Thanks for the Great input! I'm gonna give the FAR circuit a try!
Thanks and 73,
> From: firstname.lastname@example.org
> To: email@example.com
> Subject: Re: Topband: k9ay Loop relay box?
> Date: Wed, 15 Feb 2012 11:03:40 +0000
> Hi Dan,
> Not too difficult construction or critical components. Switched 12 (or 24)
> volt psu, and virtually any two double change-over (12 or 24v) relays in the
> remote box, with their associated matching transformer, chokes, capacitors
> The small 12v mains transformer cost approx $1.50 and the relays 1$ each. A
> few capacitors and 100uH chokes. Most of this you should be able to pick up
> at a hamfest.
> I built one for a friend, using Gary's original article, similar to link
> above. Photos attached, you can zoom up and see exactly how it is wired.
> (sorry, not my prettiest construction).
> The only major difference from Gary's circuit was that, if I remember
> correctly, I used a binocular ferrite (1:9 for 50 ohm coax, 1:6 for 75 ohm
> coax) matching transformer in the remote box rather than an autotransformer
> to reduce any possible common-mode feeder pickup, but this was not strictly
> necessary. I could have simply wound 20 or so turns of thin coax in a
> FT240-31 and patched it into his feeder close to the box which also would
> have blocked any common-mode.
> Also I have built the Far-Circuits kit, which is two pcbs including a
> W7IUV-type preamp and 160m hpf for rejecting BC birdies, but never completed
> it because it still needs mounting in the boxes and home-brew psu switching,
> and seemed over complicated for the purpose (the switching design and kit
> was not included with mine). I think it works OK though, particularly if you
> need the extra gain, perhaps others who have it working will advise you.
> Usually, extra preamplification at a K9AY is not needed on 160m.. The other
> difference between this kit and Gary's original design is that Gary's just
> power-feeds the switching voltages down the coax centre, whereas the
> Far-Circuits design uses a multicore cable.
> Good luck with the project.
> John G3PQA
> -----Original Message-----
> From: Daniel Hileman
> Sent: Wednesday, February 15, 2012 12:38 AM
> To: firstname.lastname@example.org
> Subject: Topband: k9ay Loop relay box?
> Hi...I am interested in building a set of K9AY Loops, but those relay boxes
> are expensive to BUY! Anyone know of source of a kit? Or, anyone in the
> Dallas area want to get together and help a newbie to building circuits, etc
> build one?
> Thanks and 73,
> Dan N9WX
> UR RST IS ... ... ..9 QSB QSB - hw? BK
UR RST IS ... ... ..9 QSB QSB - hw? BK