[amsat-bb] Re: AMSAT-BB Digest, Vol 2, Issue 504

Graham Shirville g.shirville at btinternet.com
Tue Aug 14 03:52:01 PDT 2007

And my solution has been to use a "splitter" (also known as duplexers or 
diplexers) designed to work with a dual band antenna. The common goes to the 
antenna, the UHF connection to the UHF rig and the VHF to a small dummy 
load... it always seem to work here... Most are listed under the Diamond 
brand name.

good luck

Graham G3VZV

----- Original Message ----- 
From: <richard at g3rwl.demon.co.uk>
To: <amsat-bb at amsat.org>
Sent: Tuesday, August 14, 2007 9:32 AM
Subject: [amsat-bb] Re: AMSAT-BB Digest, Vol 2, Issue 504

> Scott
>> The other downside is that even with two transceivers, I'm unable to work
>> full-duplex. The two bands on the antenna use seperate elements and feed
>> points, but share a boom. Transmitting on 2m completely overloads the
>> front-end of the IC-7000. While full duplex would be useful, it's not
>> absolutely necessary.
> Theres also the old fashioned stub, you put a 2m quarter-wave open-circuit 
> stub on the 70cm feeder close to the input of the preamp (maybe another 
> close to the input of the rig). A little bit tricky to tune (fabricate it 
> long and snip tiny bits of it off until you get maximum attenuation).
> 73
> Richard G3RWL
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