----- Original Message -----

From: Markus Vester

To: [email protected] ; [email protected]

Sent: Saturday, November 24, 2012 10:52 AM

Subject: [rsgb_lf_group] Re: LF: VO1NA at 20:00 - or not?

 

Gary,

 

your screenshot shows DFCW suffixes from RN3AGC around 137779, RA3YO arond 137777.6, and VO1NA on 137776.9 Hz.

 

Best 73,

Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Gary - G4WGT <[email protected]>
An: rsgb_lf_group <[email protected]>; rsgb_lf_group <[email protected]>
Verschickt: Sa, 24 Nov 2012 10:28 am
Betreff: Re: LF: VO1NA at 20:00 - or not?

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 :-

 

https://www.dropbox.com/s/rvd79pkx4ezntf3/137780Hz-1211240800.jpg

 

73,

 

Gary - G4WGT.

 

----- Original Message -----

From: Markus Vester

To: [email protected]

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)

 

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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