Old Ham Radio Stuff
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Radio Frequency Circuits
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1.5 Volt Tracking Transmitter
A 1.5 Volt tracking transmitter utilizing simple circuits. The current draw for this tracker is 3.7 mA, allowing the 1.5V button cell to have a prolonged lifespan.
The 1.5 Volt tracking transmitter is designed to operate efficiently with a low current...
remote control sckt
The miniature transmitter module, measuring 34 mm x 29 mm x 10 mm, is designed to operate all remote control receiver-switch combinations outlined in this project. A compact 9-volt PP3 battery can be utilized with the transmitter, which is capable...
TRF Radios
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old Russian radio (2x280pF). It has been noted that in areas with strong signals, optimal performance...
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...
WIRELESS MICROPHONE
An operational amplifier integrated circuit (741) amplifies the audio signal from microphone 1 (MIC1), with resistor R12 determining its gain. The amplified audio signal is then directed to the oscillator circuit, which includes transistor Q1 and associated components. D2 functions...
TA8136S Radio Control Transmitter Ic - Toshiba Semiconductor
TB6556FG is a 3-phase full-wave sine-wave PWM brushless motor controller. It features sine-wave PWM control and includes a built-in triangular-wave generator with a carrier cycle defined as fosc/252 (Hz). The device also offers a built-in lead angle control function that...
Transmitter Servicing Course
With the equipment ready for operation, the main line switch (S-831), the emergency switch (S-12), and the main line contactor contacts (K-831B) are all closed. The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary...
Tuned Radio Frequency (TRF) Receiver
Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s.
Superheterodyne receivers represent a pivotal advancement in radio technology, characterized by their ability to convert high-frequency signals into lower intermediate...