Re: Underground Antenna Experiments on 160 meters.


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

Hi Reg, Interesting, but isn't a 30 metre wire more like 100 feet
instead of 60 feet? According to the conversions on your programs it
is. Did you ever try burying your counterpoise and elevating the
buried aluminum wire to see how the results compare?
Gary N4AST

.

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