[Elecraft] AF1 - Practical Use Question

[Ron D'Eau Claire]

The "buzz" is interesting. With the tight bandpass, the sidetone (and
received signals) from the K3 should be closer to a pure sine wave than
ever. 

Ron AC7AC

-----Original Message-----
Don, I don't have any of that fancy equipment unfortunately.  But I just 
met with success anyway!

I was expecting to hear a "pure" sidetone - what I hear is a buzzing 
sound along with some modulation that sounds reasonably close to the 600 
Hz I set.  When I took my hand away from the AF1, the buzzing stopped 
and the sidetone, still sounding just a little bit constricted in the 
BP2 position (not nice and pure and loud like in the barefoot K2) was 
completely reasonable and useable.