After thinking on it more, 30 KHz bandwidth is too wide to be useful for
a noise bridge detector, as it will not provide enough frequency
resolution for the lower bands. 7-7.3 MHz would only have 10 discrete
measurement points, for example.
If the device were to be used only to measure components, and not
connected to an antenna, lots of circuit simplification is possible in a
bridge generator / detector approach, i.e., a knock off of the classic
GR916 RF bridge with an integrated source and detector. Like Boonton did
with the 250A RX Meter, for example.
However, as soon as you connect the unknown port to an antenna, simple
detectors are out as the null will be submerged in trash unless the
detector receiver has excellent selectivity and that means frequency
stability as well.
Jack
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