Tester for selection of quartz resonators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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When selecting quartz resonators (for example, for a quartz filter), the Pekka Vahakangas tester will be useful. It consists of two crystal oscillators (IC1b, IC1c), mixer IC1a, IC1d, buffer IC2a, envelope detector (IC2b and diode detector), and shaping buffer IC2c.
(click to enlarge)
The frequency of the pulses at the output of the latter is equal to the difference between the frequencies of the main resonance of the quartz resonators X1 and X2.
Author: Pekk Vahakangas; Publication: N. Bolshakov, rf.atnn.ru
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