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
Hello Edward,
From marketing point of view, if the noise cacelling mechanism were eventually
implemented in K3 successfully, the sales of KRX3 option would rocket up,
wouldn't it?
cheers,
Johnny VR2XMC
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寄件人﹕ Edward R. Cole kl...@acsalaska.net
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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
OK, I realize the Timewave and MFJ noise cancellers operate at RF and
not AF...But I was thinking of the amazing noise reduction that SDR's
accomplish in the digital relm. I understand it may not be that
simple. But sometimes asking the question gets new thinking going.
For example the
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
Hi Ed,
That's a good question. I've wondered that myself. Perhaps some more
knowledgeable will chime in.
73,
Dick - KA5KKT
Along this line of discussion, I wonder if those who have the KRX3
could use it as 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
I am not familiar with the ANC-4, but I assume it is similar to the MFJ
noise cancellers. Those units are not receivers but work with the weak
antenna signals at the originally transmitted frequencies. Aside from some
signal buffering, such a unit essentially provides the capability to
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