[jerryhawthorne]

Len, listen to them. I know some have said they can do it by ear on a radio station, my ears are not that good. The problem with listening to a radio station and trying to peak the IF is that their signal (sound) is not continuous. Same with peaking on a low and high frequency for RF. It goes up and down with the programming. Take a look at it with an analog meter on your speaker and you will see it fluctuate. Not good for finding a peak. What a sig gen will do for you is provide a consistent tone at the IF frequency or the RF frequency, that will make it easy to peak the sound (tone) coming out of the radio and your meter will provide you an accurate way to peak them. You can try the same with a DVM but the rapid change in the digits will drive your brain crazy. Both will work, one easier than the other.
Regards, Jerry