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:[email protected]] On Behalf Of David Cole Sent: Tuesday, March 26, 2013 4:49 PM To: [email protected] 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
