Help with XTL Controled Radios
 

I have 2 XTL Taxie radios with the freq Tx80 Rx81mc and would like to
change the XTL in the RX only how do I go about it the new frequencie
is 86.? Mountain Rescue N wales uk I am told that I should not have
to re tune the set just change the Xtl
The set is a Tait T199 any help with thanks

Fox