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.
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