John Aldrich wrote in a message to Bruce LeGrande:
(About prefering STP over UTP in an RF environment)
 JA> *shrug* I work for a TV station whose transmitter was at the same
 JA> location as the offices and studios (we *just* moved thanx to new
 JA> ownership. ) The new owners strung UTP along the hallways to a
 JA> hub and from there to a network printer. We never had any problems
 JA> with RF into or from the LAN. 
Wow!!!  And the transmitters were actually IN the same building as
the network ???  Not in a seperate block-house ???  How much distance
was between the area where the LAN was and the actual transmitter
itself ?!  I can't imagine a tech not keeping those two things as
FAR away from each other as possible, by at least housing the xmtr
in an RF tight box perhaps on the roof - near the antenna so the
transmission line (coax) could be as short as possible ?!?
Of course, if you're talking about a studio that uses a satellite
network to broadcast and the only xmtr is the uplink at the giga-
hertz level instead of a groundwave array, then I can understand
why there is no problem with RFI.
Also, the frequencies that TV are at is quite a bit higher than
that of Shortwave and Amateur HF stations (1.8 - 29 Mc).  Plus,
I imagine that the 'mode' (FM vs SSB/AM) has a lot to do with
S:N ratio.   I have a UPS here that puts an S-8 noise signal
on my shortwave receiver (both the Yaesu AND the DX-380) in
ALL bands.  It's not some cheap UPS either, it's an Exide 600va
'top-o-the-line' that cost me about $1/VA (just to explain how
susceptable the lower freqs are to manmade RFI (QRM)).
It's not until I get at LEAST a block (300 yrds) away from the
house that the noise falls into the static level.
I figured since the NIC actually has an oscillator and is basically
an RF tranceiver (unless "T" is much different than "2"), they would
be a VERY harmonic 'rich' source...
 BL> I've been able to minimize the RFI from the computers themselves
 BL> by extreme measures of shielding and grounding, and I don't want
 BL> the LAN to be a new source of noise.  So, stray RF is my main
 BL> concern and reason for prefering STP.  Do you still disagree ?  ;)
 JA> I'd suggest you pop over to the Broadcast echo and check with them
 JA> about whether this would be a problem...I'll forward a copy
 JA> there...maybe someone there can KNOWLEDGEABLY comment on your
 JA> unique problem... :)
Thanks John, I'll AFix that echo right away.
It's been a couple years since I carried it here.
Sincerely,
           Bruce - kb6lwn@juno.com - ck@saber.net
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