Irv

The Yaesu FRG-7 has an analog VFO, as I recall. Hence, it will jiggle and wander in freq unless there is a dial lock, which I doubt. Might sound funny on rough roads too, if you're listening to ssb and the VFO coils are jiggling around. It also lacks an effective noise blanker. It might have a noise limiter, but they aren't worth much. Ignition and/or alternator whine might be an issue, too. Is your vehicle a diesel? If so, forget what I said about ignition noise. Irv