C-Quam AM Stereo Transmitter Using Valves
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6 Channel RF Remote Control
This project creates a simple but valuable wireless remote controller. It has as many as 6 channels (a rare feature for remote control devices) and transmits encoded MM53200, UM3750, or UM86409. Of course, you can omit the button and make...
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,...
Grounded Grid Amplifiers
Floating the grid above ground is detrimental for RF performance and arc protection. The connection of the control grid to ground is critical for stability. It is essential to keep the grid connection to ground as wide and short as...
Analog Voltage Camera-Image Tracker
By utilizing a low-cost RS-170 camera and this circuit, a voltage that indicates the position of an object within the camera's field of view is generated. IC2A and IC2B create a valid video gate that keeps IC3 in a reset...
Dave Richards AA7EE
As a follow-up to the previous post, it was discovered that the Sony SRF-59, although inexpensive, offers surprisingly good performance due to its creative receiver architecture. Research was conducted on external antennas to improve reception of weak stations. Among the...
RF-Radio Frequency 6
This circuit is designed to attenuate signal frequency, with a customizable range from 1 to 40 dB. For UHF band usage, it should be enclosed within a shielded frame, and capacitors C1 to C3 should be appropriately selected. The connection...
Adjustable-sensitivity field-strength indicator
The LED illuminates when the RF field exceeds the pre-set field strength level. Germanium diodes are recommended. Additional information: Transistors (NPN) include 2N2222, 2N3393, 2N3904, or equivalent.
The circuit described is a simple RF field strength indicator that utilizes an LED...
field strength meter fsm
A field strength meter circuit is a valuable device for measuring the RF output of any transmitter or for experimenting with different antennas connected to the transmitter. The operation of the field strength meter (FSM) is straightforward; it converts RF...
Beacon-transmitter
This transmitter is suitable for transmitter hunts, remote key finding, or radio telemetry in model rockets. It can be tuned to the two-meter band or other VHF bands by adjusting capacitor C1 and inductor L1. L1 consists of four turns...