It's been 30 years since I had one of those switches. However, it is
a stepping relay driving the switch wafer with a second control wafer
that opens +12V to the stepping coil when the correct position is
reached.
1) check the "return" (common) wire and make sure it is not open.
2) check/clean the contacts on the control wafer
3) apply relay voltage directly to the stepping relay coil to
make sure the relay steps (coil is not bad).
It may help to take the control unit to the base of the tower and
use a short cable for testing.
73,
... Joe, W4TV
On 2014-07-11 9:03 AM, Keith Neighbors wrote:
My antenna mart remote antenna switch model # sw7, (this is the
successor to the W0MLY switch) suddenly does not work...the control box
in the shack indicates proper antenna when switched but unit at base of
tower does not rotate to indicated antenna...I can manually rotate the
switch so it is not binding....any help to point me in the right
direction to start troubleshooting will be appreciated.
73
Keith, W4HHN
kneighbors at grek dot com
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