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Old 05-21-2018, 12:05 PM
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jr_tech jr_tech is offline
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Looks like a simple ham modulation monitor, likely for displaying trapezoid patterns when connected to an AM transmitter. I suspect that it is very similar to this smaller CRM model:

http://www.oscilloscopemuseum.com/os...-crm-sxxx.html

http://www.oscilloscopemuseum.com/up..._schematic.jpg

jr
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