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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)
Sent: Saturday, November 24, 2012 3:11 AM
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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