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Go with FM radios...
I'd avoid AM radios with FIRST robots, and go *only* with FM. FM is much more noise immune, and between the microprocessors, and all the electrical noise from the motors et al, IMHO you're just asking for trouble with an AM rig.
Compare during a lightning storm how static filled an AM radio gets, to the quietness and clarity of an FM broadcast, and think about what the robot is "listening to" for its instructions.
- Keith
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Keith McClary - Organizer/Mentor/Sponsor - Ann Arbor MI area FIRST teams
ACTI - Automation Computer Technologies, Inc. (Sponsoring FIRST teams since 2001!)
MI Robot Club (Trainer) / GO-Tech Maker's Club / RepRap-Michigan) / SEMI CNC Club
"Certifiably Insane": Started FIVE FRC teams & many robot clubs (so far)! 
2002: 830 "Rat Pack" | 2003-5;14: 1015;1076 "Pi Hi Samurai" | 2005-6: 1549 "Washtenuts"/"Fire Traxx"
2005-(on): 1502 "Technical Difficulties" | 2006-(on): FIRST Volunteer! 
2009-(on): 470 "Alpha Omega" | WAFL | Sponsor & "Floating Engineer" for MI Dist 13 (Washtenaw Cnty)
2011: 3638 "Tigertrons" | 2013-(on): 4395 "ViBots" | 2014-(on) 66 "Grizzlies"
"Home" Teams: 66, 470, 1076, 1502, 4395
Local FIRST alumni at or coming to Ann Arbor (UM/EMU/WCC/Cleary)?
...We Want YOU as a Mentor! Please email me for info!
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"It must be FRC build season when your spouse and children become 'Action Items 8 & 9'..."
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