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Forums » Industry Forums » Wireless Service Providers » Min Distance from VHF Antenna
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lutful
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join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..

Re: Min Distance from VHF Antenna

said by sporkme See Profile :

Curious, what's the spectrum that ethernet uses (100MB FE)?
Fast Ethernet transmission uses 125Mbps "raw" data rate which is carried in a 62.5Mhz "MLT-3" waveform.

There is not much VHF coming out of properly twisted portions of the cable - most noise is coupled in the small untwisted section near the connectors.
permalink · 2006-11-13 02:42:42 · Print · Reply to this

sporkme
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Re: Min Distance from VHF Antenna

said by lutful See Profile :

said by sporkme See Profile :

Curious, what's the spectrum that ethernet uses (100MB FE)?
Fast Ethernet transmission uses 125Mbps "raw" data rate which is carried in a 62.5Mhz "MLT-3" waveform.
So you're saying that ethernet is centered at 62.5 MHz or goes from "0"-62.5MHz?
said by lutful See Profile :

There is not much VHF coming out of properly twisted portions of the cable - most noise is coupled in the small untwisted section near the connectors.
I was thinking more about RF from other sources getting into the ethernet cable and providing a hard to diagnose failure or near-failure.

So anything with a strong harmonic that lands somewhere below 100MHz could be bad news, right? Technically, ethernet is RF, correct?
permalink · 2006-11-14 00:28:36 · Print · Reply to this
lutful
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join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..

Re: Min Distance from VHF Antenna

Here are various Ethernet baseband spectrum. Properly twisted CAT5 cable has 50-100dB VHF rejection.
permalink · 2006-11-14 01:50:54 · Print · Reply to this
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