Re: Serial+power over single coax cable
From: Joerg (notthisjoergsch_at_removethispacbell.net)
Date: 01/20/05
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Date: Thu, 20 Jan 2005 22:53:03 GMT
Hi Dejan,
>I need to transfer ca. 5MB/S over coax cable, that should simultaneously
>be used as a power supply line. There would be several stations, LAN-like...
>Any suggestions?
>
>
Power should not be a big deal with coax but make sure it's all fused
and protected.
As to data I'd modulate it onto a carrier, probably FM if it needs to be
cheap. I'd pick a band where the likelyhood of interference is lowest,
preferably ISM like the 900MHz band. Just in case somebody makes a
mistake, a connector shell comes loose etc. That has the other advantage
that you'll be able to obtain cheap HW. You may then want to go with
whatever modulation scheme the popular chipsets use.
You could probably even go 2.4GHz where HW is really cheap but that is a
challenge for longer cable runs and for the distribution and router
circuitry. Just resist the temptation to leave it all at baseband. That
can cause serious susceptibility. I have seen lots of grief in
non-twisted baseband data cables, such as 'it all works unless somebody
uses the elevator...'.
Regards, Joerg
http://www.analogconsultants.com
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