Jim,
Looking over the article, I now see that I didn't elaborate on why none of these HTs were suitable for full-duplex operation on V/U FM satellites like SO-50 and LilacSat-2. It's a simple reason, unfortunately: the 2m transmitter in these radios desenses the 70cm receiver, when trying to hear the weak downlinks from our satellites. These radios are fine for full-duplex when transmitting on 2m, if the 70cm signal is much stronger than our satellite downlinks. Unfortunately, that's not what we have at this time. It doesn't matter which antenna you use with these radios, and whether or not you have diplexers connected to the HT.
Using another HT with one of the Chinese-made HTs I mention in the article would be one way to have a full-duplex station to work V/U FM satellites like our current SO-50 and (when it is active) LilacSat-2. SO-50's downlink in particular is a tough one for these radios, as the 436.795 MHz (+/-) frequency is only a few hundred kHz above the 3rd harmonic of the 145.850 MHz uplink. Many 2m/70cm FM mobile transceivers can handle this, but only TH-D72A in terms of HTs in current (for now) production.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK
On Thu, Sep 22, 2016 at 1:46 AM, James Austin ka2rvo@gmail.com wrote:
What was the problem with the Chinese HT's working full duplex in the V/U modes. I don't recall that being mentioned in the article.
Jim/KA2RVO