From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
Organization: Radio Society of Great Britain
To: rsgb_lf_group@blacksheep.org
Date: Fri, 26 Mar 1999 10:01:34 -0000
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Subject: Re: LF: 137 Carrier
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> >From Dave G3YMC
> The RTTY signal which has reappeared on or around 137kHz is the self same
> signal we were discussing in January and at various other times.  It
> appears for a few days at a time and then disappears for a month or so.  It
> has the definite characteristics of a transatlantic signal, being inaudible
> during the day, appearing in the late evening and being quite strong around
> dawn.  It disappears around one hour after dawn, although I have heard it
> rather later in the morning and once in the mid afternoon.  Very
> characteristic of US amateur signals on 160m.
>

I agree. This was also observed this time last year, too. 

Last night the signal was about S2 during the late evening and 
when I checked it again at 0030UTC it was S7 and stayed at that 
strength until I stopped listening at 0230. I did not experience any 
QSB. It was not audible at 0800. I make the shift 75Hz.

On a similar subject, it would be really useful to be able to plot 
signal strength against time (say, 24 hours) using a computer - for 
simplicity it would help to use the sound card so that the same 
connection can be used as Spectrogram. It is =just= possible to 
do this with Spectrogram, though the amplitude resolution is poor 
and only ten minutes or so can be moniored. Does such software 
exist? Yes, I know I can build an A-D converter and write software 
etc, etc but if someone has already done the work so much the 
better.


Mike, G3XDV (IO91VT)
http://www.dennison.demon.co.uk/activity.htm