[Antennas] DC voltage on coax

[Ray Brown]

---- Original Message ----- 
From: "Nelson Wittstock" <k8djc at zoominternet.net>

> I am currently enjoying using a pennant receiving antenna for 160 meters.  I
> would like to add another for a different direction but this means having a
> DPDT relay at the junction of the pointed ends.  I need to get voltage to
> the relay and I would like to do this by routing the voltage through the
> coax feed.  Can someone direct me to a site showing how this can be done?  I
> know I have seen plans for it but cannot find the information now.

  Hmmm. Yes, I know it can be done, one application of putting DC on a
coax line is to run one (or several) signal amplifiers in a hospital's telemetry
system. We have a grid of 11 "branches" with 6 amplified antennas on
each branch. A bit of a mess, but that's how you cover a 350-bed
hospital. :-)  Oh and BTW, the antennas are at 608-614 MHz, which is
why we need amplifiers, a very high loss on small coax.

  I'll see if I can dig up some schematics on the antenna tomorrow.

                _Ray_        KBØSTN