[amsat-bb] EsHail Microwave transponder satellite

[Rico van Genugten]

Hi Remco,

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
too. :)

Rico PA3RVG



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
> downlink
> 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
> illumination.
> In my prototype the LNB looks 'through' the helix.
> Antenna will be a Triax 88cm broadcast satellite dish with f/D of around
> 0.6.
> 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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