The formulae for calculating the crystal frequencies are as follows:

UHF
Receive
fc = 8fo - 21.4MHz (403-430MHz)
fc = 8fo + 21.4MHz (440-512MHz)
where fc = desired carrier frequency
fo = first oscillator (crystal) frequency
Transmit
fo = fc / 27
where fo = crystal frequency
fc = desired carrier frequency

VHF
Receive
fc = 3fo + 17.9MHz (136-174MHz)
where fc = desired carrier frequency
fo = first oscillator frequency
Transmit
fo = fc / 9
where fc = desired carrier frequency
fo = crystal frequency