Increasing the frequency of quartz. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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The methods of increasing the frequency of resonators with silver-plated quartz plates, published so far in amateur radio literature, do not make it possible to obtain a change in quartz with a frequency of 3-8 MHz by more than 20-30 kHz. The method I use provides a frequency shift of 200-300 kHz while maintaining a sufficiently high activity of quartz.
The silver layer is removed from the quartz plate, and stainless steel plates are used as electrodes (see figure). In this case, the thickness of quartz, which determines its frequency, can be reduced.
For the manufacture of electrodes, steel with a thickness of 0,6-0,8 mm is suitable. The cut plates are carefully leveled, ground and then polished on the surfaces that will adhere to the quartz. After that, with a center punch on an anvil with a recess, four protrusions are knocked out in the corners of the plates and they are ground on a flat bar so that the tops of the protrusions are in the same plane. The gap between metal plates and quartz should be minimal.
Quartz is polished on a flat surface on which fine sandpaper is fixed. After removing the silver coating, the frequency of quartz increases by 40-50 kHz. A further increase in frequency is achieved by reducing the thickness of the quartz plate. During the grinding process, the frequency is periodically controlled, each time the quartz is washed with alcohol and dried.
If it turned out that the received frequency exceeds the required one by 5-10 kHz, the quartz plane being ground is lightly rubbed with a bent silver-plated wire - this will lower the frequency.
Author: V. Katrenko, p. Novoraysk, Kherson region; Publication: N. Bolshakov, rf.atnn.ru
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