[eagle] Re: PAVE PAWS EMI

Juan Rivera juan-rivera at sbcglobal.net
Mon Sep 3 18:47:00 PDT 2007


We spent the afternoon trying to characterize the pulses that I see here
with my antenna pointed north.  See my last plot for details:


You'll see several evenly spaced areas showing many hits over about a 30
minute span.  They are too evenly spaced to be random but they don't conform
to the PAVE PAWS band plan that I pulled from environmental impact reports
from years ago.  Because of the recent push to clear ham repeaters off of
the air anywhere in the vicinity of a PAVE PAWS site, we know something has
changed, but what?

To resolve all of our questions we'll need to move to an unobstructed
location atop a local mountain and try again.  That will take a few weeks.
Until then I would be cautious about using my .wav file.  It might be the
neighbor driving around the block on his Harley.

73, Juan

-----Original Message-----
From: Robert McGwier [mailto:rwmcgwier at gmail.com] 
Sent: Monday, September 03, 2007 10:11 AM
To: juan-rivera at sbcglobal.net
Cc: 'Dave hartzell'; '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

Juan Rivera wrote:
> Hi Dave,
> I noticed that too.  I killed the AGC but didn't think of the noise
> I'll take a look and try again if it was on.  Right now I can't
> with the CAN-Do module or I would switch to the 70 cm prototype receiver
> 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.


AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
"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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