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long wire antenna question
a quick question...newbie to HF so please be gentle.
a 25 mtr wire to go into a 12 ( ish ) mtr garden. Is it possible to double the wire back on itself so it extends out 12 & half mtrs then loops round and back up 12 & half mtrs ? just been told this is perfectly acceptable ( it's the wire length that's important rather than how it's installed ) but i seem think i've been told this is a no no. would the above installation effect performance ? looking forward to advice -- ************************************************** ************************************************** ******************* i want to die peacefully in my sleep , same as my grandad - not like his passengers,all screaming and shouting ************************************************** ************************************************** ******************* |
lethal wrote:
a quick question...newbie to HF so please be gentle. a 25 mtr wire to go into a 12 ( ish ) mtr garden. Is it possible to double the wire back on itself so it extends out 12 & half mtrs then loops round and back up 12 & half mtrs ? just been told this is perfectly acceptable ( it's the wire length that's important rather than how it's installed ) but i seem think i've been told this is a no no. would the above installation effect performance ? looking forward to advice Bends should not be less than 90deg or the wires will tend to cancel out.... End fed might not be the best option, what do you want to listen to? -- Robert Maskill G4PYR Peterborough Cambridgeshire www.coastalradio.greater-peterborough.com |
lethal ...
^ a 25 mtr wire to go into a 12 ( ish ) mtr garden. Heed Robert Maskill's message. If your garden permits, have the wire slope upward at an angle so that the horizontal distance is less than 12 ( ish ) mtr. Frank |
Bends should not be less than 90deg or the wires will tend to cancel out....
Do you mean :bends should not be MORE than 90 degrees...? |
Hi Rob,
half the problem i have is that i've no knowledge about long wires so this is all new territory. my garden is just a general rectangular shape but just not too long. End fed is an easier installation as i can come out of the loft with the feed then straight onto the supports....this would then give me decent height for the wire. I'm going to put up a pole the other end of the garden. I'm planning on general SWL. No particular freq. I'm all for experimenting with numerous combinations etc but for now. i just want to get it all up and running , test the water so to speak then take it from there. thanks for replying anyway. Any other contributions gratefully received regards Simon -- ************************************************** ************************************************** ******************* i want to die peacefully in my sleep , same as my grandad - not like his passengers,all screaming and shouting ************************************************** ************************************************** ******************* "Robert Maskill" wrote in message ... lethal wrote: a quick question...newbie to HF so please be gentle. a 25 mtr wire to go into a 12 ( ish ) mtr garden. Is it possible to double the wire back on itself so it extends out 12 & half mtrs then loops round and back up 12 & half mtrs ? just been told this is perfectly acceptable ( it's the wire length that's important rather than how it's installed ) but i seem think i've been told this is a no no. would the above installation effect performance ? looking forward to advice Bends should not be less than 90deg or the wires will tend to cancel out.... End fed might not be the best option, what do you want to listen to? -- Robert Maskill G4PYR Peterborough Cambridgeshire www.coastalradio.greater-peterborough.com |
TMartin831 ...
^ Bends should not be less than 90deg or the wires will tend to ^ cancel out.... ^ ^ Do you mean :bends should not be MORE than 90 degrees...? The angle that is a result of the bend should not be less than 90 degrees, with the wire constituting both sides of the angle. Electrically, the signal should not make a turn greater than 90 degrees. Frank |
lethal wrote:
Hi Rob, half the problem i have is that i've no knowledge about long wires so this is all new territory. my garden is just a general rectangular shape but just not too long. End fed is an easier installation as i can come out of the loft with the feed then straight onto the supports....this would then give me decent height for the wire. I'm going to put up a pole the other end of the garden. I'm planning on general SWL. No particular freq. I'm all for experimenting with numerous combinations etc but for now. i just want to get it all up and running , test the water so to speak then take it from there. thanks for replying anyway. Any other contributions gratefully received regards Simon My advice then is put up as much as you can, but don't make any bend greater than 90deg I have 1 130ft end fed up here with a loading coil on the end which I use on 1.8MHz for transmitting, tuned against an earth. That works very well. It's over the house and round 3 sides of the garden. Have a play and experiment, that's part of the enjoyment.... -- Robert Maskill G4PYR Peterborough Cambridgeshire www.coastalradio.greater-peterborough.com |
"Brian Gregory [UK]" wrote in message
... Just use the longest length you can without the wire turning back on itself. A right angle in the aerial is fine but if it turns back on itself you are unlikely to get any benifit from the extra length. I should add the that - not only are you unlikely to get any benifit but it'll probably be less effective on most frequencies. -- Brian Gregory (In the UK). |
You may want to add an antenna tuner to the long wire ,I fully understand that this is a RECEIVE
ONLY application. The tuner will help even when just receiving! Here's a source http://search.netscape.com/ns/boomframe.jsp?query=MFJ+tuners&page=1&offset=0&res ult_url=redir%3Fsrc%3Dwebsearch%26amp%3BrequestId% 3D7e7f6f064acb4cd7%26amp%3BclickedItemRank%3D7%26a mp%3BuserQuery%3DMFJ%2Btuners%26amp%3BclickedItemU RN%3Dhttp%253A%252F%252Fwww.mfjenterprises.com%252 F%26amp%3BinvocationType%3D-%26amp%3BfromPage%3DNSCPSuggestion&remove_url=http %3A%2F%2Fwww.mfjenterprises.com%2F Jim lethal wrote: a quick question...newbie to HF so please be gentle. a 25 mtr wire to go into a 12 ( ish ) mtr garden. Is it possible to double the wire back on itself so it extends out 12 & half mtrs then loops round and back up 12 & half mtrs ? just been told this is perfectly acceptable ( it's the wire length that's important rather than how it's installed ) but i seem think i've been told this is a no no. would the above installation effect performance ? looking forward to advice -- ************************************************** ************************************************** ******************* i want to die peacefully in my sleep , same as my grandad - not like his passengers,all screaming and shouting ************************************************** ************************************************** ******************* |
Jim Mac Donald ...
^ You may want to add an antenna tuner to the long wire ,I fully ^ understand that this is a RECEIVE ONLY application. The tuner ^ will help even when just receiving! Here's a source The lowest priced tuner there is $80! I doubt that the little improvement you get will be worth that much. Frank |
"Frank" wrote in message
news:01c3e1c3$47fa8aa0$0125250a@noylptghgnznzstp.. . Jim Mac Donald ... ^ You may want to add an antenna tuner to the long wire ,I fully ^ understand that this is a RECEIVE ONLY application. The tuner ^ will help even when just receiving! Here's a source The lowest priced tuner there is $80! I doubt that the little improvement you get will be worth that much. Frank Depends on how much you are willing to spend. Personally I have antennas up for most bands that I want to listen to - however I did notice a big difference in signal strength when I tuned up my 40m dipole on 15 metres versus using the 40m antenna without the tuner - signal strength was significantly better (around the 4-5 "S" points higher). Same thing when I tuned up my 10 metre vertical for 15m. I have just about exhausted all room for antennas on my block, so as I cannot put any more up, a tuner will likely be the only way to go Guess that it depends on whether you want to hear the lower down signals or not. Matt |
i use an antenna tuner with all my radios and i find that on some bands you
get little to no improvement and on other bands you can get 3 or 4 "s" points of improvement. if you want to make one just go to radio havana cuba's website and look in arnie corro's section and he has all the plans for building one or two different antenna tuners. chuck "Matt" wrote in message ... "Frank" wrote in message news:01c3e1c3$47fa8aa0$0125250a@noylptghgnznzstp.. . Jim Mac Donald ... ^ You may want to add an antenna tuner to the long wire ,I fully ^ understand that this is a RECEIVE ONLY application. The tuner ^ will help even when just receiving! Here's a source The lowest priced tuner there is $80! I doubt that the little improvement you get will be worth that much. Frank Depends on how much you are willing to spend. Personally I have antennas up for most bands that I want to listen to - however I did notice a big difference in signal strength when I tuned up my 40m dipole on 15 metres versus using the 40m antenna without the tuner - signal strength was significantly better (around the 4-5 "S" points higher). Same thing when I tuned up my 10 metre vertical for 15m. I have just about exhausted all room for antennas on my block, so as I cannot put any more up, a tuner will likely be the only way to go Guess that it depends on whether you want to hear the lower down signals or not. Matt |
You can also find plains and construction ideas in the ARRL handbook and
other Ham publications, available at many public libraries. The real trick of building a antenna tuner is finding the variable capacitor and large coil for this circuit. Jim "c.foster" wrote: i use an antenna tuner with all my radios and i find that on some bands you get little to no improvement and on other bands you can get 3 or 4 "s" points of improvement. if you want to make one just go to radio havana cuba's website and look in arnie corro's section and he has all the plans for building one or two different antenna tuners. chuck "Matt" wrote in message ... "Frank" wrote in message news:01c3e1c3$47fa8aa0$0125250a@noylptghgnznzstp.. . Jim Mac Donald ... ^ You may want to add an antenna tuner to the long wire ,I fully ^ understand that this is a RECEIVE ONLY application. The tuner ^ will help even when just receiving! Here's a source The lowest priced tuner there is $80! I doubt that the little improvement you get will be worth that much. Frank Depends on how much you are willing to spend. Personally I have antennas up for most bands that I want to listen to - however I did notice a big difference in signal strength when I tuned up my 40m dipole on 15 metres versus using the 40m antenna without the tuner - signal strength was significantly better (around the 4-5 "S" points higher). Same thing when I tuned up my 10 metre vertical for 15m. I have just about exhausted all room for antennas on my block, so as I cannot put any more up, a tuner will likely be the only way to go Guess that it depends on whether you want to hear the lower down signals or not. Matt |
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