Also you may want to keep in mind this hi/lo thing only applies to Futaba Rx's due to the way they center tune for either the upper or lower half of the band. The other majors all now center tune to the center of the band and no longer have this problem. In their case the Rx can be changed from on end to the other end of the respective band with no problems.

Another point to remember this does not apply to Tx's. All Tx's unless they are synthesized or can accept a module with another Frequency must be retuned to change crystals.

John