[Elecraft] [K3] Diversity Reception and Antenna Directivity

[Lyle Johnson]

>   Alan has verified your point about relative phase of the two receivers
> changing with frequency, so that indeed would have to be accounted for.

A possible mod would be to feed the main synth to both receivers.  This 
would then only be good for diversity operation, but there would be no 
random phase change when tuning.

The DSPs do not have this relative phase change issue.  The dual A/D is 
driven by one clock on the main DSP board.  The ADC output is fed to the 
Aux DSP, but not clocked by the Aux DSP.  Thus, the sampling offset and 
any delays are fixed and constant.  DSP filter delays are also constant 
as long as you do not use the IIR filters for 100 Hz and 50 Hz 
bandwidth.  I am not certain if the actions of AutoNotch and/or Noise 
Reduction would introduce any relative phase changes -- assuming 
activation in both receivers, of course!

73,

Lyle KK7P