[amsat-bb] Handheld for LEO satellites?

[Steve Kristoff]

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 at amsat.org>
To: <skristof at etczone.net>; <amsat-bb at 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:
>
> 1) 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 at etczone.net>
> To: amsat-bb bb <amsat-bb at 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 at gmail.com>
> To: "Paul Stoetzer" <n8hm at arrl.net>
> Cc: "amsat-bb bb"
> <amsat-bb at 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 at 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 at etczone.com>
>>>
> wrote:
>>>
>>>> The Alinco DJ-G7 claims to be full-duplex capable. Anybody have
> thoughts
>>>> on
>>>> that radio?
>>>>
>>>> Steve AI9IN
>>>>
> skristof at etczone.com
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> _______________________________________________
> Sent
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> interested persons worldwide without requiring membership. Opinions
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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
> 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
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Steve Kristoff
skristof at 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 
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Harmony Self Instructor Chords for Ukulele, Banjuke or Taro Patch Fiddle, 
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