Pro 97 not working
If you have NO volume, and the squelch will not open up, the antenna is NOT the problem. Even with no antenna connected you will still hear white noise when the squelch is opened. The most common audio problem on this type of equipment is the failure of the shorting bar to make contact on the earphone plug. This is the spring clip that disconnects the internal speaker when you plug in an external speaker.
A quick check by plugging in an external speaker that is known to be good. If sound returns, that is the problem.
On the contrary, if it scans and does not stop on a known signal, like the weather channel that is broadcast 24/7, that could be a antenna problem.
Sounds like two different issues. Read More At : Pro-97 Handheld Scanner...