Re: Serial+power over single coax cable

From: Paul E. Bennett (peb_at_amleth.demon.co.uk)
Date: 01/21/05 

Date: Fri, 21 Jan 2005 18:29:03 +0000

CBFalconer wrote:

> No, the first problem is to find out if the system has any chance
> of working. To illustrate, lets assume the cable is RG58U, 100
> meters long, with a station every 10 meters requiring 12V at 1 Amp,
> adding up to 10 Amps total. Now I don't know that the ohms / meter
> are for RG58U, but I seriously doubt that it can carry the net
> current to deliver that power, and even if it does the ohmic drops
> will be such that local regulators are needed, etc. etc.

Considering that working up a SPICE model of multiple nodes does not take
that long to do, this would answer such questions quite rapidly. It would
also allow exploring a number of options of ideal supply voltage and
current. 

-- 
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