[NLRS] wierd noise update

[jcplatt1@mmm.com]

Good detective work Bryan ..... "we have met the enemy and it is us".
One of the best ways to start finding noise problems is to put your rig on
battery power (if possible) and pull your main power breaker and see if the
noise stops.   This is always great fun because you get to go around and
reset all the clocks too.

I suspect that your rigs S-meter does not respond to the noise on SSB/CW
like it does on FM because of different AGC attack/decay times between the
modes (as designed by the Engineers) and/or differences in how the IF works
in your radio between these modes.   At my place, the 1296 radar noise is
hard to detect when my 2m IF rig is in CW mode (fast attack/fast decay
AGC), you can tell its there in SSB mode, but sounds really nice when in AM
mode.

73, Jon
W0ZQ




                                                                                                                     
                    "Bryan LaPlante"                                                                                 
                    <bryan.laplante@prag      To:     "Nlrs posting (E-mail)" <nlrs@mailman.qth.net>                 
                    matek.com>                cc:     (bcc: Jon C. Platt/US-Corporate/3M/US)                         
                                              Subject:     [NLRS] wierd noise update                                 
                    02/18/02 09:17 AM                                                                                
                    Please respond to                                                                                
                    bryan.laplante                                                                                   
                                                                                                                     
                                                                                                                     





The loudest packet station is N0NAS-10 on 144.39, which does S9++ here, but
doesn't seem to correspond to my noise.

However, when I flipped the radio to FM mode, I see regular periodic jumps
in the s-meter all across the weak signal band, plus noise peaks of S2-S3
at
several places.  Interesting that the S meter doesn't respond to it on SSB,
but does on FM.  Anyhow with my HT I hunted down some of the noise sources:
1) Laptop on downstairs.  Turned off, still have noise.  2) late last night
I found that a PC in the basement (my firewall) is doing the big noise peak
on 144.0xx.  Not sure if it is just the PC, or is PC + network (100BaseT)
or
just the network.  Strong signal radiating from the network cable.

In the next couple of days I hope to figure out whether it is the network
or
the pc, but it's looking like it is some of my own equipment, in the
basement, that is getting picked up by the antenna (it is somewhat
directional, to the S, my antenna is on the north side).  The way the meter
jumps I'm guessing it is related to network traffic.

73 - Bryan - kb0obt

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