Jeff DePolo wrote:
>In contrast, for proper reject notch performance, there has to be correct
>phasing between cavities. The notches are effectively shorts at the notch
>frequency, and if they are not repeated at 1/2 wavelength intervals between
>cavities, they will tend to not align when cavities are cascaded due to
>transmission line transformer effects (ever try tuning a duplexer and the
>notches act like they're "chasing each other" and you can't get them to fall
>into place).
>
This effect can easily be seen on the Motorola T-1504 BpBr duplexer. If
your cabling isn't right, the pass insertion loss is correct, but the
notches will not align on top of one another and optimum notch depths
aren't achieved. The effects at VHF are not usually as bad because it's
rare that the cable lengths are off at a percentage that shows this
profoundly.
YMMV of course...
Kevin
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