Hello All, Thanks for the replies and I hope your enjoying your new year!
Ok, I am pleased with the response that you have all given including the technical details provided by niteflite01 (I am sure we have met before?
) - Just goes to show after many years of doing the job you can still remember the knowledge!
The receiver i have used is of a good make, and I am sure its nothing todo with it being set incorrectly as after taking your advice i recently tuned into a local ATSU Providing FIS to hear the same aircraft that a normally hear having the same distorted radio quality! It appears, or should that be sounds to me, that the radio or headsets are ''over modulating'' the radio transmission
Anyway thanks for your comments and look forward to any more replies
Edited to remove identity of aircraft