Doug,
FWIW, I with great success and little fanfare made a shortened loop
antenna for 80 & 160. I followed the info in the Antenna handbook and
it was a large version of the AEA Isoloop. AEA didn't invent it, just
the specifics for their isoloop.
I ran 1.5KW through my shortened loop and it was a perfect 1:1
I know you're talking receiving but why not make one antenna do both?
You'll need a vacum Variable rated at around 15KV and whatever remote
tuning you want to use be it stepper or servos such as I used. The
servos were strong enough to adjust the vac variable and at the end
of travel I could feel the screw tighten or break free; either worked
just fine and I never had to take the travel to that extreme anyway.
The outdoor part was hermetically sealed in a plastic mailbox.
The incredibly high Q of the antenna helped remove QRM and indeed,
you're tuning the antenna with the cap, not the feedline. Literature
said the efficiency is I believe 95% of that of a dipole at the same
frequency. On 80 meters I had about a 5 kHz bandwidth and on 160 it
was about three Khz. You just adjust via the reciever and when you
hear the QRN the loudest, you're dead on frequency.
I worked most of the 160M DXCC credits I have on that antenna & the
two amps it was hooked up with was a Heathkit 220 and an Alpha 77SX.
If that antenna can handle that Alpha, it can handle anything...
Not a have to, but it's a very viable answer to having one antenna do
both.
Gary
ka1j
> Gentlemen,
> I have looked at the archives and am unable to find a
definitive
> answer
> to this one. Perhaps I need to do a better search but maybe someone
> can advise me. I presently use an inverted vee on 160M for
> transmitting and reception but am completing the loop receive antenna
> from "DXing on the Edge". This antenna is five foot square and will
> be used for my receive antenna. I normally operate QSK and want to
> be able to run 400W output on CW. Can I just plug the magnetic
> receiving loop antenna into the RX ant socket and set the main Main RX
> to use this antenna while transmitting on ANT1 which will have the
> inverted vee attached? Have any of you tried this with the O2?
> Any advice is much appreciated.
>
> 73 Doug EI2CN
>
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