[amsat-bb] Handheld for LEO satellites?

[David G0MRF]

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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