[amsat-bb] Original email about "First(?) 144-MHz-QSO via Reflexion on ISS"
w8iss at wideopenwest.com
Tue Dec 11 21:22:21 PST 2007
Here's the original email I received off the Moon-net EME reflector Sunday for
those of you who are not subscribed to it.
---------- Forwarded Message -----------
To: "'Moon-Net'" <moon-net at list-serv.davidv.net>
Sent: Sun, 9 Dec 2007 17:58:19 +0100
Subject: [Moon-net] First(?) 144-MHz-QSO via Reflexion on ISS
Triggered by Peter SM2CEW's tries to complete a QSO by using the ISS as a
reflector Frank DH7FB and I decided to try that as well. From Peter's
experience (and also Frank's when SWLing Peter's tries) we believed it would
be worthwile considering BPSK63 as this would enable us to exchange all
information within few seconds only (using the EME report and QSO rules).
However with the first tries on 8 December we quickly had to realise the
amazingly quickly changing large doppler makes use of this mode impossible
and we returned back to good old CW since this is also copyable at such a
situation when you are not 100% tuned on the signal. The second try today
Sunday 9 December at ISS orbit 51845 starting with a common window at 1626Z
we copied signals at elevations of > 20 degrees and within a minute
exchanged all data. Signal reports were about S3...S5 (DF2ZC running only
300 watts out). It was a tough task to follow the quick doppler changes and
also adjust elevation and azimuth rotators. Two hands is at least one too
That was a thrill! And now we are celebrating...
And we will try more QSOs the coming days.
btw http://www.n2yo.com/ gives a nice live google earth graphics display of
ISS and other satellites.
vy 73 Bernd DF2ZC (JO30RN)
144 MHz EME NewsLetter:
144 MHz DXCC #21
144 MHz WAC
Kenwood TS 2000
2 x GU74b by LZ2US
4 x 2M18XXX 21 dBd full elevation
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