Hope to get some info on crystals that will work for the HL controls.I was reading on one of the other posts that REDHAWK crystals worked on the HL transmitter and receiver boards.Not knowing anything about crystals,I ordered some that are FM 27 mhz from tower hobby.I assumed that if they were FM 27 mhz they were the same.Also assumed that (27.195,27.145,)would just be different chanel's in the same freq-range.I'm up-grading a tiger to smoke and sound and put a RedHawk 27.145 into my receiver board,took the crystal out of one of my smoke and sound transmitter's and put in the tx 27.145 in.It turns on the sound,all the turret functions work properly.The problem is the motors to the tracks only partly work.I'm at a loss here as to why.Hope to mabe get an answer from someone who knows about crystals as to why this is taking place. Thanks BIGMIG [:-][:-][:-]