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Eavesdropper Dipole
I finally got my old Eavesdropper dipole antenna up in the air again in
preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA |
Eavesdropper Dipole
On Jul 21, 1:25 pm, dxAce wrote:
I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both ? Anyone tried them both Side-by-Side ? |
Eavesdropper Dipole
RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF What do you think? |
Eavesdropper Dipole
On Jul 21, 2:56 pm, dxAce wrote:
RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF What do you think?- Hide quoted text - - Show quoted text - I could assume . . . |
Eavesdropper Dipole
RHF wrote: On Jul 21, 2:56 pm, dxAce wrote: RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF What do you think?- Hide quoted text - - Show quoted text - I could assume . . . Well, if you were using a dipole antenna, and you were located here, how would you orient it if you wanted reception from South America? Put your thinking cap on... |
Eavesdropper Dipole
On Sat, 21 Jul 2007 16:25:31 -0400, dxAce
wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA Why is it called an Eavesdropper? Ya drop it from the eaves? bob k5qwg |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 23, 3:36 pm, RHF wrote:
On Jul 22, 3:59 pm, D Peter Maus wrote: RHF wrote: How Do They Compare For Shortwave Listening (SWL) ? Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one using a Eavesdropper Trapped Dipole Antenna ? [ For Shortwave Listening (SWL) ] Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both for Shortwave Listening (SWL) ? Anyone tried them both Side-by-Side ? [ For Shortwave Listening (SWL) ] . . . . = = = On Jul 21, 2:48 pm, RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres).http://www.universal-radio.com/catal...http://www.ant... Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres).http://www.durhamradio.com/s/product...5&cat=1845&pag... Anyone used both ? Anyone tried them both Side-by-Side ? . . . . I have both an Eavesdropper and a DX Ultra. The Eavesdropper is setup in an inverted V configuration and is virtually omnidirectional. It's got a small footprint. Takes up little real estate. It's also very quiet. The DX Ultra is very large. And correctly set up according to A-D recommendations, it's also very tall, and visible over the second story of my house. Both need to be erected far from the house, to eliminate noise sources. DX Ultra is very sensitive. Not quite as quiet as the Eavesdropper....likely due more to the smaller capture area of the Eavesdropper than anything else. The DX Ultra also has a lower practical frequency limit than the Eavesdropper. Although you don't really notice it so much on MW because of the huge powers at play. I've been able to overload my receivers on the DX Ultra, but not the Eavesdropper. If you have the real estate, the DX Ultra is the better choice for most listening. If not, the Eavesdropper is fine.- Hide quoted text - - Show quoted text - DPM - Thank You for the Interesting and Informative personal assessment of both of these high quality Shortwave Radio Listening (SWL) Antennas. Any other Eavesdropper Trapped Dipole Antenna or Alpha Delta DX-Ultra Shortwave Antenna owner users out-there with comments of info ? -cause- i want to know - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - I have a DX Ultra on a woefully small suburban/urban lot here in the SF Bay area. It is oriented prett kuch the only way I can make it fit on my lot. The center is around 25' high, and the ends are about 8 feet (gently-inverted V). It is over one end of my house. The two sides of the antenna are not in perfect alignment - one end is askew from the other by abotu 10 degrees. Overall, the center is about "aimed" toward 140/320 (using the same convention as that given by DXAce above), give or take 10 degrees. It is fed by about 100 feet of heavy, quality 50 ohm coax cable, with a tight 8" coil as a balun taking up about half of that length. The antenna itself is not grounded, but the radio is. This thing picks up some noise, but is far more noisy on lower freqs, like 5.5 MHz and below. I think the balun coil helps the higher freqs remarkably in this respect. It almost behooves me to make a *huge* coil that wil be effective at lower freqs. I think the antenna does poorly at freqs below 5 MHz anyway - a random piece of wire strung up in practically any orientation yields generally better results. I have tested the antenna for electrical continuity many times and have foud ti to be continuous, so it isn't that the internal connections are poor. I have also replaced the center static element with a new one, so that isn't the culprit. It could be that the darn thing just isn't high enough or oriented properly. Of course, it may also well be that the signals are there, but the 25 sources of local noise murder them. At higher freqs, especially 11 MHz and above, it is fabulous - everything is loud, crisp and clear. 9 MHz is very good, 6 & 7 MHz so- so, althgough once in a while these bands light up and really shine. RHF - If you are down this way at all, let me know - you're welcome to stop in and see the thing. Bruce Jensen |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
In article .com,
RHF wrote: On Jul 23, 3:36 pm, RHF wrote: On Jul 22, 3:59 pm, D Peter Maus wrote: RHF wrote: How Do They Compare For Shortwave Listening (SWL) ? Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one using a Eavesdropper Trapped Dipole Antenna ? [ For Shortwave Listening (SWL) ] Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both for Shortwave Listening (SWL) ? Anyone tried them both Side-by-Side ? [ For Shortwave Listening (SWL) ] . . . . = = = On Jul 21, 2:48 pm, RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres).http://www.universal-radio.com/catal...0.htmlhttp://w ww.ant... Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres).http://www.durhamradio.com/s/product...d=44945&cat=18 45&pag... Anyone used both ? Anyone tried them both Side-by-Side ? . . . . I have both an Eavesdropper and a DX Ultra. The Eavesdropper is setup in an inverted V configuration and is virtually omnidirectional. It's got a small footprint. Takes up little real estate. It's also very quiet. The DX Ultra is very large. And correctly set up according to A-D recommendations, it's also very tall, and visible over the second story of my house. Both need to be erected far from the house, to eliminate noise sources. DX Ultra is very sensitive. Not quite as quiet as the Eavesdropper....likely due more to the smaller capture area of the Eavesdropper than anything else. The DX Ultra also has a lower practical frequency limit than the Eavesdropper. Although you don't really notice it so much on MW because of the huge powers at play. I've been able to overload my receivers on the DX Ultra, but not the Eavesdropper. If you have the real estate, the DX Ultra is the better choice for most listening. If not, the Eavesdropper is fine.- Hide quoted text - - Show quoted text - DPM - Thank You for the Interesting and Informative personal assessment of both of these high quality Shortwave Radio Listening (SWL) Antennas. Any other Eavesdropper Trapped Dipole Antenna or Alpha Delta DX-Ultra Shortwave Antenna owner users out-there with comments of info ? -cause- i want to know - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - OK - So here is another Question : Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF Slow learner. -- Telamon Ventura, California |
Eavesdropper Trapped Dipole Antenna -vice- Alpha DeltaDX-Ultra...
I have to watch this great old (1943) movie now, on Radio tb, Air Force.
cuhulin, Fast Learner |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 24, 7:57 pm, Telamon
wrote: In article .com, RHF wrote: On Jul 23, 3:36 pm, RHF wrote: On Jul 22, 3:59 pm, D Peter Maus wrote: RHF wrote: How Do They Compare For Shortwave Listening (SWL) ? Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one using a Eavesdropper Trapped Dipole Antenna ? [ For Shortwave Listening (SWL) ] Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both for Shortwave Listening (SWL) ? Anyone tried them both Side-by-Side ? [ For Shortwave Listening (SWL) ] . . . . = = = On Jul 21, 2:48 pm, RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres).http://www.universal-radio.com/catal...0.htmlhttp://w ww.ant... Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres).http://www.durhamradio.com/s/product...d=44945&cat=18 45&pag... Anyone used both ? Anyone tried them both Side-by-Side ? . . . . I have both an Eavesdropper and a DX Ultra. The Eavesdropper is setup in an inverted V configuration and is virtually omnidirectional. It's got a small footprint. Takes up little real estate. It's also very quiet. The DX Ultra is very large. And correctly set up according to A-D recommendations, it's also very tall, and visible over the second story of my house. Both need to be erected far from the house, to eliminate noise sources. DX Ultra is very sensitive. Not quite as quiet as the Eavesdropper....likely due more to the smaller capture area of the Eavesdropper than anything else. The DX Ultra also has a lower practical frequency limit than the Eavesdropper. Although you don't really notice it so much on MW because of the huge powers at play. I've been able to overload my receivers on the DX Ultra, but not the Eavesdropper. If you have the real estate, the DX Ultra is the better choice for most listening. If not, the Eavesdropper is fine.- Hide quoted text - - Show quoted text - DPM - Thank You for the Interesting and Informative personal assessment of both of these high quality Shortwave Radio Listening (SWL) Antennas. Any other Eavesdropper Trapped Dipole Antenna or Alpha Delta DX-Ultra Shortwave Antenna owner users out-there with comments of info ? -cause- i want to know - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - OK - So here is another Question : Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF Slow learner. -- Telamon Ventura, California- Hide quoted text - - Show quoted text - Slow but Willing ~ RHF |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-UltraShortwave Antenna
RHF wrote:
On Jul 23, 3:36 pm, RHF wrote: On Jul 22, 3:59 pm, D Peter Maus wrote: RHF wrote: How Do They Compare For Shortwave Listening (SWL) ? Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one using a Eavesdropper Trapped Dipole Antenna ? [ For Shortwave Listening (SWL) ] Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both for Shortwave Listening (SWL) ? Anyone tried them both Side-by-Side ? [ For Shortwave Listening (SWL) ] . . . . = = = On Jul 21, 2:48 pm, RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres).http://www.universal-radio.com/catal...http://www.ant... Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres).http://www.durhamradio.com/s/product...5&cat=1845&pag... Anyone used both ? Anyone tried them both Side-by-Side ? . . . . I have both an Eavesdropper and a DX Ultra. The Eavesdropper is setup in an inverted V configuration and is virtually omnidirectional. It's got a small footprint. Takes up little real estate. It's also very quiet. The DX Ultra is very large. And correctly set up according to A-D recommendations, it's also very tall, and visible over the second story of my house. Both need to be erected far from the house, to eliminate noise sources. DX Ultra is very sensitive. Not quite as quiet as the Eavesdropper....likely due more to the smaller capture area of the Eavesdropper than anything else. The DX Ultra also has a lower practical frequency limit than the Eavesdropper. Although you don't really notice it so much on MW because of the huge powers at play. I've been able to overload my receivers on the DX Ultra, but not the Eavesdropper. If you have the real estate, the DX Ultra is the better choice for most listening. If not, the Eavesdropper is fine.- Hide quoted text - - Show quoted text - DPM - Thank You for the Interesting and Informative personal assessment of both of these high quality Shortwave Radio Listening (SWL) Antennas. Any other Eavesdropper Trapped Dipole Antenna or Alpha Delta DX-Ultra Shortwave Antenna owner users out-there with comments of info ? -cause- i want to know - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - OK - So here is another Question : Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF . . . . A-S claims Eavesdroppers have been mounted horizontally, as inverted V, as slopers, in attics, and around corners. All with good results. For the most part, it's omni directional. I"m not sure that Ace is going to see much of a directional characteristic at his venue. What there may be, may be relatively small. |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 24, 4:03 am, RHF wrote:
On Jul 23, 3:36 pm, RHF wrote: On Jul 22, 3:59 pm, D Peter Maus wrote: RHF wrote: How Do They Compare For Shortwave Listening (SWL) ? Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres). http://www.universal-radio.com/catalog/sw_ant/0680.html http://www.antennasupermarket.com/EAVESDROPPER.htm http://www.durhamradio.com/s/product...at=1845&page=1 Any one using a Eavesdropper Trapped Dipole Antenna ? [ For Shortwave Listening (SWL) ] Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres). http://www.durhamradio.com/s/product...at=1845&page=1 http://www.universal-radio.com/catalog/sw_ant/3377.html http://www.alphadeltacom.com/pg1.htm Anyone used both for Shortwave Listening (SWL) ? Anyone tried them both Side-by-Side ? [ For Shortwave Listening (SWL) ] . . . . = = = On Jul 21, 2:48 pm, RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get better South American reception. dxAce Michigan USA - oriented 150/330 degrees DX Ace - Is this 150* Tip-to-Tip 330* -or- 150* & 330* perpendicular to the Sides ? ~ RHF Eavesdropper-C Trapped Dipole Antenna * Overall Length about 43 Feet (13.1 Metres).http://www.universal-radio.com/catal...http://www.ant... Any one else using a Eavesdropper Trapped Dipole Antenna ? Or for that matter an Alpha Delta DX-Ultra Shortwave Antenna ? * Overall Length about 80 Feet (25 Metres).http://www.durhamradio.com/s/product...5&cat=1845&pag... Anyone used both ? Anyone tried them both Side-by-Side ? . . . . I have both an Eavesdropper and a DX Ultra. The Eavesdropper is setup in an inverted V configuration and is virtually omnidirectional. It's got a small footprint. Takes up little real estate. It's also very quiet. The DX Ultra is very large. And correctly set up according to A-D recommendations, it's also very tall, and visible over the second story of my house. Both need to be erected far from the house, to eliminate noise sources. DX Ultra is very sensitive. Not quite as quiet as the Eavesdropper....likely due more to the smaller capture area of the Eavesdropper than anything else. The DX Ultra also has a lower practical frequency limit than the Eavesdropper. Although you don't really notice it so much on MW because of the huge powers at play. I've been able to overload my receivers on the DX Ultra, but not the Eavesdropper. If you have the real estate, the DX Ultra is the better choice for most listening. If not, the Eavesdropper is fine.- Hide quoted text - - Show quoted text - DPM - Thank You for the Interesting and Informative personal assessment of both of these high quality Shortwave Radio Listening (SWL) Antennas. Any other Eavesdropper Trapped Dipole Antenna or Alpha Delta DX-Ultra Shortwave Antenna owner users out-there with comments of info ? -cause- i want to know - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - OK - So here is another Question : Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF . . . .- Hide quoted text - - Show quoted text - The Question is still out there . . . Anyone care to venture and Answer ? OK - So here is another Question : Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 26, 12:59 am, RHF wrote:
The Question is still out there . . . Anyone care to venture and Answer ? I will try, but the answer is simplistic (probably overly so) and could well be wrong-o. Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF My guess, and this is because the antenna remains connected at the center (as opposed to two slopers which would presumably have no inherent electrical connection) is that it would function more as No. 1. However, because the configuration would force the antenna to be mounted at an angle, I suspect that the reception pattern would be askew, not only horizontally but vertically as well. The side lobes would likely aim upward on the side facing into the yard, and downward on the side aiming outward from the corner. If you want to get skywave from the direction of the yard, that could be a very good thing, although I'm not sure that practically it would make a big difference. This is not all that different from what I have, although the legs on my antenna are only off 180 degrees by a fraction (maybe 10 degrees) rather than at right angles. Bruce Jensen |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 26, 7:37 am, bpnjensen wrote:
On Jul 26, 12:59 am, RHF wrote: The Question is still out there . . . Anyone care to venture and Answer ? I will try, but the answer is simplistic (probably overly so) and could well be wrong-o. Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF My guess, and this is because the antenna remains connected at the center (as opposed to two slopers which would presumably have no inherent electrical connection) is that it would function more as No. 1. However, because the configuration would force the antenna to be mounted at an angle, I suspect that the reception pattern would be askew, not only horizontally but vertically as well. The side lobes would likely aim upward on the side facing into the yard, and downward on the side aiming outward from the corner. If you want to get skywave from the direction of the yard, that could be a very good thing, although I'm not sure that practically it would make a big difference. This is not all that different from what I have, although the legs on my antenna are only off 180 degrees by a fraction (maybe 10 degrees) rather than at right angles. Bruce Jensen BpnJ - Good Answer - I honestly don't know "if" It is Right or Wrong -but- It is a Good Answer. :o) tyvm ~ RHF |
Eavesdropper Trapped Dipole Antenna -vice- Alpha Delta DX-Ultra Shortwave Antenna
On Jul 26, 2:05 pm, bpnjensen wrote:
On Jul 26, 1:10 pm, RHF wrote: The Question is still out there . . . Anyone care to venture and Answer ? I will try, but the answer is simplistic (probably overly so) and could well be wrong-o. Given a small urban-suburban Lot with Limited Space. Mounting one of these two Dipoles with the Center at the Corner of the Lot with each of the Arms extended alone adjacent sides {Right Angle} and Sloping down. Would this Antenna now function more or less like : 1 - A single Inverted "V" Dipole Antenna ? 2 - Two Sloper Antennas set at Right-Angles to each other ? What would your choice be # 1 or # 2 ? pondering the imponderable - iane ~ RHF My guess, and this is because the antenna remains connected at the center (as opposed to two slopers which would presumably have no inherent electrical connection) is that it would function more as No. 1. However, because the configuration would force the antenna to be mounted at an angle, I suspect that the reception pattern would be askew, not only horizontally but vertically as well. The side lobes would likely aim upward on the side facing into the yard, and downward on the side aiming outward from the corner. If you want to get skywave from the direction of the yard, that could be a very good thing, although I'm not sure that practically it would make a big difference. This is not all that different from what I have, although the legs on my antenna are only off 180 degrees by a fraction (maybe 10 degrees) rather than at right angles. Bruce Jensen BpnJ - Good Answer - I honestly don't know "if" It is Right or Wrong -but- It is a Good Answer. :o) tyvm ~ RHF - Glad you like it! Something else I thought of... - just thinkin' out loud here... - One more thing to consider is that (at least as I understand it), - when portions of your antenna slope, either as a sloper or as - an inverted V, you get some lobing off the upward sides of the - slopes as well, so that overall your antenna winds up being - more omnidirectional - or at least has lobes in more directions - than just broadside. BpnJ, You are right - A Dipole Antenna only functions as a Dipole when it is 'cut' to size and 'mounted' at the right Height and 'rigged' Flat. Then it is usually consider lossy Off-the-Ends and best Off-the-Sides. When notheing else changes except 'reducing' the Height of the Ends : Then the Arms of the Dipole have a Negative {Down} Slope toward the Ends -and- the reception Off-the-Ends improves. As the Slope increases and the Apex Angle goes from 180* {Flat} to 120* {30* Slope} to 90* {45* Slope} the Dipole goes from what is consider a Bi-Directional Antenna to an Omni-Directional Antenna. - In this regard, an Inverted V dipole may not be so - different from two slopers mounted back to back - and either harnessed or phased...so, although the - system you describe may electrically be more like - No. 1, the two may not be all that different from one - another in practice. Yes to my way of think taken together both would perfrom about the same. But the key thing as you correctly point out is that Electrically it is still wired as a Dipole with a Common Feed-in-Line and that is why it is not Two Slopers -because- If it were you would be able to select one or the other or both and use them as two independent Antennas. Especially when they are Rigged in a Corner at 90*. SO - My Conclusion After Thinking About It Is : A Corner Rigged Dipole Antenna was Don't Waste the Time -and- Instead install a Pair of Flat Wires or Slopers with two separate Feed-in-Lines so that you could get the benefit of each Antenna's use independently. - Now, if you take that and bend it 90 degrees - horizintally in the middle...well, I can't say that - I know for certain. It would be fun to see a - measured lobe pattern for these configs, - especially when many people in this situation - might want to give it a try. - BJ The so-called 'half-a-swastika' shaped Dipole Antenna is usually executed Across a Diagonal {Two Corners} and along the sides of a small piece of property : So the Bend is 45* and it looks like a "Z" when viewed from the top. - - - It requires 4-Support Points and for the effort a Loop Antenna could be the better choice. ~ RHF |
Eavesdropper Dipole
On Jul 21, 1:25 pm, dxAce wrote:
I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get betterSouthAmerican reception. dxAce Michigan USA DX Ace, How Long is the Length of your Coax Cable run for this Eavesdropper Dipole Antenna into the House ? What is your Eavesdropper Dipole Antenna's Mounting Height at the Center and the Tips ? Did you consider to Eavesdropper Dipole Antenna with the 72 Ohm Balanced feed-in-line when buying it back in the 1990s ? iwtk ~ RHF |
Eavesdropper Dipole
RHF wrote: On Jul 21, 1:25 pm, dxAce wrote: I finally got my old Eavesdropper dipole antenna up in the air again in preparation for the 2007/2008 DX season. I've not had it installed since about 1990 or so. Seemed to be OK in preliminary tests. Tomorrow, I'll try to finish the coax installation into the house. I have it oriented 150/330 degrees, main interest was to hopefully get betterSouthAmerican reception. DX Ace, How Long is the Length of your Coax Cable run for this Eavesdropper Dipole Antenna into the House ? Around 60' or so. What is your Eavesdropper Dipole Antenna's Mounting Height at the Center and the Tips ? Only about 16', which is 7' higher than my other antennas. Did you consider to Eavesdropper Dipole Antenna with the 72 Ohm Balanced feed-in-line when buying it back in the 1990s ? My first Eavesdropper had the 72 Ohm feed back in the 80's. |
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