New schemes of super-regenerative radio receivers for VHF experiments. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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The N1TEV article "New Super-Regenerative Circuit for Amateur VHF and UHF Experimentation" describes several circuits for super-regenerative VHF radio receivers. The author describes the history of creation and the principle of operation of such receivers. Their "classical" schemes on lamps and transistors are given.
For example, Figures 1...3 show diagrams of super-regenerators at 144 MHz, made according to traditional circuitry.
Ris.1
Ris.2
Ris.3
Further, the author considers the operation of superregenerators for narrow-band FM and proposes three experimental designs of receivers made by him. The basic circuit of the 144 MHz super-regenerator proposed by him is shown in Fig. 4.
Ris.4
1. Super regenerative receiver for 38-54MHz band.
The circuit contains a high-frequency pre-amplifier on a field-effect transistor Q1, a super-regenerative detector on transistor Q2, and an audio frequency amplifier on a U1 chip of the LM386N type. Transistor Q4 has a voltage regulator for powering high-frequency stages (by adjusting the voltage, it also sets the super-regeneration mode).
Ris.5
Figure 6 shows the design of the coil L2. It contains 7 turns of wire with a diameter of 0.8 mm on a mandrel with a diameter of 6,5 mm. Coil winding length - 25 mm. the withdrawal is made from the middle. The coil is located at a distance of about 18 mm from the "ground". Chokes L1 and L3 - standard 33 µg.
Ris.6
The design of the receiver at 38-54 MHz.
2. Super regenerative receiver for 118-136 MHz (Air-band)
This design is similar to the previous one, but here a noise reduction circuit is added, made on the U2 chip and the Q3 transistor.
Ris.7
In this design, the L2 coil contains 5 turns and is similar in design to the one described above.
3. Super regenerative receiver for 88-180MHz band.
The scheme is similar to the above. The range is divided into two sections 88-150 MHz and 120-180 MHz and is switched by the S1 toggle switch. The bandwidth of the receiver in the range of 15-250 kHz is regulated by resistors R6 (Rqw) and R5B. With R6=0, the bandwidth is maximum.
Ris.8
The design of the coil L2 is shown in Fig. 9. It contains 3,5 turns of wire with a diameter of 0.8 mm on a mandrel with a diameter of 6,5 mm. Coil winding length - 25 mm. the withdrawal is made from the middle. The coil is located at a distance of about 18 mm from the "ground". Chokes L1 and L3 - standard 15 μg.
Ris.9
Structurally, the receivers are surface-mounted on a breadboard with a metallized surface on one side. The connections between the components are made with minimally short jumpers (probably, mounting on "patch" according to Zhutyaev's method is most acceptable here).
The design of the receiver at 88-180 MHz.
Author: Charles Kitchin, N1TEV, translation and publication: N. Bolshakov, rf.atnn.ru
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