, wrote: On Feb 6, 2:32 am, wrote: . - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. - - Better would be to have the Feed-in-Line running - - 4"~6" below the Ground directly under the Wire - - Antenna Element all the way out to the UnUn and - - Ground Rod; with the Antenna Element Sloping-Up - - back over the 'lay' of the Feed-in-Line. - - - - ~ RHF - Why is the alignment important? BpnJ : ? Alignment = Lay-Out = By-Design ! Many Types and Configurations of "Sloper" Antennas http://groups.google.com/group/rec.r...7a96ab218b8103 NOTE : The "Sloper" Antenna normally needs a better more consistent Earthen Ground under it than an Elevated Horizontal "Flat" Wire Antenna. * The "Sloper" Antenna is more of a 'Ground Reflective' Aerial * * The Elevated Horizontal "Flat" Wire Antenna is more of a 'Free Space' Aerial. {Higher Up and Away from the Earth 'Ground'} . The sloper's a vertical and needs a bottom half. Grounds work better 6 feet in the air than 6 inches below the earth. All antennas are dipoles. |
Many Types and Configurations of "Sloper" Antennas
On 11-02-06 04:10 PM, dave wrote:
On 02/06/2011 01:49 PM, RHF wrote: On Feb 6, 6:09 am, wrote: Real slopers have the feedpoint at the top. * Most have a High Feed-Point 25~30 Feet and a Lower End-Point 8~10 Feet {this is to keep the Lower End-Point 'over-head' and not a Hanging a/o Tripping Hazard} Do you know how many volts are at the far end of a dipole when it is fed 100 Watts at resonance? well, if it's at the maximum point of the sine wave, it should be p = e^2 / r, or e^2 = 100*75, or e = root (7500) = 87 volts I'm now wondering where the screw up is....I'm assuming a 75 ohm loading. mike |
Many Types and Configurations of "Sloper" Antennas
On Feb 6, 3:10*pm, dave wrote:
On 02/06/2011 01:49 PM, RHF wrote: On Feb 6, 6:09 am, *wrote: Real slopers have the feedpoint at the top. - - * Most have a High Feed-Point 25~30 Feet and a - - Lower End-Point 8~10 Feet {this is to keep the - - Lower End-Point 'over-head' and not a Hanging a/o - - Tripping Hazard} - Do you know how many volts are at the far end - of a dipole when it is fed 100 Watts at resonance? Dave : ? "far end of a dipole" antenna ? Dave how does that related to a "Sloper" Antennas ? Many Types and Configurations of "Sloper" Antennas http://groups.google.com/group/rec.r...7a96ab218b8103 Dave : ? "volts" ? & ? "100 Watts" ? Generally for Receive Only Shortwave Radio Listening [SWL] Antennas Transmitting {powered} Parameters are not a practical consideration. =KASAP= |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/6/2011 6:14 PM, bpnjensen wrote:
[...] Bruce: I have EZNEC, which is a very good antenna modeling program. I modeled your antenna for various frequencies and created a fairly readable 3D plot of its pattern on various frequencies. In each case, the horizontal wire points in the opposite direction from the Y axis shown in the plots: 1 MHz:http://liberty.3950.net/Jensen%201.PNG 5 MHz:http://liberty.3950.net/Jensen%205.PNG 6 MHz:http://liberty.3950.net/Jensen%206.PNG 7 MHz:http://liberty.3950.net/Jensen%207.PNG 10 MHz:http://liberty.3950.net/Jensen%2010.PNG 15 MHz:http://liberty.3950.net/Jensen%2015.PNG 17 MHz:http://liberty.3950.net/Jensen%2017.PNG 22 MHz:http://liberty.3950.net/Jensen%2022.PNG With all good wishes, Kevin, WB4AIO. --http://nationalvanguard.org/http://kevinalfredstrom.com/ Wow! These are amazing! Thanks, Kevin. I am somewhat surprised, though, by the apparently omnidirectional character (at least horizontally) on the lower freqs. You're welcome. Well, the omni pattern an octave or so around the quarter wave resonance isn't too surprising, really, if you think about it. The vertical section gives omnidirectionality in the horizontal plane, but a null directly overhead. The horizontal part fills in that null and is basically elliptical in the horizontal plane. So they complement each other to produce an almost-omni pattern. Nice antenna, really. My 150-foot inverted L was one of my favorite antennas of all time for 75 meter ham use. You might be able to enhance the low angles with a radial ground system, but for receiving on the noisier low bands you might not be able to perceive any improvement beyond higher S-meter readings. A beverage antenna would give you low angle directivity, as would a K9AY loop. The higher end looks like a mathematical nightmare! That's the psychedelic butterfly pattern that Dave was talking about. One thing notable too, is the lower angle of radiation on the higher freqs. I wish I could attain those on the lower ones - but the only way to do that is go higher, I guess. If you want to suppress the high-angle part of the pattern (and make nearby North American signals and static weaker compared to the farther DX), going strictly vertical would help. A horizontal antenna a half wave up has a similar effect (that's up about 100 feet for 60 meters). Have fun, Kevin, WB4AIO. -- http://nationalvanguard.org/ http://kevinalfredstrom.com/ |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 5, 3:35*pm, "D. Peter Maus" wrote:
* *You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required.. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/8/11 11:06 , bpnjensen wrote:
On Feb 5, 3:35 pm, "D. Peter wrote: You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce Excellent. This is good to hear. Congratulations. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 8, 12:22*pm, D Peter Maus wrote:
On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter *wrote: * * You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. *I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. *Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce * *Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. Thanks! |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 8, 2:27*pm, D Peter Maus wrote:
On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter *wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter * *wrote: * * *You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. *I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. *Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce * * Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. *Thanks! * *Always glad to help in what marginal way I may, Bruce. * *If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. * *I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! Three of them - Icom R75, Allied SX-190 and a DX-160. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/8/11 16:39 , bpnjensen wrote:
On Feb 8, 2:27 pm, D Peter wrote: On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter wrote: You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. Thanks! Always glad to help in what marginal way I may, Bruce. If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! Three of them - Icom R75, Allied SX-190 and a DX-160. Oh, that's right...you discussed that SX-190 at some length. Duh... And I remember being envious because of it. So, how does it handle now that you've got a reasonably quiet antenna on the front end? And how does it compare to R75? |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 8, 2:42*pm, "D. Peter Maus" wrote:
On 2/8/11 16:39 , bpnjensen wrote: On Feb 8, 2:27 pm, D Peter *wrote: On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter * *wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter * * *wrote: * * * You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. *I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so.. It has brought otherwise undetectable signals to easy copy. *Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce * * *Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. *Thanks! * * Always glad to help in what marginal way I may, Bruce. * * If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. * * I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! *Three of them - Icom R75, Allied SX-190 and a DX-160. * *Oh, that's right...you discussed that SX-190 at some length. Duh.... * *And I remember being envious because of it. * *So, how does it handle now that you've got a reasonably quiet antenna on the front end? * *And how does it compare to R75?- Hide quoted text - - Show quoted text - The R75 is considerably more sensitive and/or with a better s/n ratio, given the same antenna system. Things are fairly audible on the R75 that are in the hash on the SX-190. Still, the SX-190 is a bunch of fun. For a bad hum, I need to get either a capacitor replacement on the power supply, or figure out the wiring on the 12VDC plug (an oddly configured 4-prong socket) and see if that does the trick. Also might be some bad caps in the audio chain. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/8/11 16:49 , bpnjensen wrote:
On Feb 8, 2:42 pm, "D. Peter wrote: On 2/8/11 16:39 , bpnjensen wrote: On Feb 8, 2:27 pm, D Peter wrote: On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter wrote: You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. Thanks! Always glad to help in what marginal way I may, Bruce. If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! Three of them - Icom R75, Allied SX-190 and a DX-160. Oh, that's right...you discussed that SX-190 at some length. Duh... And I remember being envious because of it. So, how does it handle now that you've got a reasonably quiet antenna on the front end? And how does it compare to R75?- Hide quoted text - - Show quoted text - The R75 is considerably more sensitive and/or with a better s/n ratio, given the same antenna system. Things are fairly audible on the R75 that are in the hash on the SX-190. Still, the SX-190 is a bunch of fun. For a bad hum, I need to get either a capacitor replacement on the power supply, or figure out the wiring on the 12VDC plug (an oddly configured 4-prong socket) and see if that does the trick. Also might be some bad caps in the audio chain. Given its age, a few questionable caps should be expected. A couple of hours with a fine soldering iron will do wonders. |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On Feb 8, 2:39*pm, bpnjensen wrote:
On Feb 8, 2:27*pm, D Peter Maus wrote: On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter *wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter * *wrote: * * *You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. *I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so.. It has brought otherwise undetectable signals to easy copy. *Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce * * Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. *Thanks! * *Always glad to help in what marginal way I may, Bruce. * *If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. * *I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! *Three of them - Icom R75, Allied SX-190 and a DX-160. -fwiw- The "Allied AX/SX-190 Receiver" a 'Resource Collection' Compliments of Mark Rehorst http://deane.bio.ucalgary.ca/Allied-...Info-Oct02.pdf |
60 Foot Random Wire Shortwave [SWL] Antenna ?
On 2/8/11 21:44 , bpnjensen wrote:
On Feb 8, 7:28 pm, wrote: On Feb 8, 5:49 pm, wrote: On Feb 8, 2:42 pm, "D. Peter wrote: On 2/8/11 16:39 , bpnjensen wrote: On Feb 8, 2:27 pm, D Peter wrote: On 2/8/11 16:03 , bpnjensen wrote: On Feb 8, 12:22 pm, D Peter wrote: On 2/8/11 11:06 , bpnjensen wrote: On Feb 5, 3:35 pm, "D. Peter wrote: You do have a quite a bit of antenna, there. Verify that you've not got too much. Look for images, indicating overload. A pad may be required. FWIW, I have found that this new antenna, even before the unun is grounded, works *extremely* well on almost all bands for elimination of electrical hash noise with my DX-Ultra and MFJ-1026. I can lop off 4-8 S-Units of hash noise while scarcely touching the desired signal, leaving otherwise obscured signals either in the clear or almost so. It has brought otherwise undetectable signals to easy copy. Right now, I'm wishing I had room for two of them - I could silence 60 and 90 meters background with them. Maybe I'll take down the DX-Ultra and put up another one of these. I'd hate to lose the DX-U (it's great on everything 41 meters and up), but two matched antennae on the MFJ-1026 would work wonders, I think. Bruce Excellent. This is good to hear. Congratulations.- Hide quoted text - - Show quoted text - Without counting all my chickens before they hatch, I will say I am very pleased - and grateful to you, Peter, and the other folks including Roy, Dave, Kevin, MII and others who have chimed in with their help and advice. Thanks! Always glad to help in what marginal way I may, Bruce. If you've had THAT kind of noise reduction, you're going to enjoy a whole new world of listening. I know you've mentioned it before, but I've had lunch since then...which receiver are you feeding with this?- Hide quoted text - - Show quoted text - LOL! Three of them - Icom R75, Allied SX-190 and a DX-160. Oh, that's right...you discussed that SX-190 at some length. Duh... And I remember being envious because of it. So, how does it handle now that you've got a reasonably quiet antenna on the front end? And how does it compare to R75?- Hide quoted text - - Show quoted text - The R75 is considerably more sensitive and/or with a better s/n ratio, given the same antenna system. Things are fairly audible on the R75 that are in the hash on the SX-190. Still, the SX-190 is a bunch of fun. For a bad hum, I need to get either a capacitor replacement on the power supply, or figure out the wiring on the 12VDC plug (an oddly configured 4-prong socket) and see if that does the trick. Also might be some bad caps in the audio chain.- Hide quoted text - - Show quoted text - Is it a regular AC 60 Hz hum ? It sure sounds like it - present at all audio volume levels - but when the volume is turned up to maximum, at about 3/4 volume the hum gets louder - that's why I think it may be a combination. Sufficient power supply ripple alone would keep the RF stages from working, and the AF stages from amplifying an intelligible signal. It would also be relatively constant in amplitude. But a moderate amount of power supply ripple would produce an audible hum regardless of volume setting, and because the ripple is impressed on the preamp stages and at various locations throughout the receiver there would be a variation in audible hum with volume control. Start by replacing the power supply capacitors. And then replace all the bypass and decoupling caps. And then the interstage caps. Eventually, all the electrolytics will go. You'll be amazed at the difference. |
WHY ? Does The SWL "Sloper" Antenna Have A 'Down-Wire' ?
On Feb 10, 5:25*am, dave wrote:
- - On 02/09/2011 07:58 PM, RHF wrote: - - . - - Somewhere I remember reading that a SWL'er* had - - taken a longer piece of Insulated Stranded Copper - - Wire and repaced the shorter Down-Wire of his - - "Sloper" Antenna. *Routed/Run this Insulated Wire - - down the Side of the House and out along the ground - - under the 'Lay' of the Sloping Antenna Wire Element. - - * Claim that his produced the best Signals and least - - noise and was better than grounding the Down-Wire - - at the Side of the House. {I have not tried that yet} - - . - SWLers claim a lot of bogus things. Dave, IMHO : More Often Then Not The SWL'ers State The Simple Honest Factual Truth As They Hear* It :o) * Their Own Personal Subjective Experience {What Appears To Work For Them} -versus- Objective Measured Evidence and Advertising Hype What I have found out over the years Dave is what Works for one Shortwave Radio Listener [SWL] in one location does not necessarily translate and work for the guy : down-the-street over-the-hill; down-on-the-3rd-floor; etc etc etc... The Is NO Single Right Way {One Size Does NOT Fit All} Generally I take people at their Word and their Claimed Results : Look just this last few weeks BpnJ built his own new home brewed SWL Antenna and says it produces a better Signal and Lower Noise than his Commercial DX-Ultra http://www.universal-radio.com/catalog/sw_ant/3377.html Professionally Engineering and Factory Made SWL Antenna. http://groups.google.com/group/rec.r...efdc4caaa8ceff Simply Happy That BpnJ is Getting Better Results |
WHY ? Does The SWL "Sloper" Antenna Have A 'Down-Wire' ?
On Feb 9, 7:58*pm, RHF wrote:
On Feb 6, 3:15*pm, dave wrote: On 02/06/2011 03:04 PM, RHF wrote: On Feb 6, 9:10 am, *wrote: On Feb 6, 2:32 am, *wrote: . - Otherwise, I would have put the whole thing up high, - or possibly sloped with the unun end down. - - Better would be to have the Feed-in-Line running - - 4"~6" below the Ground directly under the Wire - - Antenna Element all the way out to the UnUn and - - Ground Rod; with the Antenna Element Sloping-Up - - back over the 'lay' of the Feed-in-Line. - - - - ~ RHF - Why is the alignment important? BpnJ : ? Alignment = Lay-Out = By-Design ! Many Types and Configurations of "Sloper" Antennas http://groups.google.com/group/rec.r...7a96ab218b8103 NOTE : The "Sloper" Antenna normally needs a better more consistent Earthen Ground under it than an Elevated Horizontal "Flat" Wire Antenna. * The "Sloper" Antenna is more of a 'Ground Reflective' Aerial * * The Elevated Horizontal "Flat" Wire Antenna is more of a 'Free Space' Aerial. {Higher Up and Away from the Earth 'Ground'} * . The sloper's a vertical and needs a bottom half. Grounds work better 6 feet in the air than 6 inches below the earth. - - All antennas are dipoles. Dave you did not address the Question : WHY ? Does The SWL "Sloper" Antenna Have A 'Down-Wire' ? Dave : ? Care to Comment ? |
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