Re: Underground Antenna Experiments on 160 meters.
- From: John Ferrell <johnferrell@xxxxxxxxxxxxxx>
- Date: Fri, 29 Jul 2005 20:36:46 GMT
I agree that it was an April issue and I think my old friend W8DMR
(Bill) may have written it. However, I was thinking it more in the mid
60's.
de W8CCW
On Fri, 29 Jul 2005 12:51:56 -0700, Roy Lewallen <w7el@xxxxxxxxx>
wrote:
>I've used an antenna made of buried radial wires for many years, with a
>vertical counterpoise, and AM broadcasters have been using this
>technique for the better part of a century. Works fine. Hm, maybe I
>should add another column to the wire specification table in EZNEC so
>people can specify whether the wire is an (A)ntenna or (C)ounterpoise. . .
>
>A related antenna was described many years ago in one of the amateur
>magazines. The author explained that when we construct a vertical
>antenna, an image antenna appears in the ground. So he simply dug a hole
>in the ground in put his vertical below ground. The image antenna did
>the radiating, of course. I did a pretty thorough search of QST and
>couldn't find the article -- I'd be indebted to anyone who can recall
>where this appeared. My guess is that it was around the early '60s. In
>an April issue of course.
>
>Roy Lewallen, W7EL
>
>
>Reg Edwards wrote:
>> Some years back I buried a 30 metre (60-feet) auminium wire one spade
>> depth in my back garden. Wire was 1.5 mm in diameter. Soil
>> resistivity about 100 ohm-metres. To scientists that's 10
>> milli-Siemens. The near end of the wire came up in the shack. That's
>> under my kitchen sink. It's still there. Open-circuit at the far end.
>>
>> As a counterpoise, something essential to tune it against, I erected a
>> wire in the form of an inverted-L. This was about 30 feet high and
>> overall length about 140 feet. I chose this length because it fitted
>> nicely into my back garden. The front garden is too short even for an
>> underground antenna.
>>
>> On the 160m band I fed into it about 30 watts from a home-brew
>> transceiver so I can't provide for the record a manufacturer's type
>> and serial number. However I still have the transceiver which can be
>> inspected.
>>
>> Despite a high local noise level of S-6 I was able to communicate up
>> to 60 miles with mobile stations in broad daylight on SSB. After
>> sunset I could easily communicate with most of Europe on CW.
>>
>> I think a record of these buried antenna experiments should be kept
>> for posterity, alongside the famous biblical work of B,L & E.
>>
>> By the way, as you see, I did remember to measure soil resistivity. It
>> was the first thing I did. What buried wire do you think I used to
>> measure it?
>> ----
>> Reg, G4FGQ
>>
>>
.
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