Looks like freqs used were right around 2 gig and just above 2 meters too. according to this book http://books.google.com/books?id=_azf94TByF8C&pg=PA4&lpg=PA4&dq=...
Joe WB9SBD Near Space Sciences
The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com
On 6/29/2010 12:03 AM, Greg D. wrote:
Well, it's finally happened. We've come full circle. They've reinvented Echo-1. http://en.wikipedia.org/wiki/Project_Echo
Of course, that one was 10x larger. What makes this a 10m (band) operation? I expect it would work on the higher bands too, especially with the smaller size. What band did they use ~50-ish years ago?
Greg KO6TH
From: bruninga@usna.edu To: amsat-bb@amsat.org
CancelDate: Mon, 28 Jun 2010 13:44:45 -0400 Subject: [amsat-bb] HF Satellite Relay
Heard today of a Passive HF relay satellite being proposed. Wondered if Hams could relay off of it.
It's a 10m diameter sphere. I assumed a 10m signal and 1000 Watts And antenna gains at both ends of 10 dB. Unless I made a dumb error, it looks impossible? I get a received signal of -170 dBm Compared to a good HF receiver of -122 dBm So its 48 dB down in the noise. Going to narrow band, could improve things, but the Doppler of +/- 600 Hz would make that difficult.
Anyway, if someone else wants to double check the link budget using the radar range equation, go for it.
The beauty of this system is that it is perfectly spherical, so the reflection coefficient would be constant within 1 dB. That is the advantage over trying to use the ISS or other large rocket body... They vary by 20 dB making communication by reflection impossible.
Oh, and it would be in space for 30 years or more. So with something that reliable, it would be worth developing an amateur capability to use it. It is not designed for comms, but as a calibration sphere for over the horizon radars that have LOTS more power and LOTS more gain than we do.
Bob, Wb4APR
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