Michael Black wrote:

Look again, the Galaxy does not use a Wadley loop.

It uses a phase locked loop synthesizer to generate the first local oscillator
signal every 500KHz (or is it 1MHz in the Galaxy?).

A Wadley loop, while providing the same overall effect, is a result of the
right mixing, adding and subtracting, in the signal chain.

What confuses people is that the design of the synthesizer in the Galaxy
uses a similar bit to the Wadley, putting the reference frequency through a
multiplier that puts out signals at every harmonic of that reference. IN
the Wadley, that signal is used to generate the needed beat signals, in
the Galaxy that signal is compared to the local oscillator in a phase detector
to lock the local oscillator.

Visually change the multiplier to a programmable divider chain, and in the
Galaxy you'd have a more recognizeable synthesizer. It just came before
programmable dividers were cost effective, just as the case with the
National HRO-500, so they went with the muliplier, though there is a
tradeoff in use and performance compared to a synthesizer with a programmable
divider.

Change the mulitplier in the Wadley to a divider, and the thing won't work at
all.

Michael

The Panasonic RF-3100 used a 'semi-synthesizer' design which generated
the MHZ ranges and combined these with conventional analog tuning within
each MHZ range.


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