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LDM

This video shows the teardown and reverse engineering of a vintage Radar Tuner TN-131/APR-9. 00:00 - Intro 01:00 - Teardown 02:08 - Input filter 06:08 - FI preamplifier 08:00 - Mixer 10:48 - Servo control feedback potentiometer and reflector voltage setting 13:52 - Motor 15:38 - Frequency setting test 16:34 - Schematic diagram Technical description: It uses a 1N26 mixer diode and a 2K48 reflex klystron for the local oscillator. Frequency setting uses a DC motor and several devices linked to the output shaft: A fixed cam permits to modify the frequency of the reflex klystron. An adjustable cam permits to change the central frequency of the input filter A potentiometer permits to change the reflector voltage of the klystron according to the frequency Another potentiometer is connected to the connector, probably for the servo control of the frequency setting mechanism. A synchro transmitter An internal indication of the frequency using coding wheels Links: Klystron 2K48: http://lampes-et-tubes.info/mwkl/2K48... Recorded 2023/10/31