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Re: Unknown sounds


Thanks, I was pretty sure it was LAN noise - unfortunately I didn't take the
time to test to see by turning the LAN off.

Thanks for the tip on the shielded cable - I'm about to replace my runs up to
the roof with 7/8" and 1/2" hard-line for 70cm and 2m respectively, so I'll make
sure to replace the jumpers on each end with some quality cable.


Don Woodward
AMSAT 33535

----- Original Message -----
From: "Randy Mclean" <rmclean@natdoor.com>
To: "Don Woodward" <dbwoodw@alltel.net>
Cc: <amsat-bb@AMSAT.Org>
Sent: Thursday, September 05, 2002 09:37
Subject: Re: [amsat-bb] Unknown sounds

The sounds you are experiencing sounds are from a LAN. I have a Network
switch/hub in the same location at my satellite station and it emits a
large amount of RF. I even switched to a different switch/hub to hope to
stop the noise, but I didn't have any luck (two brands, two models, same
noise). I realized this was going to be a problem before I built my station
so I went with LMR-600 for all my coax. The extra shielding reduced the
noise I was experiencing with 9913/lmr-400. While I can still hear the
noise, its at a level I can now tolerate. I have several ideas for
eliminating it altogether, however I haven't had the time to implement any
of them.

In my case there was a simple way to test my theory about the switch/hub. I
simply unplugged it and the bands went silent

73's de wo5m

At 09:01 AM 9/4/2002 -0400, you wrote:
>I have created a page of unknown sounds that I have heard trying to find
>beacon - the ones I made last night seem to have some sort of CW characters in
>them. Has anyone heard any of these sounds before? I believe they may just be
>computer or LAN noise in my house. The page is located at
>http://kd4app.webhop.org/amsat/unknown.htm .

Randy Mclean
Network Engineer
National Door Industries

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