I've got the VHF version of the SCR-500, but the manual shows the crystal information for all the bands. I'm showing the same formula that you have below for the UHF 406-512 receiver. My manual is dated Edition 1, 7/87.
It specifies that the mode is 3rd overtone. Did you get a 3rd overtone crystal? 73, Joe, K1ike w4clj wrote: > Just received the crystal for a new operating frequency but the formula > Xtal=(f-21.4)/6 shown in the manual is wrong and so is the schematic. >
