Edward Dickinson, III-2 wrote:
The outboard accessories mentioned here work with only a single source of
noise, as I understand them. Is it feasible that a noise canceling unit
could be designed to utilize two or more sense antennas for multiple noise
sources?
You could use a separate
Bill -
I'm all for the latter suggestion! I had that 25 years ago. At present,
there are just a couple of dozen obstacles to overcome to return to similar
circumstances. J
73,
Dick - KA5KKT
PS I don't have the 2nd receiver.
I'm rather surprised that nobody has noticed the connection between this
discussion and the one we had a few weeks ago about using the two
phase-locked receivers in the K3 for directional nulling. It's really
the same thing feed separate antennas into the two receivers while
in
The outboard accessories mentioned here work with only a single source of
noise, as I understand them. Is it feasible that a noise canceling unit
could be designed to utilize two or more sense antennas for multiple noise
sources?
73,
Dick - KA5KKT
- The human condition will improve
la3rk wrote:
Check the following pages www.pa0sim.nl. As far as I can tell this
gentleman has done exactly what you suggest, ie he used two K2 receivers
phaselocked and each fed with separate antennas. Output to separate AF
channels and software to null noise by phase and amplitude
At 10:06 PM 11/29/2010, you wrote:
Noted your comment on noise reduction by phase nulling. Have you
looked on info on pages by pa0sim, see www.pa0sim.nl, he has done
more or less what I think you are considering. Ie connecting the
output from 2 phase locked receivers fed with separate antennas
There is also the issue that the various AGC's may be varying the amplitude,
so the process would have to address both instant amplitude and phase to
affect cancellation. Should be able to program that, though. How hard to
code, who knows???
73, Guy.
On Sun, Nov 28, 2010 at 1:15 PM, Edward R.
As I understand the operation of the phasing noise cancellation
units, they have both phase and amplitude adjustments. I'm sure that
can be done digitally. How difficult, what issues? Have to leave
that to the SDR experts. If not feasible, no harm in asking.
***
BTW I home-built a
Dick,
Most of the noise cancelling systems reverse the phase of one of the
antennas and feed the combined result to the receiver, If the noise
antenna receives only noise, the noise will disappear and only the
signal will be present, but in practice, the noise antenna picks up some
signal
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