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Cable broadcast amplifiers circuit protection
A cable radio broadcasting studio in rural villages and towns is often equipped with high-power amplifiers that are susceptible to damage. This vulnerability primarily arises from frequent usage without specialized management, leading to situations where the system is often powered...
The AA8V/W8EXI 6CL6 One-Tube Transmitter
The operation of the 6CL6 transmitter is quite sophisticated despite the simple appearance of the circuit. The core of the circuit is the electron-coupled crystal oscillator. This circuit integrates the functions of an oscillator and amplifier into a single tube,...
Visual modulation indicator
The brightness of the indicator lamp changes in accordance with the modulated RF signal. Adjust resistor R2 while the transmitter is on (modulated) until the lamp flashes in sync with the modulation.
Cl = 5 pF, C2 = 100 pF, Dl...
FM voice transmitter for Band 2 VHF
This compact transmitter employs a Hartley oscillator configuration. Typically, the capacitor in the tank circuit connects to the base of the transistor; however, at VHF frequencies, the base-emitter capacitance of the transistor behaves like a short circuit, maintaining its functionality....
RF circuits
A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a few...
the design of the intellectual wireless signal transducer of ARM
The intellectual wireless signal transducer is designed for major transducer applications and typical sensor output signal designs. It is essential to first analyze the outgoing signals from the transducer. Typically, the output of the transducer is a standard electric current...
Radio Frequency Circuits
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valved transmitter for 3.5 MHz
This transmitter project is a highly efficient, rugged, and simple low-power continuous wave (C.W.) unit delivering more than 10W. It is crystal-controlled with stabilized high tension (H.T.) and features a buffer stage between the crystal oscillator and power amplifier stages,...
100W Medium Frequency Transmitter
The 100W4 is a two-tube medium frequency transmitter designed for pre-tuning to three frequencies within the medium frequency band, supporting emissions types A1, A2, and A3. In the A1 configuration, both tubes function as parallel oscillators. For A2 and A3...