[BrianBSL]

At the WPI scrimmage, they had the set of 8 crystals available from Radioshack plus the kit one and assigned each team a crystal for the entire scrimmage, because there were only 10 teams (don't ask me how 10 teams ran on 9 crystals, I don't remember, I assume they ran two teams on the kit freq and just switched them when they played each other). No teams used two receivers, although there were 4 disable ports available per side in case teams wanted to (you plug a cord into the tether port when you compete, that disables your controller until the match starts). I would assume at championship they will have to hand out the crystals as teams go on and off the field, which would mean there would be at least 8 different frequencies available for use. I'm not sure what the call is on allowing teams to use two controllers, that would have to come from FIRST.

I would assume teams will have to use tethers in the pit for championship, I believe a representative from FIRST said they were bringing 25 tether cables. We purchased a tether cable for every team at the scrimmage (50ft handset cords were $1 each at the local dollar store and make great tether cables), but didn't end up needing them as every team was using a separate crystal set.

EDIT:

Another note - the crystal kit that they had a the scrimmage only had 8 crystal sets (one transmitter crystal, one receiver Crystal). They did not have 2 transmitter crystals for each team, meaning that they MUST give teams 2 frequencies and allow 2 receivers. It seems pretty crazy to me the way the rules read that teams are only allowed 1 reciever. Also, from what I've leared about FM (although its been a while), it isn't the greatest idea to be running two transmitters modulated to the same frequency and just hope that you pick up the stuff you want to. Unfortunately I don't get the updates because I'm not officially on a Vex team, so I have nothing to base my writings on other than the rules on the vex website and what I saw at the scrimmage.