Hello Bruce!
Tuesday March 10 1998 21:42, Bruce LeGrande wrote to John Aldrich:
 BL> Wow!!!  And the transmitters were actually IN the same building as
 BL> the network ???  Not in a seperate block-house ???  How much distance
 BL> was between the area where the LAN was and the actual transmitter
 BL> itself ?!  I can't imagine a tech not keeping those two things as
 BL> FAR away from each other as possible, by at least housing the xmtr
 BL> in an RF tight box perhaps on the roof - near the antenna so the
 BL> transmission line (coax) could be as short as possible ?!?
Well...the closest LAN cable was probably about 50-100 feet (as the crow 
flies) from the UHF 53 transmitter...but the actually Xmitter was on a TALL 
tower outside (of course.)
 BL> Of course, if you're talking about a studio that uses a satellite
 BL> network to broadcast and the only xmtr is the uplink at the giga-
 BL> hertz level instead of a groundwave array, then I can understand
 BL> why there is no problem with RFI.
Nope...no satellite uplink at that site.
 BL> Also, the frequencies that TV are at is quite a bit higher than
 BL> that of Shortwave and Amateur HF stations (1.8 - 29 Mc).  Plus,
 BL> I imagine that the 'mode' (FM vs SSB/AM) has a lot to do with
 BL> S:N ratio.   I have a UPS here that puts an S-8 noise signal
 BL> on my shortwave receiver (both the Yaesu AND the DX-380) in
 BL> ALL bands.  It's not some cheap UPS either, it's an Exide 600va
 BL> 'top-o-the-line' that cost me about $1/VA (just to explain how
 BL> susceptable the lower freqs are to manmade RFI (QRM)).
 BL> It's not until I get at LEAST a block (300 yrds) away from the
 BL> house that the noise falls into the static level.
Hmm...that sucks.  You really might want to try discussing this in the 
"Braodcast" echo...they're the ones who have the sort of knowledge. :)
 BL> Thanks John, I'll AFix that echo right away.
 BL> It's been a couple years since I carried it here.
Well, there's some really knowledgeable ppl there...maybe someone can help 
you.. :) I've about reached the limits of my hardware knowledge... :)
        John
... "There's a Bobcat Under the Outhouse!" by Claude Balls
--- GoldED/386 2.50+ 91LM1
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