[amsat-bb] Re: satellite spectrum

[g0mrf at aol.com]

Not sure I understand why 50 cubesats in orbit for 3 - 6 months doing 
atmospheric research will 'cause stress' on bandwidth.

If you have a generous 20kHz spacing to allow for +/- 10kHz doppler, 
then we have 1MHz of spectrum.
OK, there are other occupants than need to be avoided but there are 
3MHz available.

Sounds like a good use for a reworked version of ' CW skimmer '

Thanks

David  G0MRF






There is, however, no denying that the Amateur-satellite Service 
requires more
spectrum. The key spectrum for us is at VHF/UHF below 1 GHz but we only 
have two
allocations - 435-438 MHz on a secondary basis, shared with the 
Military, SAR
satellites and others, and the 144 MHz band of which only 200 kHz, 
144.8-146
MHz, is available to us.

You can see that when the QB50 project deploys 50 CubeSats it's going 
to put the
available spectrum under stress.




-----Original Message-----
From: Trevor . <m5aka at yahoo.co.uk>
To: amsat-bb <amsat-bb at amsat.org>
Sent: Thu, 27 Sep 2012 18:03
Subject: [amsat-bb] Re: satellite spectrum


> You can read the article in their online version
> of the magazine at: 
http://accessintelligence.imirus.com/Mpowered/book/vvs12/i10/p1

Thanks Howie,

There's also a text version of the article at

http://www.satellitetoday.com/via/globalreg/Nano-and-Pico-Satellites_39485.html

What struck me as odd from the paper circulated at WRC 2012 was the 
concept of
creating a new ITU Radio Service based on the size of the equipment 
that would
house the radio transmitter.

There is, however, no denying that the Amateur-satellite Service 
requires more
spectrum. The key spectrum for us is at VHF/UHF below 1 GHz but we only 
have two
allocations - 435-438 MHz on a secondary basis, shared with the 
Military, SAR
satellites and others, and the 144 MHz band of which only 200 kHz, 
144.8-146
MHz, is available to us.

You can see that when the QB50 project deploys 50 CubeSats it's going 
to put the
available spectrum under stress.

Hopefully US members are periodically reminding ARRL of the need for 
additional
Amateur-satellite Service spectrum (Earth-to-Space and Space-to-Earth) 
in the
VHF/UHF 40-1000 MHz region. Global allocations at 2300 and 3400 MHz are 
also
needed.

73 Trevor M5AKA
----


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