Nope, the knobs and switches on the front of the radio. Squelch and RF Gain are the most important. One will cut out the noise by limiting the minimum signal level needed to open squelch (it’s like a, RF must be at least this strong before I’ll reproduce it setting). The RF gain is adjusts the sensitivity of the signal. Essentially, you want it to be high enough to amplify weak signals but low enough that it isn’t amplifying the noise.
A basic radio setup:
- With the engine off, squelch turn squelch and RF Gain all the way counter clockwise. Noise Blanker and ANL should be off. Tune to a unused channel.
- While watching the signal strength meter, begin to turn your RF Gain clockwise until the needle just begins to move (that’s the point which you are amplifying the noise) and back it off just a smidge.
- Turn the squelch clockwise until the noise coming out of the radio cuts out. Then continue to turn it just a smidge more (1/8th turn or less).
- (Gentlemen) Start your Engine(s).
- If the noise comes back, toggle the noise blanker and ANL back on and see if it goes away. If not, readjust your squelch with the engine running.