So you have an old tube-type transmitter as a backup. It ran perfectly when you last turned it on two years ago to substitute for your then-ailing solid-state main transmitter. Now you need it again.

You can purchase test equipment that will allow you to examine the loop gain and loop phase properties of an operating feedback loop and, that purchased equipment will deliver useful results over a ...

I have written in the past regarding air chains, and how to eliminate single points of failure (SPOF). I’m a fan of using multiple, parallel air chains, but each should be simplified as much as ...