Lee A Crocker wrote:
I made a few more clips. The effect can be spectactular or very subtle. In
40-E I found on static the source is sort of from a quadrant and so the
notching is very broad. None the less I could get about 3dB of noise
reduction. In 40-F the SWBC is dramatic. The station was very weak. If this
had been a CW station it would have been Q5. Finally in 40-G the AM BC station
is about 4 miles north of my house and extremely strong. The effect is
amazing!! (and the tuning is critical)
As to the static canceling question, you have no real need of using the second receiver,
just make another watch receiver and use the in-band noise you already have contained in
the 192khz base band. I expect this test by Bob is the first step toward that goal.
Once that is accomplished it will be the gorilla of "next killer apps!!!"
73 W9OY
w9oy-sdr.blogspot.com
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Thanks for all of the work and the feedback from all including Jim
Barber, N7CXI . We made the steps in the controls too large. On point
sources that are narrowband for real, it will be fairly sensitive control.
Now that this technique is included in the code, and after we start
doing multirate sampling techniques this week, a pretty thorough
cleaning and optimization will need to be done with all of your inputs.
A raft of adaptive signal processing things are on Eric's board for both
the receiver and the transmitter. Each and everyone of them will be a
significant improvement in radio for us and separate these offerings as
SDR's from traditional radios even more.
This will be crystallized/finalized in DttSP 3 in cgran as Frank makes
it fit the overall architecture.
Bob
--
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"You don't need to see the whole staircase, just
take the first step.", MLK.
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