On Sun, 2007-06-17 at 08:48 -0700, Juan Rivera wrote:
I've completed my testing and analysis of the spurs that appeared in the IF output of the 70 cm Eagle Receiver prototype. I believe I know the source and the cause of all of them and how they can be eliminated or rendered harmless.
Nice work.
Reading your report, two things strike me, neither of which I consider myself an expert on in AMSAT or elsewhere, but both of which I'll mention to help motivate the review of power system requirements you clearly hope comes next/soon.
The first is that I think AMSAT does understand most if not all of the issues you're warning against regarding DC distributiong wiring. Some care was taken, for example, in planning pinouts of the 15-pin connector on the spacecraft bus side of the CAN-Do! widget, and in the proposed wiring harness design from the Black Forest meeting.
The second is that I think more work is going to be required to ensure receivers behave reasonably in the presence of supply noise. For various reasons, as others have already alluded, I wouldn't count on the Eagle power bus being very quiet.
Bdale, from Edinburgh