Other useful Motorola Reference links
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A Fast Squelch Mod for the GM300 and M120 when used as radio links:
 http://www.sbszoo.com/ve6sbs/projects/gm300/ 

The Bible for Motorola Models and Reference info: 
www.batlabs.com

Repeater-Builder is loaded with lots of action packed material with Maxtrac info at:
http://www.repeater-builder.com/maxtrac/maxtrac-index.html

Another optional IRLP cable from Jay KP4EOP http://www.gpscables.biz/7.htm

Die-hard batwing fans might think this borders blasphemy but another common IRLP link used is the GE-Phoenix.
Here is KG4LNE's fine Phoenix resource: http://www.rtzaudio.com/kg4lne/phoenix.asp