.........
If you would have any ideas as to modifying the ANC-4 I would'nt mind
working with you on this project. But I will leave that one up to you.
.........

Sri, I prefer my Digital Signal Processing route with the two Elecraft K2
receivers.
DSP makes an ideal phaser. So no need here for a "better" analog one.
And DSP gives me a lot more tricks to reduce interference and noise.

73 es gl de Jan PA0SIM


May I ask what the tricks are?

Of course:

1) With only one receiver and one antenna:
- Noise Reduction and Noise Blanker tricks as you see now implemented
in the new DSP transceivers like the Orion and the SDR1000 (all the DSP
must be in the AGC loop!).
- In DSP it is possible to make very small bandwidth CW filters.
- For better CW readability one can use binaural or panoramic reception.
- DSP makes multi notch filtering possible (SSB)
- In DSP it is possible to realize almost every AGC you can think of.
(a better AGC can improve weak signal reception)

2) with two (or more) antennas and two phase coherent receivers
- In DSP it is possible to realize the ideal phaser.
- An alternative is "effective directivity" by frequency component selection
see: http://home.plex.nl/~jmsi/Effective%...20by%20DSP.htm
(the audio samples show what is possible with it)
- True Diversity Reception, because both receivers can be made identical.
- Enhanced Stereo Reception can improve readability for CW/SSB signals.

3) and the tricks I dont know yet. I am not a DSP guru.
For example: (Blind) Source Seperation?
see: http://en.wikipedia.org/wiki/Source_separation
Rather complex stuff HI.

Don´t forget that not all DSP in the new tranceivers is well implemented.
Important is to recognize that DSP has a bright future for us.

73 de Jan PA0SIM