[amsat-bb] Re: Transponder

George Henry ka3hsw at att.net
Sat Aug 6 08:23:40 PDT 2011

No joy on the 12:00Z pass (48 deg max elev) here...  could hear the CW beacon, 
BPSK, and FM transmissions with deep fades, but otherwise quite well.  No other 
stations heard in the transponder passband, nor could I hear myself on the 
downlink, from 5 to 75 watts uplink using omnis (M2 eggbeater w/preamp on the 
downlink, homebrew turnstile on the uplink).  Next pass here not until 04:30Z.

It doesn't appear that the satellite has any active or passive attitude control 
system.  I have heard that the spin should eventually settle around the same 
axis as the antenna, but is there any reasonable hope that that would happen 
during the satellite's operational lifetime?

George, KA3HSW

----- Original Message ----
> From: "Rsoifer at aol.com" <Rsoifer at aol.com>
> To: amsat-bb at amsat.org
> Sent: Sat, August 6, 2011 8:48:21 AM
> Subject: [amsat-bb] Transponder
> On the ARISSat-1 pass just ended here (23 degrees max elevation), results  
> were about the same as yesterday.  I heard my CW downlink for about a  
> minute, peaking 559.  Several other CW signals were in there, but  I couldn't 
> their calls due to the deep fades.
> Bruce appears to be right that the transponder's performance depends  
> largely on the spacecraft's orientation.
> 73 Ray W2RS

More information about the AMSAT-BB mailing list