[amsat-bb] Diplexer recommendation

[Robert McGwier]

Since I don't believe the isolation numbers, are they measured or claimed?

Bob
N4HY


On Tue, Jan 9, 2018 at 12:10 PM, Floyd Rodgers <kc5qbc at swbell.net> wrote:

>  I use diamond mx72n pair to allow a 100 ft run from shack to antennas
> using 7/8" hardline. .1db loss and plenty of power at 400/250w fm.
> isolation of the units back to back is 120db uhf/vhf which is plenty to run
> satellite with two radios and two antennas.
>
>     On Tuesday, January 9, 2018 10:22 AM, Paul Stoetzer <n8hm at arrl.net>
> wrote:
>
>
>  Page 10 of PA1IVO's presentation at the 2011 AMSAT-UK Colloquium
> includes measurements of the Wimo Diplexer. It appears to have very
> good specs in general, though it looks like losses were measured at
> 1.45 dB at 436 MHz, which is a bit high.
>
> https://ivok.home.xs4all.nl/pa1ivo/doc/AmsatColloquium2011.pdf
>
> 73,
>
> Paul, N8HM
>
> On Tue, Jan 9, 2018 at 11:16 AM, Rico van Genugten
> <rico.van.genugten at gmail.com> wrote:
> > Hi all,
> >
> > Thanks for the recommendation Patrick, I have contacted MFJ and hope they
> > will ship a couple of them to the Netherlands. I have also contacted WiMo
> > for some specs on their diplexers as they aren't available on their
> > website, I will share them on this list when I receive them.
> >
> > 73,
> > Rico PA3RVG
> >
> > On Tue, Jan 9, 2018 at 4:57 PM, Patrick STODDARD (WD9EWK/VA7EWK) <
> > amsat-bb at wd9ewk.net> wrote:
> >
> >> Rico,
> >>
> >> I had used either Comet or Diamond diplexers in the past, until I
> >> found the MFJ diplexers were about half the price of the Comet and
> >> Diamond units, with what I saw as comparable performance. WiMo in
> >> the US is like your description of MFJ in Europe; I've never seen
> >> or tried WiMo diplexers.
> >>
> >> One review I saw a while back actually showed the MFJ-916B to be
> >> much better than Diamond's MX-72:
> >>
> >> http://www.w4gso.org/news/comparing-duplexers-mfj-vs-diamond/
> >>
> >> The pictures and screenshots aren't in this article, but the text
> >> tells the story of this comparison.
> >>
> >> 73!
> >>
> >>
> >>
> >>
> >>
> >> Patrick WD9EWK/VA7EWK
> >> http://www.wd9ewk.net/
> >> Twitter: @WD9EWK or http://twitter.com/WD9EWK
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Tue, Jan 9, 2018 at 9:42 AM, Rico van Genugten <
> >> rico.van.genugten at gmail.com> wrote:
> >>
> >>> Hi all,
> >>>
> >>> I'm using an FT-897D for TX (non-duplex), and an Airspy and computer
> for
> >>> RX. Good idea to use four switches Greg, in fact that's what I'm
> currently
> >>> doing. With four switches you always use one antenna for RX and the
> other
> >>> for TX though, I want to be able to use the same antenna for RX and TX
> >>> when
> >>> that works better with the current satellite orientation. Using two
> >>> switches and two diplexers I would be able to independently select
> which
> >>> antenna to use for RX, and which one to use for TX. I posted the
> >>> connection
> >>> scheme on twitter (warning, mspaint ahead):
> >>> https://twitter.com/PA3RVG/status/950649511935905792
> >>>
> >>> But we are drifting from the original question: which diplexers? I have
> >>> heard good stories about the MFJ-916, but its availability is not
> great in
> >>> Europe. What about Comet, Diamond or Wimo? Are they any good?
> >>>
> >>> Regards,
> >>> Rico
> >>>
> >>>
> >>>
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>
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>



-- 
Bob McGwier
Founder, Federated Wireless, Inc
Founder and Technical Advisor, HawkEye 360, Inc
Research Professor Virginia Tech
Chief Scientist:  The Ted and Karyn Hume Center for National Security and
Technology
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
Director of AMSAT
Member of PVRC (Roanoke-Blacksburg), TAPR,  life member of ARRL and AMSAT,
NRVR.ORG (Rocketry)