The PLL FM modem circuit
#PLL
#FM modem
#frequency modulation
#communication
#signal processing
#radio
#demodulation
#modulation
#telecommunication
#circuit design
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optimizing pll performance levels
Designing a Phase-Locked Loop (PLL) synthesizer for modern mobile communication systems requires achieving the right balance among several trade-offs, including spurious levels and frequency switching speed.
The design of a Phase-Locked Loop synthesizer for mobile communication systems is a critical task...
Interpolating Scanner Circuit
This design is for an interpolating scanner, a circuit featuring multiple signal inputs, a control voltage input, and a signal output. The output selectively transitions between inputs, smoothly fading from one to the next as the control voltage increases. A...
Energy-sucking Radio Antennas
Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength, while atoms are more like 1 Angstrom across. Atoms are thousands of times smaller than light waves, yet atoms obviously interact very strongly with light....
PLL pulse generator(74HC4060 TC9122P)
The PLL pulse generator is illustrated in the accompanying chart. The circuit represents a phase-locked loop (PLL) pulse generator. The PLL generates a fractional frequency from a crystal oscillator, producing a 1 kHz stepped frequency signal. Additionally, it outputs a...
Farnsworth Model GT-051 Bakelite Radio (1948)
"Black Beauty" is a nickname for a classy Bakelite radio set. It features a dramatic, asymmetrical design with deep wraparound louvers and a bullet-like profile, exemplifying 1940s Streamline design. The radio is undergoing restoration of its electronics and cabinet. Originally,...
rc1
An Instruction and Reference Book on Radio and Television, Coyne Electrical and Television-Radio School, 1951
This publication serves as a comprehensive instructional and reference guide focused on the principles and practices of radio and television technology as taught by the Coyne...
SAA1057 PLL Synthesized FM Transmitter
The operation of the circuit is managed by a microcontroller from MICROCHIP, specifically the PIC16F84. This microcontroller supports buttons and a 2-line, 16-character LCD display, along with the PLL circuit SAA1057. The voltage-controlled oscillator (VCO) is implemented using transistor Q8,...
bug transmitter with PIC16F870 PLL
This frequency of this transmitter is PLL controlled which makes it very stable. The frequency is programmed in digitally way and can be changed very easy. Frequency range is about 50 to 150 MHz and the output power 100mW. The...
Pll receiver
This simple AM circuit utilizes a 561B. It lacks an inductance/capacitance tuning circuit, as the 365 pF capacitor connected between pins 2 and 3 is responsible for all tuning. A good external antenna and a solid ground connection are required...