[Phil G4SPZ]

Agreed it can be quite hard to be sure you're listening on the right frequency to begin with, especially if (like mine) your receivers have analogue dials, mostly marked in metres, and the calibration may not be spot-on. What I did was set my sig gen to give 648.0kHz as indicated by my DFM, and tuned the first receiver to zero beat against the sig gen. I was then confident that whatever I heard must be Radio Caroline. The 1960s - 1980s pop music was a dead giveaway when it faded up. Leaving the first receiver tuned in, I then tuned other sets to the same frequency.

In my listener report I have included the times and songs heard, more or less as per my post #124. If they're in any doubt, they will be able to check against their playlist.