[DSP-10] CW transmit has a raspy sound

[David and Brenda Holman]

Mike and all,

The 120 Hz you are seeing could very easily come from fluorescent 
lights.  This is a very common problem. 

David, KE3HF




kd7ts wrote:

> hello interested parties...
>
> When I displayed the Lees wave files on a waterfall I saw 120 HZ 
> signals nicely spaced, and easily observed.
>
> Thinking back to A.C. power supply theory, we have different ripple 
> frequencies with different rectifier schemes, half wave, full wave and 
> bridge. I'm a little hazy on this stuff, but would a magnetic field 
> generated from 60 CPS mains have a 120 CPS effect ? Maybe there is a 
> way to generate a 120 HZ magnetic field ?
>
> I just tried holding my Weller solder gun next to the DSP-10, and I 
> see spurs every 60 cycles, not just every 120, when I pull the 
> trigger. ( I was watching a signal from my generator at 144.000600)
>
> I wish I had an answer, but instead, more questions..
>
>
> Mike KD7TS
>
>
>
>
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