[TowerTalk] wireless rotor

[Jim Lux]

On 3/29/13 8:44 AM, Charles Gallo wrote:
> Which was why I talked about a 12v buss. Picture all your rotors, antenna switches, etc all run on one 12 v buss. 2 wires (or 3 if we are talking about 1wire buss) and you attach to the 12v, and contol goes via the buss, the same way they are doing in cars now. Power is a buss, there is a data buss, and the items listen for a message to them


I would not necessarily use 12V.. the resistance is an issue, so the 
voltage at the load changes with the current. It's the variation that's 
the problem, not necessarily the drop (which you could handle by just 
jacking up the voltage at the source).

There's two strategies I've used:
1) 24 or 48V and DC/DC converters (lots of bricks available, but not all 
are good for RFI.).  Treat the supply as a constant current source and 
use wide input range converters. Typical converters have a 1:2 or 1:3 
range (e.g. 12-36 V)

2) send a isolated, GFI 120V AC..

Isolation transformer and suitable fusing/circuit breakers.

Then you have 120V-12V power supplies up there, linear or switcher as 
you see fit.