Does anyone know of a moderately priced modulation meter that can be used to roughly set up a radio? I'm talking about something that goes into the coax antenna line and somehow samples the audio. I've seen Dosy meters with the modulation option on them, but then I'm paying for a bunch of other crap that I don't want. I have a great Daiwa 901 in line all the time, but I was looking for something I could add inline for a few minutes to set my mic gain and then remove.