[amsat-bb] Re: Diplexer
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
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