2N2/15 CW Transceiver Design Page
No description available.
RF Actuated Keying Monitor
Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...
Tx/Rx Control
This circuitry offers some features that are highly desirable when building a QRP (or ANY) transceiver. It also includes a combination of features that many might not always take the time to include in their projects. Considerable effort has been...
Qrp-cw-transceiver
This is a 3-W, single-circuit board, VFO-controlled CW transceiver for 40 or 30 meters, featuring a direct-conversion receiver with audio filtering, Receiver Incremental Tuning (RIT), and speaker-level audio volume. The transmit frequency is generated by Q1 and its associated components...
Simple Rf Test Oscillator Circuit
A simple oscillator for intermediate frequency (IF) alignment at 455 kHz can be useful in field testing or in scenarios where a standard signal generator is available. The inductor (L1) should resonate at the desired output frequency with the series...
Sensitive RF Voltmeter Probe
Sensitive RF Voltmeter Probe Circuit. This circuit measures RF voltages beyond 200 MHz and up to about 5 V. PARTS LIST: R1 - 4.7 MΩ, R2 - 1 MΩ, R3 - 1 MΩ, R4 - 100 kΩ, R5 - 330...
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...
RF Based Wireless Remote Control Switch
It is often necessary to control electrical appliances remotely, even when there is no direct line of sight between the transmitter and receiver.
In modern electronic applications, remote control systems are increasingly utilized for various purposes, including home automation, industrial control,...
Pal decoder
After several years, the NMS8280 was utilized again for HAM radio purposes. When transmitting a signal, radio amateurs must always identify themselves by providing their callsign, which also applies to video signal transmission. A program was created using the WBASS...
dyi setup and debugging guide
This page discusses the differences between assembled Open USB FXS dongle boards and DIY boards. While the assembled boards are fully tested and quality control approved, DIY boards may encounter various issues during assembly. Fortunately, most of these issues can...