[amsat-bb] Hand helds for FM birds

[Patrick STODDARD (WD9EWK/VA7EWK)]

Hi George!

Thanks to Stefan VE4NSA for referring to the QRZ.com forum
discussion I started about this radio and working SO-50,
shortly after the last Hamvention.  Rather than having to
wade through all those posts, here's a summary...

The KG-UV8D has desense when transmitting on 2m and trying
to receive SO-50's 70cm downlink.  It works better if the
70cm signals are stronger, like when using this HT as a
cross-band receiver to reach a far-off repeater.  Full-
duplex operation on SO-50 aside, the KG-UV8D's 70cm
receiver is good for receiving SO-50. Make sure to use
the 2.5 kHz tuning steps with this radio.  There are
points in SO-50 passes where the KG-UV8D won't receive
the downlink, when it appears to be in between the two
frequencies using 5 kHz tuning steps.

At the ARRL convention in July, I was able to test my
KG-UV8D with a Fox-1 prototype on display at the AMSAT
booth.  The Fox-1 prototype was using the same frequency
pair as the Fox-1A satellite - uplink on 435.180 MHz,
downlink on 145.980 MHz.  No desense issues were heard
when transmitting on 435.180 MHz and simultaneously
receiving the 145.980 MHz downlink.  It worked well, and
the radio sounded well through the prototype.  I reduced
my transmit power to 1W, and the prototype was using a
dummy load as its antennas, in an attempt to better
simulate working a satellite in orbit.

I can't wait to get our Fox-1 satellites in orbit.
Radios like the KG-UV8D, and others like the IC-W32A,
will be great for working Fox-1 satellites full-duplex.
This will be even more important, when transmitting on
70cm to Fox-1 satellites instead of 2m to SO-50.

73!





Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/



On Fri, Sep 19, 2014 at 2:04 AM, George Henry <ka3hsw at att.net> wrote:

> The new Wouxun KG-UV8D is being advertised as full-duplex.  Don't know
> whether it suffers desense or not.  I used to have a Yaesu FT-470 that
> worked quite nicely, and currently have an Alinco DJ-G5 that seems to get
> the job done just fine.
>
>
>