@mjtech01.bsky.social

@mjtech01.bsky.social

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Closeup of section of the circuit board containing the BK4819 chip, 26MHz crystal and various surface-mounted ceramic capacitors. Picture is taken through a binocular microscope and thus slightly misty and distorted. Shows detail of the capacitor added in series with one crystal load capacitor.
Fragment of the example schematic diagram from the BK4819 radio chip data sheet.
Tektronix 7904A oscilloscope operating with a 7L12 spectrum analyzer module set to approximately 440MHz mid-span, 20kHz per division. A peak is visible on the screen corresponding to the radio's transmission.
Inside of PMR446 radio showing circuit board with various components and below it the back of a speaker.
Picture of two toy PMR446 radios, one green and blue and the other pink. Both set to channel 8.