If you don't have a freq counter you can transmit into a dummy load and scan the 2m band on a scanner (if you have one) and when you here the loud squeal of feedback you have found the freq! There is also a formula for mathematically figuring it out, it is radio dependant and you need to know the crystal freq (not the tx/rx freq) which is usually stamped/printed on the crystal. G00gle tr22 and see what you can find.