design and construction of radio
#radio
#RF
#transmitter
#receiver
#antenna
#frequency modulation
#amplifier
#tuner
#broadcast
#communication
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RF field strength meter circuit
A sensitive and reliable RF field strength meter is an invaluable instrument in amateur radio and in the radio-controlled model area. A field strength meter is.
A radio frequency (RF) field strength meter is a specialized device used to measure the...
Emitter negative feedback differential amplifier gain control circuit
A controllable gain amplifier functions as an automatic gain control circuit within the execution unit. The primary methods for controlling the amplifier's gain involve two approaches: one is by adjusting certain parameters of the amplifier itself, such as emitter current,...
ATV JR TRANSMITTER 440 MHz
This low-power video transmitter is suitable for remote control applications, surveillance, or amateur radio. It employs seven transistors within a crystal oscillator multiplier RF power amplifier chain, along with a high-level video modulator. A supply voltage ranging from 9 to...
RF Circuitry Links
The 7th overtone of 18 MHz (17m) is 144 MHz (2m) directly within the CW region. Icarus is a high-altitude balloon (HAB) project funded by advertising revenue, which has successfully launched numerous balloons that captured impressive photographs. Robert Harrison is...
Precision QRP Transmitter
This compact transmitter is suitable for less demanding Doppler propagation measurements. It is designed for operation on the 80m band but can be easily adapted for the 40m or 20m bands. The output power is approximately 500mW of unmodulated carrier,...
Amplifier Timer Circuit Schematic
This circuit deactivates an amplifier or any connected device when a low-level audio signal is absent at its input for at least 15 minutes. Activating switch P1 powers the device, enabling operation of any appliance connected to SK1. The input...
Simple Short-Wave Transmitter
This low-cost short-wave transmitter is tunable from 10 to 15 MHz using a ½J gang condenser VC1, which sets the carrier frequency in conjunction with inductor L1. Frequency trimming is achieved with VC2. The carrier signal is amplified by transistor...
Armstrong Oscillator
The Armstrong oscillator is utilized to generate a sine-wave output with a constant amplitude and fairly stable frequency within the RF range. It is commonly employed as a local oscillator in receivers, as a source in signal generators, and as...
Rf Preamplifiers Circuit
In this basic MAR-x-based circuit, both the input and output consist of a single DC-blocking capacitor (C1 for the input and C2 for the output, respectively). The DC power supply network, which includes L1 and R1, is connected to the...