September 1997 QST, K9AY relay and switch box.
Usually done with two DPDT relays (giving 4 possible permutations) rather than
three SPST relays.
Google will find you many slight variations of the remote relay and station
controller boxes showing different ways to couple in the control voltage over
the coax. Some use chokes others use transformers. Some use autotransformers
and some use isolation transformers. I use isolation transformers at both ends
of CATV 75 ohm coax.
Tim N3QE
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of David Cole
Sent: Tuesday, March 26, 2013 4:49 PM
To: topband@contesting.com
Subject: Topband: Voltage along coax feeder
Could anyone please point me in the direction of a circuit to feed +12 -12
and AC along the feeder to my beverages to switch 3 relays - thanks all from
Dave in the UK All good topband ops know fine whiskey is a daylight beverage.
_________________
Topband Reflector
All good topband ops know fine whiskey is a daylight beverage.
_________________
Topband Reflector
|