[amsat-bb] Re: satellite spectrum

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@yahoo.co.uk To: amsat-bb amsat-bb@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.h...

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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