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Low Earth Orbit
Lighting & Electrical
Lighting system causes buzz/hum in the circuit breaker panels
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<blockquote data-quote="Mike Sokol" data-source="post: 73887" data-attributes="member: 1989"><p>Re: Lighting system causes buzz/hum in the circuit breaker panels</p><p></p><p></p><p></p><p>I used to think it was all about the shielding... but then I got to use some InstaSnakes which are basically XLR to RJ-45 converter boxes that use UTP (Unshielded Twisted Pair) CAT5 wiring to run mic-level signal. </p><p></p><p>See <a href="http://www.markertek.com/CATV-Headend-Interface/CAT-5-Transmission-Systems/Audio-Over-CAT5-Systems/Energy-Transformation-Systems/PA202F.xhtml" target="_blank">Energy Transformation Systems ETS InstaSnake PA202 Series 4-Channel Phantom Power Compatible CAT5 XLR Audio Baluns Audio Over CAT5 Systems at Markertek.com</a></p><p></p><p>Believe it or not, but I've run InstaSnakes with mic level signals over several hundred feet right along side a bunch of power cables. It's all about the CMRR of the balanced input stage, and an audio transformer typically has a GREAT Common Mode Rejection Ratio. That's why the phone company could run unshielded twisted pair for thousands of miles across the country with reasonable fidelity and S/N ratio.</p><p></p><p>Interesting, isn't it?</p></blockquote><p></p>
[QUOTE="Mike Sokol, post: 73887, member: 1989"] Re: Lighting system causes buzz/hum in the circuit breaker panels I used to think it was all about the shielding... but then I got to use some InstaSnakes which are basically XLR to RJ-45 converter boxes that use UTP (Unshielded Twisted Pair) CAT5 wiring to run mic-level signal. See [URL="http://www.markertek.com/CATV-Headend-Interface/CAT-5-Transmission-Systems/Audio-Over-CAT5-Systems/Energy-Transformation-Systems/PA202F.xhtml"]Energy Transformation Systems ETS InstaSnake PA202 Series 4-Channel Phantom Power Compatible CAT5 XLR Audio Baluns Audio Over CAT5 Systems at Markertek.com[/URL] Believe it or not, but I've run InstaSnakes with mic level signals over several hundred feet right along side a bunch of power cables. It's all about the CMRR of the balanced input stage, and an audio transformer typically has a GREAT Common Mode Rejection Ratio. That's why the phone company could run unshielded twisted pair for thousands of miles across the country with reasonable fidelity and S/N ratio. Interesting, isn't it? [/QUOTE]
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