Re: [amsat-bb] 100BaseT Woes

["Edward R. Cole" <al7eb@xxxxxxxxxxxxx>]

Emily,

I use the same model router in my radio room.  My internet service provided
me with cat-5 (unshielded 6-foot cables to use with it and the DSL modem).
I am also using linksys LAN cards 100baseT in two computers in the same
room.  My FT-847 doesnot seem to be picking up RFI on VHF from the network.
 I have not explored the UHF or HF spectrum thoroughly so cannot comment
there.  I had considered shielded cat-5 cable and am assured it exists.  I
specifically checked the satellite freqs and my eme band.

One thing in my favor is the use of good quality 8jk phone lead-in and I
installed the ground rod at my power/teleco terminal boxes!  The original
ground rod had corroded in half!

GL
Ed - AL7EB

At 09:39 AM 1/29/2004 -0500, Louis A. Mamakos wrote:
>
>It's VERY unlikely that you'll find any Category 5 cable that's shielded.
>Almost universally, ethernet over twisted pair uses Unshielded Twisted Pair
>(UTP) cables.
>
>The ferrite core approach might work, though.  I think you can buy 
>these from Radio Shack.
>
>louie
>wa3ymh
>
>> Are you using cat 5 cable?  It should be shielded.  You might try a
>> different length of cable...  Maybe the cable you are using is a perfect
>> antenna...  I've never tried iron ferrite coils for networks but that
may be
>> an option as well...  Hmmm...
>> 
>> 73s,
>> Eric KF4OTN
>> 
>> AMSAT Member: ?
>> TAPR Member: 8869
>> 
>> 
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>> -----Original Message-----
>> From: Emily Clarke [mailto:w0eec@AMSAT.Org] 
>> Sent: Wednesday, January 28, 2004 15:51
>> To: amsat
>> Subject: [amsat-bb] 100BaseT Woes
>> 
>> 
>> I hope someone has found an answer to this because this is driving me nuts.
>> 
>> I have a LinkSys BEFSR41 100BaseT Router, and it's totally whiping out 
>> 145.800 (The ISS downlink frequency) at about 60 over S9.  I know it's the 
>> router and cabling because if I disconnect the twisted pair cabling into 
>> the shack everything drops down to about S2 (the rest probably coming from 
>> the router and the cable the server, both in the garage.
>> 
>> Is there any way to keep this stuff out of my shack short of running into 
>> the garage and cutting power to the router when the ISS comes 
>> around?  Seems extreme to do that.  I'm thinking maybe there are shielded 
>> cables or filters that can be added?  Perhaps I need to add a grounding
lug 
>> to the router and ground it directly to the same ground as my rig?  I'm 
>> willing to swap out the router too if I can be sure that will solve the 
>> problem.
>> 
>> 73,
>> 
>> Emily
>> 
>> 
>> 
>> ---------------------------------
>> W0EEC - CM87tm
>> AMSAT Area Coordinator - San Francisco Bay Area
>> http://www.projectoscar.net    http://www.PlanetEmily.com 
>> http://www.experthams.net/ao7
>> 
>> Help Launch Echo - http://www.amsat.org/amsat/sats/echo/index.html
>> --------------------------------- 
>> 
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