Ch3-57 - testing at 167 MHz, sensitivity comparison with the Chinese PLJ-8LED-H frequency counter.
I'm testing the use of the Ch3-57 frequency counter at non-standard frequencies and its sensitivity from the "A" input, compared to the Chinese PLJ-8LED-H frequency counter.
The Ch3-57 electronic frequency counter is relatively little featured in YouTube videos, but it's nonetheless a rather interesting device from the Soviet era. The Ch3-57 is assembled using TTL 133, 136, 100, and 155 series components, meaning it doesn't contain any assemblies, integrated circuits, or microcontrollers. It uses only low-integration TTL and ESL microcircuits. It doesn't have any outstanding parameters by modern standards, but for its time, it was a fairly good device.
One of the features of this frequency counter is the ability to measure ultra-low pulse repetition rates, down to 10,000 seconds. Furthermore, the frequency counter circuit contains a reserved capability for measuring frequencies up to 500 MHz, making it an interesting subject for research. Unlike its counterpart, the CH3-54, it has a much smaller footprint while offering virtually the same basic capabilities. The CH3-57 frequency counter also has a very stable reference voltage generator, the same as the CH3-54, which is thermostatted. The quartz crystal is housed in a Dewar flask, which significantly increases its stability.
Soviet frequency counter CH3-57, cymometer with Nixie tube indicator. Made in the USSR in 1985. Compare with PLJ-8LED-H.