ml wrote:
i have 150ft of 16ga cable going to my roof sgc tuner
my astron is putting out 13.8v in my shack
given the gauge of the wire and distance etc
what would i expect the voltage to be up at the roof?

Depends on how much current you are drawing.

Quoting from my SG-230 manual: "SGC does not recommend
installing the Smartuner more than 100 feet from the
transmitter ..."

300 ft. of stranded #16 has a resistance of about 1.3
ohms at 20 degrees C. My SG-230 draws about one amp.
--
73, Cecil http://www.w5dxp.com