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ok offhand I dont know if that is a fundamental or a overtone crystal. It could be either
but its apparent from the recent discussions that unless the series inductor and parallel resistor is used with an overtone crystal, then the BC548 isnt likely to work, as I discovered with my 24MHz crystal.
It works, the problem was with the transistor, I got the correct one instead of the bc....VPP is high abot 7v but vrms is low about 3v (the circuit has no buffer).I wonder why vrms is relatively low compared to VPP , shoud I reduce emmiter resistor?
Anything above ~10MHz and I would usually look at using a RF transistor. Even tho more standard signal transistors may have the appropriate Ft. As you have discovered don't always work without other circuit modifications.
Its all part of the fun of experimenting and learning.
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offhand I dont know if that is a fundamental or a overtone crystal. It could be either