[Elecraft] Re: MFJ259

[Jack Smith]

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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