this page shows the schematics for the station radio
wireless set C13

this page is a continuation from the previous page of the C13 manual

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click here to download a complete tarball of the entire
high resolution scan of the manual including schematics

individual images are links to their high resolution images


schematics table of contents
table of contents
film strip dial
film strip cam


the sub chassis unfolded amazing stuff
it really does fold out like this, the real image is amazing. It is truly the roll royce of radios
                 
ledex rotary relay
composite relay diagram
summary of relays
RF power amp description


master oscillator electronic reactance control




the C13 external PSU
calibration systemreceiver block diagram
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transmitter block diagram




schematic transmitter sectionschematic if amp fm limiter section
main if amp, bfo, audio, PM discriminatorrf front end, first mixer, xtal bank oscillator vfo
external PSU moduleThe psu was the only dissapointing part of the system. It needed 24V at a gazillion amps. The vibratory supply gave poor regulation. I should have fed mine with 24V AC and replaced the vibrator with diodes but I didnt have a schematic and reverse engineering it was impossible due to its ultra compact construction.  Instead I biult my own DC regulated supply which allowed the C13 to truly shine.

My reverse engineering was accomplished by monitoring the power harness voltages under various operational conditions and designing something that behaved the same ! The older C42/45 used a solid state inverter.
External PSU

valve filament hi current wiring
the "intercomm" amplifier chassisvalve heater chain
film sproket mechanism
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film sprocket mechanism detailed


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using tables to improve layout, low res thumbs to improve display speed
Tue May  6 17:42:57 EST 2008, fix some errors Tue Jan  5 18:29:07 EST 2010