[amsat-bb] Re: Diplexer

N0JY n0jy at lavabit.com
Sat Apr 9 09:40:53 PDT 2011


I have used such a setup for some time now, I have a 2m/70cm diplexer at 
my desk and one at the antennas, so that I can use one feed line 
(LMR-600).  I also switch the heck out of the feeds with several coax 
relays in order to achieve different satellite modes as well as put the 
radios on my terrestrial vertical.  I acquired the relays and diplexers 
over the years at hamfests and online auctions, I think I bought a 
diplexer or two new also.

The article you may be referring to was in the May 2010 QST, by Steve 
Ford WB8IMY.  If you don't have that QST issue, you can view it online 
at ARRL if you are a Diamond Club member.

You can see a few pictures on the Satellite Antennas page of my website, 
http://n0jy.org.  On that page there is also a link to a PowerPoint 
presentation of the whole antenna switching scheme.  That will show you 
a bit about the use of the diplexers.

My experience in using this setup has been positive, I have no empirical 
data about signal loss or comparisons to what it was like before I went 
to one feedline.  The cables prior to the switch were RG-8 and Belden 
9913 anyway, so comparing to LMR-600 wouldn't be apples to apples.  It 
just works good.  I've had no problems with signal strength both up and 
down, and make all of the contacts I wish to.


On 4/8/2011 8:59 PM, N8GBU wrote:
> I was wondering if anyone has scene the article about using a diplexer (I
> think that's the right name) on both ends for a satellite setup? One where
> the two antennas are then a single feed then another one to split things up
> again by the radio. I think it was in QST but can't remember the issue or if
> someone has used that setup I would like some input ......Thanks and 73's
>         Mike   N8GBU

__________ Information from ESET NOD32 Antivirus, version of virus signature database 6028 (20110409) __________

The message was checked by ESET NOD32 Antivirus.


More information about the AMSAT-BB mailing list