Hello

I went to a local auction where a hardware store and small engine
repair business went out of business. I came home with boxes of small
odds and ends. One box had what I thought was a CB radio, but it
turned out to be a Uniden SMU 300K commercial radio. I have been
googling around trying to find out some info on it, but out of about
40 hits on google, with well over half of them being outdated Ebay
ads, (I sure wish Google would remove outdated junk), I only found one
site with a small photo of one, and no further info.

This is the same radio, as the photo I found.

Anyhow, I am not very familiar with commercial radios. I do know
quite a lot about CB though, so I know this is similar except the
frequency.

What I am trying to find out are a few things. What is these radios
used for? I mean what is the band they use, like is is police, fire,
business only, or what? Several of those obsolete Ebay ads said in
the description they are a UHF 450-470 MHz Mobile Radio (another said
440 - 470mhz.

My next question is legality. Can I legally transmit, or do I need
some sort of license? If I do need one, can I test it without a
license just for a few minutes?
(I am a farmer, live out in the boonies, so there is not much radio
activity around here). I have a police scanner so I should be able to
hear myself. But before I do all of that, I will need the right
antenna. I got several CB antennas but I know that is way off on the
wavelength. I imagine for listening, I can use one just to try it,
but not to transmit.

I am just asking all of this first. I have not powered it up yet, and
for all I know, it could be dead, although it is clean and complete.
I dont want to blow it up so i am asking about it first. I also dont
want to buy an antenna or get a license or anything until I know it
works.

One other thing. I dont see any holes for a speaker. Does the sound
come out of the mic, or what? On the rear there are only the red and
black power wires, the antenna connector, and a square plug with a
jumper wire.

All help appreciated.

Thanks

George