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RE: Mode U/s available on future birds?



Kyle,

Q1 (Mode U/s): It's to soon to say for sure what will be on Eagle,
AMSAT-NA's next high orbit satellite, but I would expect Mode U/s will be
accommodated to support all those who have invested in this mode for AO-40.
One of the experimental modes that can be activated on Echo is Mode U/s (FM
voice and data only) but that will be a challenge due to the high Doppler
shift and the rapid movement.

Q2 (matrix): The current state of Eagle's design includes a matrix so any
receiver can be connected to any transmitter.  The design is not finalized
and I expect there may be at least one exception to this, the mode C/c
transponder (see the C-C Rider article by W3IWI in the 2003 Proceedings).

Rick
W2GPS
AMSAT LM 2232


-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On Behalf
Of Kyle Yoksh
Sent: Friday, April 02, 2004 3:17 PM
To: amsat-bb
Subject: [amsat-bb] Mode U/s available on future birds?


Hello group,

I received my journal yesterday, and have enjoyed reading it!  The Echo and
Phase 3e info was very interesting!

I have not had a chance to read all of the Journal, so excuse me if these
questions have already been addressed. I've been scouring the Amsat-NA and
Amsat-DL web sites, with no luck.

Q1:
I'm anxious to find out if the satellite designers are planning on using
Mode U/s again, especially on the new HEOs? I'd like to know as soon as
possible, so that I can plan my antenna configuration for a tower I'll be
installing this summer.

I put together a pretty decent S-band downlink for AO-40, and had great
results!  In spite of Leila's false alarms, etc - I really enjoyed U/s
operation! I am not in a position to build an L-band uplink at this point,
so if L/s will provide the only S-band downlink, I suppose I'll leave the
dish in the basement..

Q2:
The info that I've read up to now leads me to believe that fixed
transponders will be used, rather than the matrix type used on AO-40?

Thanks for any help. I'm still keeping my fingers crossed that AO-40 hasn't
given up yet!

73,

Kyle Yoksh
K0KN
Amsat #35249



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