Re: [amsat-bb] cube sat

[Wayne Estes W9AE <w9ae@xxxxxxxxxxxxx>]

Bob Bruninga wrote:

A linear transponder like FO 20/29.  2m uplink and 70 cm downlink.  Only 30 KHz wide is enough.  1W PEP Use DTMF and a key chain RX (postage stamp) for ON/OFF control and power management. Use a MIM chip for AX.25 telemetry.  It will easily fit in the 4" cube...

Wayne replies:
  
If the downlink was on 2m, people might actually HEAR it with omnidirectional antennas.  Steerable gain antennas would be required to hear a 1W transponder with 70cm downlink.  Each individual signal on the transponder would only have a fraction of a watt.

A camera with SSTV downlink could attract a lot of attention from schools, prospective hams, etc.  Again, a 2m downlink would be preferable because it has less Doppler shift.

Wayne Estes W9AE
Mundelein, IL, USA
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org