Further update on this problem.
G0FTD seems to have intermittent thin WSPR data trace and no de-codes on 28MHz but has seen a decode or 2 of his own signal after fiddling.
My unit is absolutely consistent with its performance.
Further tests here and measurements reveal that that WSPR Data spacing is totally wrong. At 7.00MHz the difference between tone 0 and tone 3 is 10Hz this decodes because of WSPR's tolerance, as we increase the frequency the tone spacing gets smaller, I am not sure yet where it gets about right but after 21MHz it has got too small for it to de-code. At 28MHz it is down to around 4Hz the WSPR data is all there but its noticeable that Data 3 occupies the Data2 frequency.
If the frequency shift variation is linear, let us assume it is, then:-
7MHz = 10Hz
10.5MHz = 9Hz
14MHz = 8Hz
21MHz = 6Hz
22 MHz = <6Hz
28MHz = 4Hz
If I had not already established the point where decodes fail it could be predicted from the table above, when the spacing is less than 6Hz ie 22MHz. Additionally the only frequency where it is right is 21MHz. Tomorrow I will check the theory by measuring at 21MHz.
Eddie G3ZJO
