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@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@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@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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Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb