[amsat-bb] Re: mode J filter / Comet CF416c

Ken Shutt kgshutt at cox.net
Fri Dec 28 08:54:55 PST 2007


I would recommend putting the preamp as close to the antenna as possible. 
The diplexer should go between the radio and pre amp.  If you are planning 
to feed dc to the preamp on the coax, you need to make sure the diplexer 
will pass the dc to the preamp.

73 de Ken W5KQ
----- Original Message ----- 
From: "K & R Yoksh" <yokshs at sbcglobal.net>
To: "Amsat BB" <amsat-bb at amsat.org>
Sent: Thursday, December 27, 2007 9:51 PM
Subject: [amsat-bb] mode J filter / Comet CF416c

> Hello everyone,
> I'm planning to install a diplexer ahead of my 70cm mast-mount preamp 
> soon,
> and was interested to know any tips or tricks before I buy a diplexer and
> climb the tower.
> I was planning to go the cheap route, and buy the $35 MFJ-916b sold by my
> local ham store, but read in the manual:
> "The MFJ-916B is designed for indoor use. If you use the MFJ-916B 
> outdoors,
> it should only be used for short periods of time under good weather
> conditions. Do not use the duplexer outdoors when there is any kind of
> precipitation."
> After reading that, I'm considering spending a little extra and buying the
> Comet 416c that others have had good luck with.
> I had planned to mount the unit inside of a section of PVC pipe with a 
> pipe
> cap glued on the top, and open at the bottom. A single U-bolt should 
> attach
> the unit to the tower.
> Please reply with any suggestions, or perhaps you know of an unpublished
> sale going on somewhere? Thanks!
> Happy New Year to everyone on the list, and I hope we'll see P3e launched 
> in
> 2008!
> 73,
> Kyle Yoksh
> K0KN
> Olathe, Kansas
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