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

19 Jan 2014

      Yep, been using one of those for years!
I have a Sinclair Labs unit that provides 100dB rejection outside of the 
2 Meter band.
Jim  KQ6EA
On 01/19/2014 07:32 PM, w4tas wrote:
...
I would also suggest a low pass filter on the two meter transmitter.
A diplexer will work well for this also.
This will reduce the third harmonic which is causing your problem.
Good luck,
-----Original Message----- From: Jim Jerzycke
Sent: Sunday, January 19, 2014 2:09 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: 145 MHz signal blocking 435 MHz downlink
Buy a diplexer, and connect it as shown in the linked article:
http://www.amsat.org/amsat-new/articles/Mode-J/
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
On 01/19/2014 06:56 PM, Gabriel - EA6VQ wrote:
...
Hi all,
I have a coupling problem in my station when trying to work FO-29.  
My 2m
signal is completely blocking the 435 MHz downlink, and so I can't 
hear my
signal off the satellite. I guess it must be something related to the
distance between the two yagis. (I use the terrestrial horizontal 
yagis you
can see at http://www.dxmaps.com/jm19hn.html ). With mode-B 
satellites there
is no problem.  I have tried it with two different 435 receivers, and 
it's
exactly the same.
Anyone has had this problem o have an idea of the possible reason?  
And what
is more important, of some way to solve it?
Thanks for any possible help.

Gabriel - EA6VQ

Web-Site: HTTP://www.dxmaps.com
VQLog 3.1 (build 78): HTTP://www.vqlog.com
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