Sometimes troubles like this are hard to find because you can't be there when it is happening. I have found that a Radio Shack Digital Voltmeter that I have and an old laptop have been handy for such times. I bought an RS DVM with the RS-232 interface on sale a few years ago. I connected it to an old laptop that I have via the RS-232 port and run the simple program that came with the DVM. It records readings over time and stores them to a file. You can then look at the file and see if things have changed over a period of time. I've used it to record AC voltage at sites where I suspected drops in voltage levels and it was helpful to get things fixed. Definitely not lab quality equipment, but very helpful in troubleshooting. This setup could easily watch the 10 volt line or the compensation voltage line.
Just thought I'd pass this idea along. 73, Joe, K1ike On 8/4/2010 8:11 AM, steve wrote: > I am using a PLL exciter with a 5C Icom. I am going to check the 10 volt > supply. I have a couple of 10 volt cards that I will swap out if needed. > > Thank you > Steve >
