[amsat-bb] EsHail Microwave transponder satellite
tosca005 at umn.edu
Wed Jun 1 17:22:44 UTC 2016
I don't think it is possible to create a dual-band dish feed that covers
2.4 and 10.5 GHz. AMSAT folks are working hard on a 5G/10G dual-band feed,
and that is difficult. Even more complicated is your desire to use a
commercial 10G satellite TV LNB as one of the two feeds. I think you are
going to have to use two antennas for those 2 bands. The 10G dish with
satellite TV LNB for one of them, and either a separate dish or a loop yagi
or something else for the uplink. A Yaesu Az/El rotor can handle a pair of
antennas, in fact it is almost a re
On Wed, Jun 1, 2016 at 6:19 AM, Žilvinas Atkočiūnas <
zilvinas.atkociunas at gmail.com> wrote:
> Hi all,
> Any ideas how to use two antennas with single dish ? (one of them SAT LNB)
> Zilvis LY2SS
> 2016-05-31 17:28 GMT+03:00 Rico van Genugten <rico.van.genugten at gmail.com
> > 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
> > and where you got the UMTS PA, and I'm sure some other people on this
> > 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
> > > >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
> > > 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
> > > 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
> > > (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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> > to all interested persons worldwide without requiring membership.
> > expressed
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