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does this unit not need an external speaker for pa mode?

or is there a component which is known to go bad with age on a unit like this where i should look first?

i think the speaker is good. the caps appear to be in good shape via visual inspection, i know they mushroom out a little on top when they go. i may show my ignorance here, but seeing as how i dont seem to be receiving any signal (the s/rf pwr meter never twitches) should i trace the wires from...

ok, so as far as i can tell, the mic is fine, where would i look next?

duh, just looked at the mic, its made by cobra. probably a few years newer, but is it safe to assume that any cobra mic is properly wired for any cobra radio?

ok, so there is not a specific place to ground the unit? i didnt see a green screw or anything like that on the back.... there is a three pronged male type plug thing on the back of the unit, i'll look at the schematics in the post above to see about both the mic, and what those wires are for...

ok, so i'm super duper new, how do i see how my mic is pinned? also how do i tell how the unit wants my mic to be pinned?

Hi guys, i am super new to the hobby, and have some questions. I got this for free from a friend, and have no idea what to do with all the knobs/switches. I do not seem to get any reception, but i might be doing things terribly terribly wrong. what i tried was... i have a ac/dv inverter in my...