Thanks for the feedback, David! My "plan B" is to try the duplexer on the UHF receive side, if plan A doesn't work. I'm probably out of plans after that, at least for a while.
Steve AI9IN
----- Original Message ----- From: "David G0MRF via AMSAT-BB" amsat-bb@amsat.org To: skristof@etczone.net; amsat-bb@amsat.org Sent: Saturday, July 11, 2015 1:33 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Sounds like a good plan Steve.
My only thoughts are:
- You may lose some power through the duplexer. I recall they can be
quite lossy. 2) The desense on UHF may be 3rd harmonic. In which case the duplexer or a low pass filter will be OK in the 2m side. But.. 3) The 'desense' may be due to the UHF radio input being unfiltered...In which case it is 2m overload. In that case you need a high pass filter on the UHF radio input.
I really hope it isn't the same as my ICOM 706G which transmits phase noise everywhere. - No cure for that !
Good luck.
David
-----Original Message----- From: Steve Kristoff skristof@etczone.net To: amsat-bb bb amsat-bb@amsat.org Sent: Sat, 11 Jul 2015 18:22 Subject: Re: [amsat-bb] Handheld for LEO satellites?
I ended up getting two Baofeng UV82R HTs. They work fine, but they have the
same problem of the UHF radio desensing when I transmit with the VHF. So,
not full duplex. I did just buy the Arrow Duplexer to go with my Arrow Antenna. My plan is to still use two radios and just use the duplexer on the VHF uplink side to see if it kills the third harmonic enough to prevent desensing of the UHF radio. I can give a report after I try it. If anyone sees a problem in my plan, please speak up soon before I fry something. Thank you!
Steve AI9IN
----- Original Message ----- From: "Dennis Griffin" kd7cac@gmail.com To: "Paul Stoetzer" n8hm@arrl.net Cc: "amsat-bb bb" amsat-bb@amsat.org Sent: Saturday, July 11, 2015 12:37 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense
might be mitigated by using an Arrow dual
band yagi with duplexer?
TIA
& 73 de Dennis KD7CAC
Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM,
Paul Stoetzer n8hm@arrl.net wrote:
If you transmit on VHF, it will
desense on UHF and you won't be able to
hear yourself on SO-50, negating the
purpose of being full-duplex.
It might be OK for satellites with a UHF
uplink and a VHF downlink, but
that remains to be seen. The same thing
applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed,
Jan 21, 2015 at 2:43 PM, Steve Kristoff skristof@etczone.com
wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have
thoughts
on that radio?
Steve AI9IN
skristof@etczone.com
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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
Steve Kristoff skristof@etczone.com
"A few chords strummed on a ukulele, enough to please a few others beside yourself, does more good in this world than the combined efforts of all the financiers and politicians that ever lived." - Frank Littig, Littig's New Harmony Self Instructor Chords for Ukulele, Banjuke or Taro Patch Fiddle, Chart Music Publishing House, Chicago, Illinois, 1924