All:
U and L receivers will always be on, is my understanding of requirements.  I've seen nothing to change that.  The subject of 1 or 2 receivers at U and/or L is fuzzy, and a topic I wish to bring to closure over the next month or so.

There is a top-level block diagram, possibly in need of slight revision, on EaglePedia, in the report of the "Black Forest" meeting in Oct/Nov of 2005.

Tom:  Pls forward to Bill.

Thanks & 73,
Jim
[email protected]


Bill Ress wrote:
Hi Dick and Bdale,

Good points about keeping the command receiver on 100% - no issue there. 
But I think the matter is somewhat confused (at least for me) since I 
believe the command receiver that John has designed is also the 
data/analog receiver. I don't recall that being the case is the past 
satellites. If command and data function stay combined, then that's all 
the more reason for considering John's suggestion for two U receivers.

Correct me if I'm wrong, but I also understand that there will also be a 
separate L command receiver, but again not sure about that too.

Gosh - just think how handy a satellite top level block diagram might 
be, even if its a work in progress. Or is there one and I haven't bumped 
into it.

Regards...Bill - N6GHz

Dick Jansson-rr wrote:
  
In my recollection there has been no option to anything with a command
receiver at all in past satellites. This receiver was ON to be able to do
its function regardless of other 'activities' on the satellite. In other
words, it could not be messed with for any reason. Such a capability is
absolutely essential for the health (and recovery) of the satellite and its
mission.

Dick Jansson, KD1K
[email protected] 
[email protected] 
---------------------------


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Bdale Garbee
Sent: Wednesday, 11 April, 2007 1439
To: Bill Ress
Cc: [email protected]; EAGLE
Subject: [eagle] Re: Eagle 10 MHz Clock


On Tue, 2007-04-10 at 14:12 -0700, Bill Ress wrote:

  
    
Don't think power would be impacted since the spare unit would be in a
power down mode.
    
      
Please don't assume that it's ok to have the power to a command receiver
switchable without substantial discussion and review.  All prior AMSAT
projects that I'm aware of have had command receivers always on, even if
they weren't always in use.  I'm pretty confident that includes both of a
redundant pair.  Happy to be corrected by others with better knowledge of
history if I'm mis-remembering some relevant case.

Bdale

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