Man, ya really gotta give GOOGLE a TRY.
in less than 5 seconds, I had about 100 links to your HAM MULTIMODE 3 - whatever.. I cut your radio's Name from your post, and pasted it into Google.... BINGO !
there is was....
Photos, circuit board layouts, block diagrams, transceiver specs... Adjustments, PINOUTS, etc etc etc. and that was just the FIRST link I clicked on: http://malzev.tripod.com/cb-funk/ptbm133.htm
There was even more on down the page... and many many more links in GOOGLE... RIPE for your surfin'
Hope that helps...
GO GOOGLE-ing today !