Joe,
thanks for the info. That must have been around sunset on your side... the
signal then disappeared for a while and became again visible after midnight UT.
Coherent keying would be beneficial as it generates a sharp central line in the
spectrum which aids detection of below-noise QRSS or Opera signals. The source
doesn't need to be referenced to GPS or similar, any stable oscillator will
suffice as long as it is not interrupted by the keying. If you are now using a
divider to drive the PA you would need to let the divider continue during
key-up, and gate one of the subsequent driver stages instead.
It is also possible to generate coherent FSK or DFCW but this requires careful
adjustment of the symbol timing and frequncy shift so that df * dt is an
integer number (as in WSPR or WSJT-X).
Best 73,
Markus (DF6NM)
From: [email protected]
Sent: Saturday, November 24, 2012 3:11 AM
To: [email protected]
Subject: Re: LF: VO1NA at 20:00 - or not?
Dear Markus, Group.
Thank-you for the report. Yes, VO1NA is on the air however there is still
work needed towards achieving phase coherence keying! The TX is a 100
watt class E: an IRFP260N driven by a TC4427.
Hopefully the Decca will be back in service soon.
73
Joe
On Fri, 23 Nov 2012, Markus Vester wrote:
Nice signals from the east (YO and AGC in red) and west (an early?blue NA on
137777), simultaneously in the TA window
http://www.alice-dsl.net/df6nm/grabber/Grabber.htm
?
Well at?least that's what I thought,?but no?trace?of VO1NA?yet on
http://www.w1vd.com/grabber.html
?
Joe, are you on air?
?
Best 73,
Markus (DF6NM)
?
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