John is the inputs Capacitor coupled? And or are the RX sources DC coupled?
Randy --- In [email protected], "John Transue" <jtran...@...> wrote: > > Our club recently added a remote receiver and RF link to our club > repeater. We are using an ACC RC-850 controller at the repeater site. > We added an LDG RVS-8 voter so we would not have to use PL and to make > life easier for mobile users. > > Now we have a problem. When I set up the voter, the POTs that I must > adjust seem to have step functions, i.e. I can adjust to, say, 500 mV, > then the next slightest adjustment will immediately take me to, say, 3 > V. I put the two receivers on channels 1 and 2 and found the step > occurred in both channels. This was perplexing. I called LDG tech > support and was told that maybe a POT was just dirty even though the > voter is brand new. So I tried again with the same result. Then I > switched the two receivers to channels 3 and 4. These POTs had the > same characteristic. There are two POTs per channel, so the problem is > there for eight POTs! At first blush, this looks as though LDG has a > large supply of defective POTs. > > So my question is, "Is there any way something external to the voter > could cause the voter POTs to behave this way?" I don't want to charge > LDG with using bad components if there is any chance that the problem > is caused by our receivers or controller. I don't see any way the > receivers or controller could cause the problem. What do you all > think? > > John > AF4PD > > PS: The repeater receiver is in a Midland BaseTech II and the link > receiver is an Icom IC-F221S. > PPS: A further problem is that the maximum audio output of the RVS-8 > is not adequate to modulate the BaseTech II transmitter (through the > RC-850) to any deviation above 1.7 kHz. I can solve this with an audio > amplifier or a change to the RC-850, but I would rather that the voter > did the job. This problem, too, could be caused by a bad POT. I am > sorry to say I did not measure the audio voltage out of the voter. >
