|
Hi Marcus, Joe & LF,
After a failure of my 136kHz sound card Rx pre-amp
due to a mains surge the grabber was back on from about 2200utc last
night.
I note there are at least 3 visible signals on my
slow grab but I can only ID Joe VO1NA. The other two ? are not identifiable
due o the very slow scroll.
Can the owners of the other signals please confirm
the calls.
This mornings early grab can be seen at
:-
73,
Gary - G4WGT.
----- Original Message -----
Sent: Saturday, November 24, 2012 8:30
AM
Subject: Re: LF: VO1NA at 20:00 - or
not?
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)
>
> ?
>
>
This electronic communication
is governed by the terms and conditions at
http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2012.php
|
