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Possibly to prevent wrong polarity when hooking them up. But I don't quite see how it would help.
50 ohms across 12 volts is only 1/4 amp, so that would hardly blow any fuse. Maybe the 50 ohm resistor would get hot enough (3 watts) that it would alert the user?
Or to prevent negative spikes during connection/disconnection from the power source from damaging alternator/generator or avionics in the airplane?
Finn
Dave S wrote:
Seen in Rec.aviation.piloting.
Anyone know?
-------- Original Message --------
Subject: What's Inside Aircraft Jumper Cables?
Date: Thu, 18 Oct 2007 09:24:42 -0400
From: Paul Dow (Remove Caps in mail address) <pNaOuSlPdAoMw@cox.net>
Organization: Cox
Newsgroups: rec.aviation.piloting
A friend of mine has some very nice aircraft auxiliary power cables, and
he was going to take it apart and remove the insulation for the scrap
copper. After seeing how nice it is (4/0 stranded cable), he put it back
together, but he noticed something strange. Inside the plug connector
was a 50 ohm resister in series with a diode connected across the two
cables. Copper pins were inserted into the braided wire to make the
connection.
Does anyone know what that is for?
Thanks
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