Well, the difference between AF and RF is the same as it's always been.
AF is a pressure wave that consists of alternate compressions and
rarefications in a conductive medium. At present commercial audio frequency
devices range from well below 1 Hz to above 5 mHz.
RF is an electromagnetic wave, consisting of paired electromagnetic and
electromotive (voltage) fields. At present Radio waves from RF radiators
range from around 20 hZ to the lower infrared.
Alternating current in a circuit of some sort is just that. AC. It matters
not if the frequency of alternation is 1 Hz or 100 gHz - it's still an
alternating current. Of course, many devices will not work at too high or
too low a frequency. But that's more or less a moot point so long as the job
gets done.
And the devices in the Orion do an amazingly good job, regardless of their
frequency of operation. Much better than the 85 Khz ARC5 IF's we used to pad
down to 12 to 15 kHz before detection, so we had enough selectivity.
73 Pete Allen AC5E
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