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I'm trying to figure out why you're using a mic into a pre-amp into a 2m radio. Is that correct? What type of interface are you using between the pre-amp and the radio?

I would think you need to use an interface similar to the w2ihy iBox to take the line level audio down to mic level audio. If you are running a preamp directly into the rig that's most likely where the hum is coming from..an impedance mismatch. It's also possible you could damage the 2m meter radio by doing this. if I'm off base on your setup just disregard, but this it what it sounds like to me.

You also don't make 2m audio "loud" by using power mics or other audio boosters. it doesn't work the same AM and SSB audio does.

[QUOTE="RatsoW8, post: 267816, member: 11356"] I'm trying to figure out why you're using a mic into a pre-amp into a 2m radio. Is that correct? What type of interface are you using between the pre-amp and the radio? I would think you need to use an interface similar to the w2ihy iBox to take the line level audio down to mic level audio. If you are running a preamp directly into the rig that's most likely where the hum is coming from..an impedance mismatch. It's also possible you could damage the 2m meter radio by doing this. if I'm off base on your setup just disregard, but this it what it sounds like to me. You also don't make 2m audio "loud" by using power mics or other audio boosters. it doesn't work the same AM and SSB audio does. [/QUOTE]

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