Ok Dennis,
Yes I see what you are describing, the system has some randomness in the
tx / rx windows , most stations will set the system to 33% tx , ie you
send for 33% of a time period ..... the system is in 'rx' for the other
2/3 of the time ...... as the top of the minuet approaches, the system
enters 'rx' mode and records for a 120 second window .. this co insides
with 'other' stations commencing tx
Once the window is closed ,the received file is processed and the
results are displayed on your screen and if selected , the software will
transmit the results via the web to the central data base , which , by
the locator also calculates the distance
Your station will then wait till the next 00-00 and either enter tx or
re commence 'rx' , don't worry too much about frequency stability, the
system will resolve quite a drift during rx and a few seconds of time
error
G ..
--------------------------------------------------
From: "Dennis" <[email protected]>
Sent: Monday, September 14, 2009 8:54 PM
To: <[email protected]>
Subject: Re: LF: MY first WSPR - by ear ;)
>>>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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