[amsat-bb] AO-85 and Puxing PX-UV973, full-duplex - report (not so long)

Patrick STODDARD (WD9EWK/VA7EWK) amsat-bb at wd9ewk.net
Sat Nov 28 16:05:34 UTC 2015

Hi Skyler!

As I have been writing, these Chinese-made HTs can work
AO-85 full-duplex. They aren't able to do that with SO-50
or LilacSat-2, due to the 2m transmitter desensing the
70cm receiver. As I also wrote last night, the Kenwood
TH-D72A (not an "American" radio; it's made in Japan) does
better than the KG-UV9D, but for AO-85 you could go with
either radio. One advantage with the KG-UV9D is its price -
less than $200 at most stores, compared with over $400 for
the TH-D72A.

If you want to hear how I was hearing AO-85 with each of
those radios, go back through my posts and visit my
Dropbox space. Look for the MP3 files in each folder. That
recording came from whatever radio I was using to work the
pass. I put an audio splitter into the HT's speaker jack,
and then fed audio to a small recorder and an earpiece.
I wanted to have a record of what the radio heard, along
with what a separate receiver (my SDR setup) heard from
the satellite. You can play back those large WAV files if
you download software like HDSDR, even if you don't have
an SDR receiver or dongle.

For SO-50 and LilacSat-2, you could use the radio you
already have to transmit to those satellites, and a KG-UV9D
as the receiver, to make a full-duplex station for those
two satellites. You could also program a group of memory
channels for each of these satellites, but full-duplex
operation is the way to go.


Twitter: @WD9EWK

On Sat, Nov 28, 2015 at 10:56 AM, Skyler Fennell <electricity440 at gmail.com>

> Thanks for that information.
> I am looking into the woxun radios, and see the kv9d at the top of your
> rank.
> Is this an adequate radio for full duplex satellite operation, how far
> does it fall behind the American radios?
> 73
> Skyler kd0whb

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