[Collins] Central Electronics MM-2 Scope with KWM-2A

[Dr. Gerald N. Johnson, electrical engineer]

To be informative, you need to connect that 455 KHz input to the plate
of the second receive mixer, that is before the mechanical filter. You
could connect it after the mechanical filter, but you won't see the dirt
of a dirty signal because the mechanical filter will have cleaned it up.

I don't know about its transmit monitoring capabilities. Would seem to
me that they should be separate, like coupling from the coax line and
going direct to the scope tube deflection plates. That generally takes a
tuned circuit. Inserting a 1 KHz tone into the audio gives you something
of constant amplitude at the output to look at for tuning. And if it was
used with the CE 10 or 20 series exciters, you needed the 1 KHz tone to
do the carrier balance and opposite sideband suppression alignment every
time you changed sidebands at the 9 MHz IF. Those exciters were very
good at making that single tone into an amplitude modulated double
sideband signal.

73, Jerry, K0CQ, Technical Advisor to the CRA
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Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.