From: "Dave Sergeant" <dave@davesergeant.com>
To: rsgb_lf_group@blacksheep.org
Date: Mon, 14 Sep 2009 21:31:00 +0100
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Subject: LF: Re: MY first WSPR - by ear ;)
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Not quite Dennis. A WSPR transmission period is 114 secs, starting on 
each even minute and stopping at 54 seconds after the second minute. 
These periods are fairly accurately timed. A station transmitting will 
have set his desired transmit duty cycle, from 10% to 100%. So you will 
occasionally hear continuous transmissions except for a gap of 6 
seconds before each even minute. More usually it will be more like a 
25% duty cycle with transmissions every 4 or 5 cycles. In your case you 
heard a station with a 50% duty cycle, transmitting one period and 
listening the next.

Just got bored and turned the WSPR monitor off, solid copy of SM6BHZ 
with the occasional one from G7NKS. It seems nobody else is on tonight.

73 Dave G3YMC

On 14 Sep 2009 at 21:54, Dennis wrote:

> 
> > >>>I have learnt, WSPR sounds like a slightly rough CW and is
> > >>>transmitted
> > in 
> > >>>4min-blocks. <<<<<
> > 
> > Dennis , That may  not be wspr , wspr  tx time is  120 seconds locked
> > to the exact time , with the  start time on the  00-00 by sound its
> > like a very  slow narrow shift psk signal .....but it is only one 
> > carrier  changing frequency  with  no breaks in the 120 second
> > transmission
> 
> Okay better to say: One cycle seemed to be 4min, divided into abt.
> 115sec TX and 125sec no TX, maybe RX? The beginning of the received
> transmissions were always well within half a second around even minute +
> zero seconds which to me seems to be the strongest hint that is really
> was some wspr what I was hearing. (DCF77-clock beside the speaker)
> 
> Since yesterday I'm looking for a notebook - to run wspr :)
> 
> vy73
> Dennis
> DL6NVC
> 
> 
> 
> 
> 
> 
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http://www.davesergeant.com