[Elecraft] Re： Diversity Receive as Noise C anceling?

[Bill W4ZV]

Edward R. Cole wrote:
> 
> I'm not sure that adapting the sw for noise 
> cancellation will take that much extra 
> processing.  Reversing phase is a simple digital 
> inversion.  
> 

It's also very simple to do at RF with one of the external phase boxes. 
I've used all 3 of these and rate them in the following order:

1.  DXE NCC-1 (the best but expensive)
2.  MFJ-1025 (very good with W8JI's mods below)
3.  Timewave ANC-4

References:

http://www.dxengineering.com/Parts.asp?ID=1227&PLID=215&SecID=114&DeptID=12&PartNo=DXE-NCC-1
http://www.mfjenterprises.com/Product.php?productid=MFJ-1025
http://www.w8ji.com/mfj-1025_1026.htm
http://www.timewave.com/support/ANC-4/anc4.html

I personally wouldn't give up diversity for noise canceling, but I don't
live on a city lot.  I'd use an external phase box with noise sense antenna
aimed at the noise source combined with an RX antenna via a phasing box into
RX ANT and a second RX antenna into AUX RF for diversity.  Using DSP to do
what a $180 box does reasonably well seems like overkill.  This reminds me
of the Flex Radio guru who proposed a 4 RX/TX solution to what an external
4SQ phase box does for $350...plus you need only one feedline to the
controller instead of 4 to the shack, one 1.5 kW amp instead of 4 each $375
amps, and much less complexity.  "A technical solution looking for an
application" comes to mind.

73,  Bill




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