Frequency problems with 28 MHz WSPR

 

My HF radio is monitoring the WSPR frequency of 28.1246 MHz most days and feeding the reception reports up to the WSPRnet website.

As 10 metres is the highest HF band in terms of frequency, it is also the band that is subject to the most drift.

This is illustrated in the screenshot taken above on the 16th of August 2020. You can see two signals that are outside the WSPR band which is 200 Hz wide. As might be expected, I didn't get any successful decodes from that particular two minute period.

I've checked my own reports against others and I think I am pretty much on the correct frequency.

I just thought it was a nice example of how important it is to make sure you are on the correct frequency on WSPR. If there is any doubt then you should aim to be in the centre of the WSPR band and not at its edges.