Ian wrote:
> Did Rob comment on pops and transients generated in the AGC and DSP?
>
> That was the subject of his presentation at Dayton 2007, where he gave
> many examples to show that "New IF DSP designs [can] seriously
> exaggerate transient noise on weak signals... Some DSP radios make QRN
> much worse."
>
> He also said, "I can’t wait to listen to the K3 to see if they got it
> right." And...?
According to Rob, we did "get it right." He told us that his test pulse
resulted in essentially no upward S-meter movement or AGC activation.
(Rob mentioned that he'd be adding a column to his table to indicate
which rigs pass this test and which don't.)
To achieve this, we created a DSP algorithm that can tell the
difference between transient pulses and useful signals, over a fairly
wide amplitude and duration range. Obviously you can't remove all such
transients -- some have complex waveforms and long durations and are
better dealt with using a combination of noise blanking and noise
reduction. But it works very well on most "shot" events.
73,
Wayne
N6KR
---
http://www.elecraft.com_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com
Locked
