SSB generator unit
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HAM RADIO SW RECEIVER
A simple radio receiver circuit is illustrated. This receiver is designed to capture signals from amateur radio stations operating in the shortwave (SW) bands of 10, 15, 20, 40, and 80 meters. The direct-conversion receiver comprises a set of input...
Simple-ham-band-receiver
This circuit is designed for operation in the 80m band. It utilizes a 365-pF variable capacitor, specifically intended for the broadcast band, which should be equipped with a vernier drive featuring a six-to-one tuning ratio. This configuration enhances the tuning...
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...
RF Decibel Meter Circuit
A DIY RF decibel (or power) meter is an essential instrument in any radio workshop. However, accurate, wideband models can be quite costly.
A DIY RF decibel meter serves as a valuable tool for measuring the power levels of radio frequency...
One Receiver
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design utilizing...
transmitter circuits 4
If the audio input is a microphone, it is expected to precede an amplifier to achieve an output power of approximately 8W. The amateur seeking to enhance a small transmitter, which is likely already constructed, can utilize this circuit, which...
rf remote control encoder and decoder
This document explains two RF 433kHz remote control chips specifically designed for remote control applications. The IC TWS-434, along with its encoder chip HT-12E from Holtek, forms a high-quality transmitter circuit, while the chip RWS-434, paired with the decoder IC...
RF Signal Generator circuit
This signal generator is designed for the realignment of radio receivers. The unit is inexpensive and relatively simple but adequately serves its intended purpose. However, the output is not a pure sine wave, which may make it unsuitable for more...
REGENERATIVE_SHORTWAVE_RECEIVER
The receiver consists of multiple subassemblies, including an active antenna, an amplifier featuring regeneration control and band-switching circuitry, an AM detector, a power amplifier, and an output device such as an internal speaker, external speaker, or headphones. Additionally, it is...