Analog transponder revisited
Folks,
Under AOB last night I raised a question regarding there apparently being no analog transponder on board as far as I can see in recent documentation.
I was of the impression that a parallel analog transponder would be flying as well as the SDX.
I am concerned that as this was a hot issue several months ago, I would respectfully request that we clarify the situation at the next meeting prior to the Symposium.
73, Howard G6LVB
Hello Howard!
Under AOB last night I raised a question regarding there apparently being no analog transponder on board as far as I can see in recent documentation.
I was of the impression that a parallel analog transponder would be flying as well as the SDX.
I am concerned that as this was a hot issue several months ago, I would respectfully request that we clarify the situation at the next meeting prior to the Symposium.
Sorry I had to leave the meeting early last night.
The analog transponder package(s) for Eagle were decided to be based on SDX technology at the meeting in Pittsburgh in Oct 2005. The overall architecture - including preliminary wiring harness design - was then drawn up at a subsequent meeting in Colorado Springs later that same month.
It is all part of our transition from reaction to AO-40 (we will do everything using low-risk, proven technology and have no propulsion system) to a satellite for the future, using lessons from AO-40 without being haunted by its ghost.
-Lyle
Hi Lyle
The analog transponder package(s) for Eagle were decided to be based on SDX technology at the meeting in Pittsburgh in Oct 2005. The overall architecture - including preliminary wiring harness design - was then drawn up at a subsequent meeting in Colorado Springs later that same month.
Thanks for your comments.
I am referring to this from Rick, sent on 25 July 2005:
See the Eagle specification document at http://www.amsat.org/amsat-new/eagle/Eagle_Fall_2004.php
It says "To provide a safe backup system in case of a failure in the digital implementation of the linear transponders there will be two S-Band transmitters and either of them will be capable of being driven by the SDR driver or by a traditional analog linear driver. One or more of the receivers will also be capable of analog operation."
Which was in direct response to this question:
I'd hate to think we are going to hang our entire mission on just the SDR transponders. Wouldn't it be prudent to include at least a bare bones analog backup transponder? Please tell me this is the plan.
If the situation has changed, then I am not sure that we have properly communicated it. My concern is that if we don't deal with this then it will come out and bite us in the future.
73, Howard
participants (2)
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Howard Long -
Lyle Johnson