Universal detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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Readers are offered a regenerative receiver (see figure) based on a well-known two-transistor emitter-coupled generator [1]. In order for the device to perform the functions of receiving, detecting and amplifying radio station signals, an WA3 antenna is connected to its tunable circuit and C1, a variable resistor R4 is introduced to control the generation mode, and a load resistor R2 is installed to highlight the low-frequency signal. Amplifies the signal cascade low-noise field effect transistor VT3.
In the under-excited mode, the device can be used as a regenerative detector for receiving AM signals from radio broadcasting stations operating in the LW, MW and HF bands; In the generation mode, which is set by the resistor K4, which regulates the feedback by changing the generator supply voltage, the device turns into a direct conversion receiver that receives CW and SSB signals in beat mode. In the capture mode, fluctuations by the input signal (when setting up the L1C3 circuit on a VHF station) - the receiver will receive FM signals. In this case, it is more expedient to apply the signal from the antenna to the emitters of transistors VT1, VT2.
The greatest effect from the use of this device is achieved when using it as an IF path and an FM receiver detector. For this purpose, 3-4 turns of wire should be wound on the IF circuit of the VHF receiver mixer, one end of which should be connected to the common wire, and the other end through a 75 Ohm resistor to the input of the device (excluding WA1, C1, L1C3). With this inclusion of the function of the oscillatory circuit of the generator, L1C3 performs the IF circuit of the receiver mixer, connected to the generator through the newly wound coupling coil. The proposed detection method gives a lot of scope for building a wide variety of detecting devices by using a wide variety of AF amplifiers, changing the methods of switching on the oscillatory circuit, and reducing the supply voltage down to 1,5 V.
Literature
- Universal LC generator. - Radio, 1979, No. 5, p. 58
Author: V. Nosenko, Yasny, Orenburg region; Publication: N. Bolshakov, rf.atnn.ru
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