Re: [amsat-bb] Minimizing de-sense on Arrow and other closely spaced antennas

["Bill Acito" <w1pa@xxxxxxxxxxx>]

I just picked up a used FT-530, but for mobile/portable, I also have the
Alinco twins (DR-135, DR-435) available, so the answer is "both". :-)

Bill
W1PA
----- Original Message -----
From: "Howard Long" <howard@howardlong.com>
To: "Bill Acito" <w1pa@hotmail.com>; <amsat-bb@AMSAT.Org>
Sent: Friday, October 11, 2002 9:50 AM
Subject: RE: [amsat-bb] Minimizing de-sense on Arrow and other closely
spaced antennas


> Hello Bill
>
> > Considering a set-up like many of you have used for portable work on
the
> > LEO's (an Arrow antenna, and a dual band HT), what causes the
de-sense
> > on the 70cm side during transmit: the 2m power in close proximity,
or
> > the third harmonic, 3 MHz away (using UO-14 as an example)?
>
> I've been pondering this one. Normally the problem pervades when you
use two
> different radios, one for the uplink, the other for the downlink.
>
> However, you're using a purpose built, dual band full-duplex HT. My
> experience with these units is that unless you're right on the 3rd
harmonic,
> the built in filters do enough to allow RX on 70cm while TXing on 2m -
after
> all, they're designed and marketed to do that, right?
>
> I wonder which radio you're using?
>
> Sorry to answer a question with a question... ;-)
>
> Howard G6LVB
>

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