At 09:30 PM 08/19/08, you wrote: >On the VXR-7000, the RJ45 pins 1 and 2 are the collector and emitter >respectively of an optoisolator that changes state when the squelch is >broken and the correct pl/dpl is used. www.jammerdave.com/vertex.html >says to connect the pin 1 to the pl detect of the repeater controller >and pin 2 to ground. He also says it is basically an open collector >circuit. > >I tried step 1 and no luck. I then connected a 33k pullup resistor >between 12v and pin 1. I took pin 2 to ground. I keyed the HT on the >correct freq and pl and lo and behold, pin 1 dropped to ~1.3 volts. >Problem is, my controller needs to see more like 0 volts. I looked in >the service manual and it looks like there is a zener keeping pin 1 at >1.3 volts or higher. > >Any ideas???? > >- Jerry K8CMI
Two series diodes plus a 2.2 K resistor to the base of an NPN transistor. Emitter grounded. A 4.7 K resistor from the collector to +5vDC. The collector also feeds the input of your repeater controller. Then a writeup to repeater-builder Mike WA6ILQ
