[amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink

Alan wa4sca at gmail.com
Mon Jan 20 16:19:47 PST 2014


Just for fun I swept the mode-J filter with an analyzer.  The isolation was good enough that it didn't
matter with the 2 meter side was terminated or not.



<-----Original Message-----
<From: amsat-bb-bounces at amsat.org 
<[mailto:amsat-bb-bounces at amsat.org] On Behalf Of Vince Fiscus, KB7ADL
<Sent: Monday, January 20, 2014 4:06 PM
<To: amsat-bb at amsat.org
<Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink
<At 07:09 PM 1/19/2014 +0000, Jim Jerzycke <kq6ea at verizon.net> wrote:
<>Buy a diplexer, and connect it as shown in the linked article:
<>I also tilt both of my Yagis so they're 45* to the boom, 
<which makes them 
<>90* to each other.
<>Yes, I lose some signal on terrestrial use, but ti helped cut the 
<>coupling, and desense, down quite a bit.
<>73, Jim  KQ6EA
<One thing I've always wondered about this is, would one what to
<put a 50 ohm non inductive resister on the 2M output of the
<diplexer? or shouldn't that make much difference.
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