[amsat-bb] Diplexer recommendation
kc5qbc at swbell.net
Tue Jan 9 17:10:57 UTC 2018
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.
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.
> Rico PA3RVG
> On Tue, Jan 9, 2018 at 4:57 PM, Patrick STODDARD (WD9EWK/VA7EWK) <
> amsat-bb at wd9ewk.net> wrote:
>> 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:
>> The pictures and screenshots aren't in this article, but the text
>> tells the story of this comparison.
>> Patrick WD9EWK/VA7EWK
>> 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
>>> 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
>>> scheme on twitter (warning, mspaint ahead):
>>> 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?
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