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I have tried most of the methods discussed with old
receivers like tapping the IF out to another RX but there is no future in
chasing old technology. At the time old equipment was adequate for the job,
stability and selectivity was not so important and could be overcome by a
competent CW operator with a good pair of symetrical ears.
I find that a modern state of the art RX out
performs anything that has gone before, for both stability and selectivity and
more convenient to use. Some modern receiver not specifically designed for LF ie
137 khz do lack sensitivity but this can be over come by a well designed preamp
and good bandpass filter ahead of the RX.
The stability especially those on very slow QRS
needs the modern approach.
The pegelmesser device(level meter) especially
those with high stability locked oscillators are excellent as LF
receivers.
Apart from nostalgia and antique interest ditch the
boat anchor and hear and see what is going on with todays
technology.
de G3KEV
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