[Elecraft] K3 Harmonic Distortion

[David Woolley]

Rich wrote:
> I am not an audiologist (?) but isn't a harmonic that is 45db below the
> fundamental tone essentially non-detectable to normal hearing?  Kind of why
> the harmonics of a RF carrier are to be 40dbs down.

The transmitter limits are legislative/engineering compromises.  They 
reflect what is achievable at an acceptable price.  For most amateur 
radio operators, at the receiving end, one would want a limit 
independent of output power and maybe 10dB below sky noise, in 10 Hz, at 
the boundary of the transmitting site.

Even unintentional transmitters are allowed a lot more than that by the 
legislation.

As transmitters, amateurs would not want such limits, as they would make 
stations prohibitively expensive, or limited to QRPP.

Note that amateurs experiment with ultra-low bandwidth transmissions, so 
in some case, one might want 10dB below sky noise in 10mHz, or even 1mHz 
(m used correctly).

-- 
David Woolley
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