[Elecraft] K3 noise reduction

[Lyle Johnson]

> Surely there is need for TxEQ - for example with WSJT mode to compensate 
> different levels from souncard and possible filter influence for all 
> tones to set equal power-out.

The TxEQ adjustment frequencies are set for voice operation.  They are 
the same setpoints as used in the W2IHY 8-band EQ.

They are probably not in the right places to compensate for whatever 
ripple might be in the subsequent crystal filters in the Tx Path.  Also, 
such compensation would change with USB/LSB operation, and is not easily 
observable by the operator of the Tx, so might not be straightforward to 
set properly.

Any mode that is designed for robust, or weak signal, HF data operation 
should have allowance for slight amplitude and phase variations, since 
that is a normal part of HF signal propagation.

> I do not remember if TxEQ settings is stored via mode or not.

They are not, nor are Rx EQ settings, at present.

73,

Lyle KK7P