Originally Posted by JamesCam
Anyway, even a decent LC oscillator will have better frequency stability over varying supply voltages than the performance described in the OP's post!
I'm sure it does, though the spec would indicate that stability is not a huge problem, but rather the lack of stability and frequency accuracy will help in identifying more than one ULB in the area. How about an oceanic mid-air! Potentially you may need to identify 4 ULBs.