[amsat-bb] Duplexer to Dual-Band Vertical

[Mike Thompson]

It’s not ideal, but there are plenty of worse things that one can do. Last
time I tested some off the shelf diplexers on my former employer’s VNA, I
found them to have 80-90db of isolation. That’s not bad.

On Tue, Feb 11, 2020 at 7:08 AM VA3ASE via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> Good morning,
>
> I was chatting with a friend about his experimentation with amateur
> satellites and have been pondering if his setup is "safe" for his radio. He
> is running an FT-847 through a duplexer (diplexer if you want to be
> pedantic) and into a dual-band vertical base antenna on his roof.
> Definitely not an ideal setup, but meant to be temporary until time and
> better weather allow. He has managed to make some FM contacts on AO-92 with
> it.
>
> My concern is him using a duplexer in this manner while running full
> duplex. I suppose this is similar to what people must do if using an Elk
> antenna. I just worry about there being enough isolation between the ports
> and damaging his transceiver. Are there others using similar setups or is
> this something to avoid?
>
> 73,
> Alex VA3ASE
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