Re: [K3] Diversity Reception and Antenna Directivity
Posted by
KK7P on
Sep 16, 2010; 6:35pm
URL: http://elecraft.85.s1.nabble.com/K3-Diversity-Reception-and-Antenna-Directivity-tp5537531p5539853.html
> 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
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