[amsat-bb] Diplexer recommendation

Greg D ko6th.greg at gmail.com
Mon Jan 8 21:19:13 UTC 2018

Hi Rico,

So, two questions:

First, what are you planning to use for your radio(s)?  I'm a bit
puzzled by the need to swap Tx and Rx connections, if you are using a
diplexer.  And, most of the satellite operations I do involve either two
separate radios, or a satellite radio that has separate VHF and UHF
antenna connections.  In those cases, you'd not need the diplexer at
all, since the purpose of a diplexer is to use one feed line to cover
two antennas.  Could you share your "two diplexers and two switches"

Second, that's a really cool antenna that you have built.  Are the plans
available online somewhere?

Greg  KO6TH

Rico van Genugten wrote:
> Hi all,
> I'm slowly assembling my satellite base station setup bit by bit, I have
> recently mounted an antenna system on my roof consisting of two
> perpendicular VHF/UHF open-sleeve yagi's mounted at a fixed elevation of 25
> degrees on an azimuth rotator, more info here:
> https://twitter.com/PA3RVG/status/942710621375815680
> So I have two feed lines coming into the house, both suitable for VHF and
> UHF operation. I want to be able to independently select one of the two
> antennas for RX and TX. This can be realized using two diplexers and two
> switches, but now for the million dollar question: Which diplexer?
> I'm curious to know which diplexers you guys use if you use them, and which
> can be recommended in terms of insertion loss, VSWR and isolation. If you
> believe the manufacturer specifications they are all great, but I'm more
> interested in real life performance or test measurements.
> 73,
> Rico
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