[amsat-bb] Diplexer, Arrow ant, 2 handhelds question

[Don KB2YSI]

I use this setup but I have the common port of the duplexer attached to the
radio and the 2m port goes to the antenna. The second radio connects
directly to the 70cm part of the Arrow.

That being said, my IC7100 will cause desense during TX on some RX
frequencies for SO-50 on my TH-D74A. The Btech UV-5X3 or TH-D72 do not
cause desense when I use them for TX.

On Tue, Mar 26, 2019, 12:24 <skristof at etczone.com> wrote:

> Today, on the SO-50 pass, I tried using the Arrow diplexer (duplexer?)
> to enable full-duplex using two handhelds. As most on this forum know,
> if you use two handhelds with the Arrow antenna, the third harmonic of
> the 2m uplink will desense the 70cm handheld, so you can't hear
> yourself.
>
> So, I hooked up what is normally the antenna end of the diplexer to the
> 2m uplink radio and the 2m radio end of the diplexer to the 2m part of
> the Arrow antenna. My hope was that this would suppress the third
> harmonic of the 2m uplink enough so that it wouldn't desense the 70cm
> handheld. The 70cm radio end of the diplexer was left unconnected.
>
> It didn't seem to work. I made contacts but I still didn't hear myself
> on 70cm.
>
> Just wondering if anyone else has tried this and what results you got.
>
> Steve AI9IN
>
> EM79ji
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