[amsat-bb] Re: S band or any backup?

[Robert McGwier]

>"David wrote:

>It would be good to know that the linear backup plans have not been quietly  
>filed in the waste paper basket.  "

The SDX will be subjected to really brutal radiation testing. It does sound sweet to have a transmitter and receiver as linear as the SDX can be.

I do not know anyone who is building the fall back piece and while it has not fallen off the table,  I don't know who is building it.  


 
"Good engineering is important, but planing for the unexpected is  vital."

Indeed.
 
 
"Incidentally. It occurs to me that a disadvantage of having one major  UV 
transponder operating 24/7 is that while that concept removes the need for  
complicated scheduling it will occupy 100kHz or so of the 2m band permanently  
which may not be totally desirable in a limited 200kHz  bandwidth. Presumably with 
Eagle 2 and 3 under design / construction  at the time of launch they will 
have differnt bands. - Maybe 2390 - 2400  ish

Good point.  The 7/24 plan does include the digital piece in our plans.  And yes, we do NOT have to duplicate U/V on follow on birds to Eagle.  If P3E goes well and  we see no need for another U/V transponder we can indeed do something different on subsequent Eagles.
 
Enjoying the debate
 
David   G0MRF
"

-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York and his head is meowing in Los
Angeles. Do you understand this? And radio operates exactly
the same way: you send signals here, they receive them there.
The only difference is that there is no cat." - Einstein