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VK2TV > TECH 15.04.07 00:58l 53 Lines 2172 Bytes #999 (0) @ WW
BID : 0A0077VK2TV
Read: GUEST OE7FMI
Subj: Re: Pawsey Stub and Coax Balun.
Path: DB0FHN<DB0FOR<DB0SIF<DB0MRW<DB0HOT<DB0ERF<DB0FBB<DB0IUZ<DB0OVN<DB0GOS<
ON0AR<I0TVL<F6CDD<F6BVP<VK2TV
Sent: 070414/2326Z @:VK2TV.#MNC.NSW.AUS.OC #:8172 [Kempsey, QF68JX] $:0A0077VK2
From: VK2TV@VK2TV.#MNC.NSW.AUS.OC
To : TECH@WW
VK3ABK wrote:-
> Hello Antenna Stubs.
>
> John, G8MNY, has re-sent a bulletin about the use of a Pawsey Stub, used > to match a balanced
antenna to an unbalanced feedline. Roger, G0CJM, has > now commented on
this, and suggests an antenna that seems to use two > Pawsey Stubs!
> This antenna, called a 'coaxial dipole' has appeared in several journals > in the past; 'Ham Radio'
(USA), and 'Amateur Radio' (Australia), are two, > maybe more.
I wrote an article for my local radio club newsletter in late 1982. The
article was picked up by the WIA and published in AR in February 1983
under the title of "A Different Dipole", using my previous callsign of
VK2BVO. The article was also published in "Break-In" in New Zealand. I
didn't claim originality for the design. I merely presented a different
view of an old design. A bit of lateral thinking.
My article described two construction methods for use at VHF and UHF.
The article was based on a HF version I saw in a old antenna book, from
memory. I can't find the book, and I can't remember the name given to the
original antenna.
I have also constructed an 80m version from RG58 coaxial cable. The
extension beyond the shorting points being made of 10/.010 hookup wire.
The entire antenna was taped to a length of small diameter rope. This
antenna was used whilst portable and I found it to be more tolerant of its
surroundings than a conventional dipole. It displayed a much flatter VSWR.
The VHF and UHF versions also displayed excellent VSWR characteristics.
> I have one such antenna beside me as I type; made for the 70cm band, and used
> as a test antenna in the shack. There has been some critisism of this antenna
> but it does match to the coax quite well. I haven't compared it's radiation.
>
> Roger Wrote....
>
> "Very similar to the coax aerials built by g6xcj in the 80s viz
>
> -------x========================|-|===============================x-------
>
> Formula:x=solder joint outer to inner.
> :|-| =feed from coax
>
> Excellent low noise aerial for literally any qrg. Use with tuner and you
> can get 1.5.1 VSWR."
Cheers .. Ray
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