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

["Howard Long" <howard@xxxxxxxxxxxxxx>]

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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