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VK3ABK > TECH 14.04.07 09:51l 42 Lines 1704 Bytes #999 (0) @ WW
BID : 54584_VK3HEG
Read: DL1BAH GUEST OE7FMI
Subj: Re: Pawsey Stub and Coax Balun.
Path: DB0FHN<DB0FOR<DB0SIF<DB0MRW<OK0PKL<DB0GRL<SR6BBA<SR1BSZ<SP7MGD<CE8FGC<
VK6HGR<VK4TRS<VK3HEG
Sent: 070414/0733Z @:VK3HEG.#WEV.VIC.AUS.OC #:54584 [Ballarat] $:54584_VK3HEG
From: VK3ABK@VK3HEG.#WEV.VIC.AUS.OC
To : TECH@WW
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 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."
By the way, it may be of interest to say that Joseph Pawsey was an Australian
physisist who worked in Australia for the CSIRO (Commonwealth Scientific and
Industrial Research Organization) during WW2. He had worked in England on
in Radar and Radio Physics, and "...transmission lines and aerials for EMI
television". At CSIRO he was a group leader working in radar and radiophysics
with an interest in the work of Karl Jansky and Grote Reber, both pioneers in
detecting radiation from the 'Milky Way' galaxy. (From 'Fields of Discovery'
- Australia's CSIRO).
Something old that keeps coming back to interest us!
73. Dick. VK3ABK.
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