[amsat-bb] Best HT for satellite operation?
n8hm at arrl.net
Fri Mar 10 18:23:23 UTC 2017
That should work, though it may not be enough depending on the front end of
the other Baofeng.
You may find you need to use a receiver with a better front end to
eliminate desense, or two filters.
On Fri, Mar 10, 2017 at 1:21 PM, <skristof at etczone.com> wrote:
> 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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