So far as I know, there's no chirp on my cw signal.
What I actually get is an rf, not really a shock.
I can't tell about hum from my dummy load because I'm too close to the
transmitter. However, rf shock is reduced but not eliminated.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html