RE: LF: Would slower QRSS help?

[Bob Raide <rjraide@hotmail.com>]

G;
I plan to manually change freq 10 MHz top of hour for couple three hours is all-should be no trouble-Bob
 

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From: g8fzk@g8fzk.fsnet.co.uk
To: rsgb_lf_group@blacksheep.org
Date: Sun, 2 Mar 2014 19:42:28 +0000
Subject: Re: LF: Would slower QRSS help?

Bob,

 

There  are  no  more   band  slots  left  in the  psk-map , we  have used them  all  up  , so  your  flying  solo  on this  one  !

 

Could be  a  job  for  Op4H ,  but the  decoder is  set to  8K .....not  a problem  for   a  SDR  , set  up  ,  racal 6790gm   has a  synth  bfo  that  can be  set  8K off  , don't  know  what  other  sets  are  about  with  that  kind  of  bfo  range

 

I think  Spec-Lab    has a  frequency   convertor  mode , never  used  it  , not  sure  how the  interface  is  configured , but  if that  can get the  audio   from  say 1500  hz  upto  8KHz  in software  , then  that  opens    up some  possibilities

 

73-G,

From: Bob Raide

Sent: Sunday, March 02, 2014 7:25 PM

To: rsgb_lf_group@blacksheep.org

Subject: RE: LF: Would slower QRSS help?

Paul;
Jay and Stefan and you suggested I should transmit carrier for 1 hour on 29.49900 then move up 10 MHz [29.49901] for hour and back again a few times and then will start QRSS180.  Does that make sense? Bob
 

> Date: Sun, 2 Mar 2014 19:06:37 +0000
> From: vlf0403@abelian.org
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Would slower QRSS help?
>
> > I will be running in QRSS 180 tonight.
>
> Good luck. After last night's test maybe a few more receivers
> will be listening on 29499 Hz. I'm sure this signal will go
> a lot further than UK. It counts as a strong signal here
> and there is 10 or 20dB or more (depending on rx bandwidth)
> in hand to reach further into Europe.
>
> More plots: a graph of signal level and phase, 10 minute
> averages stepping 5 minutes.
>
> http://abelian.org/vlf/tmp/29499_140302k.gif
>
> The background noise is plotted after sferic blanking.
>
> On the spectrogram it looks like the noise tails off more
> sharply between 04:00 and 04:30 but when I actually plot
> the noise it's a quite smooth decline. But the signal is
> gradually coming up hence the appearance of a 'window' in the
> 2 or 3 hours before dawn.
>
> For comparison, NAA at 24kHz during the same period
>
> http://abelian.org/vlf/tmp/29499_140302m.gif
>
> Some pronounced dips during the night at 29499 Hz don't appear
> in the NAA record.
>
> --
> Paul Nicholson
> --
>