"William R. Walsh" writes:

I'd imagine it to be center positive, but I'd like to confirm that
without smoking anything, since I've wanted to listen to satellite
radio for some time.

The manual's available from he
http://shop.xmradio.com/xm/ctl10600/...845/cl1/skyfi2

It says "Power: 6V, 1000 mA maximum current, P13 connector, positive
polarity" (with a picture of a centre-positive connector).

--
Adam Sampson http://offog.org/