[amsat-bb] Best HT for satellite operation?

skristof at etczone.com skristof at etczone.com
Fri Mar 10 18:21:53 UTC 2017

I've used two Baofengs to work SO-50, and the V transmission from one
still desenses the U reception in the other one, even though they are
two separate radios. 

Do I put low-pass filter in the transmission line to squash that third

Steve AI9IN

On 2017-03-10 12:36, Patrick STODDARD (WD9EWK/VA7EWK) wrote:

> Dale,
> As has been pointed out, there have been many HTs over the years
> that allow for cross-band full-duplex operation. This was actually
> a more common feature in the 1990s, and has gradually disappeared
> from HTs since then. A few years ago, Andrew KE5GDB had a list of
> HTs and other radios that supported cross-band full-duplex
> operation on his web site. That web page is gone, but lives on
> in the Internet Archive's Wayback Machine at:
> http://web.archive.org/web/20090724094403/http://www.
> thathamkid.com/website/ham-radio/full-duplex-radios
> For HTs, you could add the TH-D72 to this list, which came out at
> the end of 2010.
> In addition to those HTs, there are a few others that allow for
> cross-band full-duplex operation in one direction, where you are
> transmitting on 70cm and listening on 2m. I wrote a bit about
> a few of the Chinese-made HTs that are able to work AO-85 full-
> duplex in a series of posts here on the -BB in late 2015. One
> message I posted in December 2015 that had links to the other
> posts I made about those radios is available at:
> http://amsat.org/pipermail/amsat-bb/2015-December/056269.html
> The 70cm receivers in these Chinese-made HTs suffer from desense
> whenever you transmit on 2m. These radios can be programmed with
> groups of memory channels to work V/U FM satellites like SO-50
> half-duplex, or you could use the two VFOs to do that without the
> need to program memory channels.
> Using separate radios for uplink and downlink is also a good way
> to have a full-duplex setup. Many have even used a pair of the
> inexpensive Baofeng-type HTs to have a station capable of full-
> duplex operation, or one Baofeng-type radio paired with an HT from
> one of the traditional ham manufacturers.
> 73!
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
> Twitter: @WD9EWK
> On Thu, Mar 9, 2017 at 4:25 PM, Dale Kubichek via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>> Everyone wants 'full duplex', I've not seen a dual-band HT that can do
>> 'real' RX while the PTT is pushed, period!
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