[amsat-bb] Re: AMSAT Board of Directors Candidates
bill at hsmicrowave.com
Thu Jun 17 12:21:41 PDT 2010
The ARISSat-1 uses a linear transponder that is significantly more
The COMM RX, CMD RX and the half watt output linear COMM TX only draws
420 mA at 8 VDC. The entire design can also be configured to run
directly from 3.6 Vdc, which is conveniently the voltage of a Lithium
Ion cell. In the absence of the battery cell (if troubles arise with the
battery), it could also run directly from a pair of series connected
solar cells (but not at the 0.5 watt output level), which typically run
about 4.6 V. Additionally, the design can also fit into the CubeSat
So William's design isn't there yet - at least the last I heard.
So you ask, why don't we use it in FOX?
Well 420 mA is still too to close to the current output capability for
the typical CubeSat solar cell setup. Remember, you also need current to
run the IHU, the MPPT etc. But we're always working on improving the
efficient in the linear mode - so who knows.
The AMSAT-UK FUNCube folks will be designing a linear U/V transponder
for their CubeSat, so we'll be watching their results closely.
Regards...Bill - N6GHz
ARISSat Team Member
Rocky Jones wrote:
>> Just have a look at PE1RAH William Leijenaar web page http://www.qsl.net/pe1rah/
>> and look at his nano sat transponder satellite
>> Luc Leblanc VE2DWE
>> Skype VE2DWE
>> DSTAR urcall VE2DWE
>> WAC BASIC CW PHONE SATELLITE
> It is a clever device. I've never been clear as to why AMSAT NA is not using it. Works great on the Indian satellite..
> Robert G. Oler WB5MZO Life member AMSAT ARRL
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