[amsat-bb] EsHail Microwave transponder satellite_ 2.4 Ghz / 10.5 Ghz dual-band feed

[Michael R. Lengruesser]

Some of our members have dealt with this problem and there are already
the first positive results.
see attachment
It will appear to several publications on this topic in the near future

73 de

Michael R. Lengruesser, DD5ER

AMSAT-DL e.V.

-- International Satellites for
Communication, Science and Education --

mlengruesser at amsat-dl.org
http:/www.amsat-dl.org

Am 01.06.2016 um 19:22 schrieb John Toscano:
> 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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>>>> expressed
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>> of
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>>> _______________________________________________
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>> _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>