At 5:30 PM -0700 7/23/98, N3SL@aol.com wrote:
>To add to RR's comments: The Ameritron box that uses the coax switches
>between 4 possible antennas. These are selected by no voltage, +12, -12, and
>12vac. Not only does the PolyPhaser block the DC, it blocks 60 cycle AC, so
>your Ameritron setup will not work at all with those PP units. I just went
>through all this and decided to use the 5 position Ameritron, which requires
>its own cable.
This was a decision process I had to also go through when I installed my
tower-mounted Ameritron switch. The problem then becomes how to ensure
that lightning doesn't follow the control cable down into the shack.
Polyphaser also makes shunt protectors for 8-conductor cable. I used one
at the top of the tower and another at the ground window entrance to the
shack. For a photo of the ground window, see the bottom photo on
http://www.qsl.net/w6old/partyinstall.html. There are two of these control
cable shunt protectors in the top right corner.
73, Dick
--
Dick Flanagan W6OLD CFII Minden, Nevada DM09db (South of Reno)
Visit http://www.qsl.net/cvrc/
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|