[eagle] Re: PAVE PAWS EMI

Juan Rivera juan-rivera at sbcglobal.net
Mon Sep 3 11:32:05 PDT 2007


Dave,

The noise blanker is off and when you think about it, it doesn't matter
anyway since I'm pulling the 10.7 MHz 3rd IF out of the TS-2000.  The noise
blanker is implemented in DSP farther downstream.  I'm not sure what is
causing that.  I'll have to scratch my head some more...

Juan

-----Original Message-----
From: Dave hartzell [mailto:hartzell at gmail.com] 
Sent: Monday, September 03, 2007 10:58 AM
To: Robert McGwier
Cc: juan-rivera at sbcglobal.net; David Smith; Dave Black (Work); Dave Black
(Home); eagle at amsat.org; Samsonoff at Mac. Com; Juan.Rivera (Work)
Subject: Re: [eagle] Re: PAVE PAWS EMI

Attached is a Matlab plot of Juan's SDR-IQ PAVE PAWS capture...

In the plot, you can really see the noise-blanker suppression after
each spike...

Dave



On 9/3/07, Robert McGwier <rwmcgwier at gmail.com> wrote:
> Juan Rivera wrote:
> > Hi Dave,
> >
> > I noticed that too.  I killed the AGC but didn't think of the noise
blanker.
> > I'll take a look and try again if it was on.  Right now I can't
communicate
> > with the CAN-Do module or I would switch to the 70 cm prototype receiver
and
> > repeat the test.
> >
> > Juan
> >
>
>
> Yes, please.  I have some interesting noise blanker stuff I want to work
> on to eliminate PAVE PAWS pulses on board the SDX transponder.  This is
> the PERFECT set of signal collection (SDR-IQ of IF) for doing that work.
>
> Thank you very much once again Juan for your extremely valuable
> contributions and your unbridled enthusiasm.  It is very welcome indeed.
>
> Bob
>
> --
> AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
> TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
> "If you're going to be crazy, you have to get paid for it or
> else you're going to be locked up." Hunter S. Thompson




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