Not having built or tuned them, I'm ignorant on the following issues. 
1. Cavities are roughly tuned by their physical dimensions, and then tweaked by rods, plates, etc., eh?
2. Obviously size/shape can be optimized, but are cavities for the 2 meter band essentially the same size, and the tuning is sufficient to optimize them at the desired frequency?
3. How awful a compromise would it be to use available cavities from a 2 meter system at railroad frequencies (160-161 MHz) ?
Thanks,
Don








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