[amsat-bb] Australian CubeSat to use 76 GHz

[W3AB/GEO]

1 - I believe one can address the beamwidth.

2 - I thought they going to measure atmospheric water, perhaps that's why that freq was chosen.

⁣___
Sent from my two way wrist watch
73 de W3AB/GEO​

On Apr 13, 2019, 10:47, at 10:47, Robert Switzer <rs2atmink at yahoo.com> wrote:
>I heard about 2 concerns from my brother, who knows those who guys who
>work that freq:
>1. Not sure what kind of power they are running but even a small
>dish(say 12") it this freq has an incredibly narrow beamwidth. Would
>take one heck of a tracking mechanism to follow a sat unless it is
>goestationary. 
>2. Another problem with this freq is it is right on a water adsorption
>line in the atmosphere. From orbit you won't have of go thru a lot but
>its still there.
>Anyone address these during the design phase of the sats?
>Rob KA2CZU
>
>On Saturday, April 13, 2019, 1:27:18 PM EDT, W3AB/GEO via AMSAT-BB
><amsat-bb at amsat.org> wrote:  
> 
> 
>4) Communication Protocols Modulation techniques that will be
>investigated for the high-speed communications experiment include QPSK,
>16-QAM and CPFM. If successful, this technology for wavelengths below
>10 cm will increase the data transfer rates by at least 4 orders of
>magnitude while also decreasing the sizes of antennas and the
>associated spacecraft.
>
>⁣___
>Sent from my two way wrist watch
>73 de W3AB/GEO​
>
>On Apr 13, 2019, 08:52, at 08:52, Zach Metzinger via AMSAT-BB
><amsat-bb at amsat.org> wrote:
>>
>>Posted on anther list by WA5JAT:
>>
>>https://amsat-uk.org/2019/04/12/australian-cubesat-to-use-76-ghz/
>>
>>Uplinks specified on that page, but no data as to if they are purely 
>>digital, analog, etc.
>>
>>--- Zach
>>N0ZGO
>>_______________________________________________
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>_______________________________________________
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