Double crystal filter for SSB. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Quartz filters
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An SSB signal shaping filter can be assembled with as few as three crystals for the same frequency. Two quartzes are used in the filter, and the third one is used in the reference oscillator. A schematic diagram of a two-crystal filter is shown in fig. one.
Ris.1
The frequency of one of the quartz intended for installation in the filter must be increased by 2 kHz, then the frequency band passed by the filter will be about 2,5 kHz. Methods for increasing the frequency are described in Zverev's article "Crystal filter for SSB" ("Radio", 1966, No. 7).
To check the frequency separation of quartz, an auxiliary generator should be assembled according to the circuit shown in Fig. 2. The frequency difference is determined by connecting an electronic frequency meter to the output of the generator or (in extreme cases) by ear by the pitch of the beats in the telephones. The filter coils L1 and L2 are wound in two wires. The midpoint of the coil is formed by connecting the end of one wound wire to the beginning of another.
Ris.2
In the two-crystal filter assembled by the author, quartz was used at a frequency of 6,333 MHz. The frequency of one quartz was increased by 2 kHz. Coils L1 and L2 were placed on the frame of the IF circuit of the Record TV and contained 13 turns wound with two PELSHO 0,1 wires simultaneously. The filter is installed in the transmitter of the UA3QAV radio station.
According to correspondents (including the collective radio station UA3RDO, owned by the editors of the Radio magazine), the quality of the SSB signal of the UA3QA radio station is good.
Author: S. Gubar, Voronezh; Publication: N. Bolshakov, rf.atnn.ru
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