[amsat-bb] Best HT for satellite operation?

[Mike Diehl]

You may also want to consider adjusting your power level. SO-50 can be worked with very little power and this may help with your desense. 

73

Mike Diehl - AI6GS 

> On Mar 10, 2017, at 10:23 AM, Paul Stoetzer <n8hm at arrl.net> wrote:
> 
> 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.
> 
> 73,
> 
> Paul, N8HM
> 
>> 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
>> harmonic?
>> 
>> 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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>> _______________________________________________
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>> expressed
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb