PULSE DEMODULATION
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MK414 SW Receiver
The original data sheet for the MK414 indicates that the maximum working frequency is approximately 4 MHz. SW transmissions are sufficiently strong that this receiver can effectively operate with signals up to about 6 or 7 MHz. A 10k resistor...
Receiver/Scanner Preamp Circuit
The low-cost Mini-Circuits MAR-X series of chips provides a significant advantage for RF builders, featuring inherent 50-ohm input and output impedances essential for RF systems. An MAR-1-based receiver/scanner preamplifier is illustrated. Capacitors Ci and C2 are chip capacitors, with values...
Corsair and Commando TXs
This document provides information about the Corsair and Commando Transmitters designed by Dave Martin of WNKR. It outlines the construction of each transmitter and includes examples created by others. The circuit diagram presented illustrates the initial two stages of a...
Dummy Transmission Circuits for Subcutaneous Transmitter
The project involves the development of a miniature transmitter suitable for implantation in a rat's body, capable of transmitting 416-bit data samples at a rate of 400 samples per second. It is designed to have a detection range of three...
Transmit Time Limiter
This circuit prevents transmissions that are too long, which can cause timeouts in repeaters and/or occupy a communication channel for an excessive duration. During transmission, the PTT (push-to-talk) line from the microphone is grounded, resulting in one input of the...
Telegraph Transmitter in the Pilot Radios Radio Design magazine 1930s
The TPTG transmitter has been transformed into a modern TNT model. This transmitter can utilize the existing K-111 power pack for both the transmitter and receiver, eliminating the need for a separate power supply unit. Building this compact transmitter allows...
Jammer circuit
The frequency jammer operates by generating interfering RF noise centered around a 2.45 GHz carrier frequency. As the power of this noise increases, the signal-to-noise ratio of the wireless communication channel decreases, leading to a higher bit error rate until...
transmitter circuit diagram
Clearly indicate on the circuit diagram each type and size of the components. There is a need for assistance in designing a low power FM transmitter circuit, specifically using the BA1404 FM transmitter with a center frequency of 79W and...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...