CMB 3.102V - Intercom - How to talkback privately to a facilitator's earpiece; how to tune/troubleshoot RF beltpack channels

Press BOTH Call and Talk buttons at the same time and talk while holding.

Release and set CH Select back to CHA to listen again.

Each lab has it's own wireless transmitter. 

The receivers can receive either labs intercom, so make sure the lab you are in is the channel you want to hear.

The transmitter and receiver(s) should match like this:

(BOTH on CHANNEL 1 75.5MHz)

or this:

(BOTH on CHANNEL 2 75.9MHz)