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RE: 100BaseT Woes



A reply to all who haven't heard but I replaced the Linksys router and the 
immediate problem of working the ISS is solved.  But for posterity Mike 
asked these questions, so I'll answer them.

>How far is the Linksys from your antenna/rigs?

slant range is about 15 feet to the rigs and 30 feet to the antennas

>How far is the computer you're using the connect to network from your radio?

6 inches.  But it's not coming from the computer (turn the computer off and 
the noise is still there.  Disconnect the cable from the router to the 
computer and the noise is still there.) However there is another that 
passes 10 feet away at the closest point.

>Where is your antenna in relation to your station?

slant range 18 feet to the mast mounted preamps and 3 feet from there to 
the antennas.

>What kind of coax are you using for your feed to the 2 meter ISS radio?

9913 to the pre-amps, and 6 feet of RG-8X from the preamps to the antennas 
with the extra forming a balun to prevent desensing.

>What kind of shack ground are you using?

Cold water copper pipe on the underground side of the pressure gauge.  The 
pipe goes from the connection point underground in damp soil (we have an 
underground spring in the area) 30 feet to the water meter. - ground cable 
run is about 18 feet from the rig.  (I'm on the second floor.)  After 
entering my shack (home office) it goes to the computer, the 12 volt 
supply, my PCR-1000 and my rig (Icom 910H) in that order.

>I just built a new custom shack from scratch and tried to foress these kinds
>of probelms.  This might need an approach of stepping back and looking at
>the whole setup... I may be able to help

I appreciate it and might take you up on it.  I believe in this case it was 
a defective router but possibly the new router just moved the noise to 
another frequency.   I plan to use the PCR-1000 today to sweep both bands 
once I rig up a sniffer antenna for it.  I am going to have it produce a 
chart and then I'll identify every source of noise in 2m/70cm by turning it 
on and off and seeing if it toggles.  This should go a long way to discover 
what's happening in my local ether.

73,

Emily



>Michael  K3MH
>
>-----Original Message-----
>From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
>Behalf Of Rick Hambly (W2GPS)
>Sent: Thursday, January 29, 2004 9:41 AM
>To: 'Louis A. Mamakos'
>Cc: 'Emily Clarke'; 'amsat'
>Subject: RE: [amsat-bb] 100BaseT Woes
>
>
>Louie,
>
>Not so!  I bought a 1000' reel of SHIELDED CAT-5 cable and wired up my whole
>house.  It has worked very well and I've had no EMI/RFI problems either to
>my radios or back into the network from my kilowatt HF and VHF/UHF rigs.
>
>I grounded only one end of every cable, at a common point on the patch
>panel, and from there to the main phone and power grounds for the house.
>Thus there are no ground loops.  Patch cables are not grounded.
>
>The cable I am using is Tyco/Madison Cable, PN 08KFJ00003, Spec #4440 Rev %.
>Apparently that part number is no longer available. But Joel at The RF
>Connection thinks he can get it or the equivalent in 1000 foot reels.  See
>www.therfc.com.
>
>Rick
>W2GPS
>
>-----Original Message-----
>From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On Behalf
>Of Louis A. Mamakos
>Sent: Thursday, January 29, 2004 9:39 AM
>To: Christensen, Eric
>Cc: 'Emily Clarke'; 'amsat'
>Subject: Re: [amsat-bb] 100BaseT Woes
>
>
>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
> >
> >
> > All contact logs are uploaded to the ARRL LoTW and eQSL.
> >
> > ----------
> > Tired of SPAM???  Try SpamArrest! It really works!
> > http://spamarrest.com/affl?171510
> >
> > -----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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>
>----
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>
>
>----
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---------------------------------
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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