[amsat-bb] EsHail Microwave transponder satellite

[Robert Bruninga]

Im not following this closely, but if the bands were cross polarized, it
should be possible...?
Bob, WB4APR

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of John Toscano
Sent: Wednesday, June 01, 2016 1:23 PM
To: Žilvinas Atkočiūnas
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] EsHail Microwave transponder satellite

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
> 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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views of AMSAT-NA.
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