Saturday, May 14, 2011

WSPR...Rough guide to getting on the correct frequency

When it comes to using WSPR, 2 things are crucial......
1) The time on your PC must be accurate
2) You are on the correct frequency

The WSPR band is only 200 Hz wide and you really cannot depend on the frequency readout on your radio to make sure you are on the exact frequency.

One method I use.......and it's a bit 'rough' ;o) to stay in the middle of the pack...........
A) Figure out as best you can what frequency you should be on
B) Turn off the uploads to the WSPR website
C) Once you hear someone, see what frequency the WSPR programme on your PC says they are operating on and compare that to others on the WSPR website

As you can see from picture above, on the morning of the 14th of May 2011, 7 stations were hearing CN8LI in Morocco on 28 MHz. 6 of us around the 020 to 030 mark. So by adjusting my rig so that the spots are in this range, I'm probably pretty sure that I am close to the correct frequency.

You might notice that the spots from G8BKE are about 50 Hz higher than the rest of us...i.e. He is probably 50 Hz too low. As a result, he is probably not hearing  anyone who is transmitting in the top 25% of the WSPR band.

Considering that there is only one WSPR frequency per band, all you have to do is to note the frequency on your digital readout and use the same one in future.

1 comment:

MW0MJB said...

Thanks for posting this John..

Next time I try WSPR I'll give it a go..

73 de Simpson Cross