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CX2SA > SAT 21.08.04 02:08l 58 Lines 2313 Bytes #999 (0) @ AMSAT
BID : ANS-235.02
Read: GUEST
Subj: ECHO Operations Update
Path: DB0FHN<DB0MRW<DB0ERF<DB0FBB<DB0GOS<DB0EEO<DB0RES<ON0BEL<W1NGL<WU3V<
ED1ZAC<CX2SA
Sent: 040821/0002Z @:CX2SA.LAV.URY.SA #:2791 [Minas] FBB7.00e $:ANS-235.02
From: CX2SA@CX2SA.LAV.URY.SA
To : SAT@AMSAT
AMSAT News Service Bulletin 235.02
>From AMSAT HQ SILVER SPRING, MD.
August 21, 2004
To All RADIO AMATEURS
BID: $ANS-235.02
- Telemetry Capture
Thanks to all stations that collected and submitted Telemetry this week.
Also, a new version of TlmEcho has been released. Please upgrade to
version 1.0.5. When commissioning is complete, and Echo is running
smoothly, we will work on improvements to the software package.
- FM Voice Mode over the weekend of 21 August
We will again run the FM voice repeat transmitter (TXB, 435.300) at
higher power levels over the weekend. This will begin on 21 August
(1700 utc) and end on 23 August (0300 utc). The times are approximate.
During this period the Digital Transmitter (TXA, 435.150) will be turned
off except over the command stations.
This past weekend, during the High Power test, TXB was at the following
power levels (again, times approximate):
14 Aug 0200 to 15 Aug 1500, TXB = 1.06 watts
15 Aug 1500 to 16 Aug 0200, TXB = 1.45 watts
16 Aug 0200 to 17 Aug 0200, TXB = 1.87 watts
- Experimenters Wednesday
This week we will test the S Band transmitter on Exp Wed. Between 25
Aug at approximately 0155 utc, and 26 Aug at 0250 utc, Echo will be
configured for Mode V/S, FM repeat. The uplink will be on the 145.920
mhz user receiver, and the downlink on 2401.200 mhz. The PL tone
function will not be used in this mode, therefore the 67 hz tone is not
needed. The S Band transmitter will be turned on continuously, so those
stations not uplinking will still be able to monitor and practice their
Doppler correction. During this time, the Digital Transmitter will be
turned off.
We understand that running VHF for the uplink will cause some stations
to be unable to uplink to the satellite, having to use their VHF
transceiver for the S band downlink. But please understand, this is the
best way for us to test the S Band Transmitter over multiple orbits. We
will be collecting WOD while the transmitter is turned on to monitor the
power usage and temperature while in this mode. After studying the data
we will schedule a Mode L/S test.
Good luck and enjoy the first opportunity to use Echo's S band
transmitter.
[ANS thanks Mike Kingery, KE4AZN for the above information]
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