[amsat-bb] EsHail Microwave transponder satellite
Rico van Genugten
rico.van.genugten at gmail.com
Tue May 31 14:28:48 UTC 2016
Sounds like you made a lot of progress on your Es'HailSat2 groundstation
already. I would be interested to learn more about your transverter design
and where you got the UMTS PA, and I'm sure some other people on this list
On Tue, May 31, 2016 at 12:07 PM, Remco <pa3fym at amsat.org> wrote:
> >What are other folks planning to use on the uplink 2400 MHz and the down
> >link at 10,489 MHz, for the narrowband linear transponder ?
> I will use a cheap injection locked X-band PLL LNB with dielectric rod
> and additional converter to let the NB transponder land inside one of the
> bands my transceivers accomodate.
> For the S-band uplink a dedicated (simple!) TX converter is now prototyped.
> Output of the converter will be around 5 dBm to be inserted in an old UMTS
> (2.1 GHz) module, capable of delivering around 20 - 30W at 2400 MHz on the
> bench with this drive. Of course uplink output can be tweaked.
> I am also busy with the dual band feed, of which the downlink of course is
> inside the LNB.
> For the uplink I made a 6 turn LHCP helix but am now fiddling with the
> matching due to
> mechanical boundary conditions. At this moment of writing I (still)
> haven't a good match
> but I reckon this mechanical issue will be solved soon.
> Secondly I need to experiment with the phase centers of both up- and
> to maximise overall efficiency. Even when I'm not able to equalise both
> phase centers
> I have some room in my uplink budget to compensate for suboptimal
> In my prototype the LNB looks 'through' the helix.
> Antenna will be a Triax 88cm broadcast satellite dish with f/D of around
> All internal frequencies will be/are locked to GPS which allows my idea of
> building a
> SUT (satellite user terminal) [for portable use] in conjunction with one
> (1) transceiver.
> In other words, my concept will be that Es'hail2 behaves like a normal
> amateur band, albeit with some delay ;-)
> Remco PA3FYM
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