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ZL3AI > INFO 07.08.02 11:41l 43 Lines 1571 Bytes #999 (0) @ WW
BID : ZL3AI152
Read: DB0FHN GUEST
Subj: Re^2: Buried Antenna
Path: DB0FHN<DB0ZWI<DB0HDF<DB0ERF<DB0MRW<OK0PPL<RZ6HXA<SP7MGD<WB0TAX<HA3PG<
VK3AVE<ZL2BAU<ZL3VML
Sent: 020806/2129Z @:ZL3VML.#80.NZL.OC #:41039 [Chch-NZ] FBB7.00i $:ZL3AI152
From: ZL3AI@ZL3VML.#80.NZL.OC
To : INFO@WW
>From: G4UGR@GB7CRV.#16.GBR.EU
>To : INFO@WWW
>
>
>Hello All,
>In his book "Practical Wire Antennas", John D Heys G3BDQ describes an
>underground antenna developed by CH Targett G6PG around 1927. The antenna
>consisted of 60 feet of rubber insulated wire buried 2.5 feet below
>ground. The wire was supported on insulated posts and protected by pan
>tiles before the trench was filled in.
>
>G6PG discovered that the antenna reduced QRN to almost zero and received
>short wave signals almost as efficiently as his elevated wire. His 8W Tx
>was fed to the antenna on wavelengths of 150-200m, 90m, and 45m. He had
>many contacts up to a range of 1000 miles. The antenna was very
>directional all the stations worked lay within an angle of 30 degrees from
>its far end.
>
>He describes other designs of underground antennas, and suggests that the
>military are experimenting with this idea to perfect the invisible
>antenna.
>
>So underground antennas are not such a daft idea after all!
>
>73, Tom G4UGR
Hi Tom et al,
Once upon a time, in the late 1960's, I was a CB operator. One of the locals
played a prank on another local by giving him plans of an underground aerial
for the CB band (26.5 MHz here in New Zealand).
From memory, it was something like an end-fed halfwave of wire inside about 4
or 6 inch diameter PVC pipe and buried underground horizontally.
The rest of us sniggered....but the victim claimed that it worked!
73, David.
T4 1.5à24
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