Encyclopedia of radio electronics and electrical engineering / radio reception
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It is possible to increase the sensitivity and selectivity of the transistor receiver by applying the circuit shown in Fig. 1.a. This cascade increases the quality factor of the contour coil of the ferrite antenna. Coils L1 and L2 are wound on a cable paper frame located on top of the loop coil L3 of a ferrite antenna (Fig. 1, b), and each contain 10 turns of PEL wire 0,6-0,8. The wiring diagram of the cascade is shown in fig. 1, in.
As T1, transistors P401 - P403, P420-P423 can be used.
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