Thanks for the report Colin. I've noticed a similar frequency shift on the last few passes also. Not sure of the cause though.

As a side note, I've actually found that it's easier to clean up recorded audio files with Audacity if the CW audio frequency is higher than what I feel comfortable listening to. It just seems easier to filter out the noise and then change the pitch if need be.

Jonathan Wagner, KE5FSG

Colin Hurst wrote:

Signals over VK were very good. Clean crisp CW. Frequency was 4.6 kHz higher. making nominal at 435.2496. Colin VK5HI.