[Elecraft] K3 Audio monitor delay

[Lyle Johnson]

> I've not noticed any significant delay in the TX monitor, and I know I
> would find it disconcerting if it was there. Not sure if TX EQ, or
> some other option, might introduce such a delay.

The delay is due to: audio input anti-aliasing filter in the A to D, TX 
AF filtering, phase shift network, interpolation filter (conversion from 
12 kHz sampling rate to 48 kHz sampling rate) , post-IF clipper filter, 
decimation filter (conversion from 48 kHz sampling rate to 12 kHz 
sampling rate), reconstruction filter (part of the D to A).

We thought it best to allow you to hear the effects of the IF signal 
processing, so delays are unavoidable.  Most people do not notice as the 
K3 uses filters optimized to minimize delays.  Note that Tx EQ adds zero 
additional delay. Like the Rx EQ, the Tx EQ just adds more constraints 
to the AF FIR filter generator.

There may be opportunity to further redice delays by combining some 
filter functions.  One of the items on my list of background tasks :-)

73,

Lyle KK7P