|
Low cost RF Module Design & integration - In many cases it's just hard to beat the pricing on many of the pre-built 300 MHz RF modules (as pictured above). These modules are useful in OOK (On Off Keying) applications and data rates to 2400 baud. Specialized coding with checksums, forward error correction, remote control codes or Manchester coding is available for applications that need it. When it comes __ Designed by Steve Hageman
Low cost VHF Synthesizer - This synthesizer was designed to drive a low cost VHF Aircraft Band receiver, but it has applications to any VHF radio in the 75 to 180 MHz band. Low phase noise and reference feed through were also design goals. The design was implemented in just a few day's and was fully tested and characterized. Code was written to allow the synthesizer to be turned on and programmed, thus eliminating extra firmware support from the client. __ Designed by Steve Hageman
Low Frequency Circulator/Isolator Uses No Ferrite or Magnet - The ferrite circulator/isolator is an amazing and important tool for the microwave engineer. Unfortunately, for frequencies below several hundred megahertz, the size of the magnets and ferrite becomes unworkable and the cost skyrockets. With the advent of remarkably fast op-amps, __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Low Frequency Sine Wave Generator - The two circuits below illustrate generating low frequency sine waves by shifting the phase of the signal through an RC network so that oscillation occurs where the total phase shift is360 degrees. __ Designed by Bill Bowden
Low frequency-12 to 40 MHz, self contained synthesizer - This synthesizer was designed to drive a high performance HF (Shortwave Receiver) receiver, but it has applications to any HF radio in the DC to 50 MHz band. Low phase noise and reference feedthrough were also design goals. The design is fully self contained and utilized a low cost shielding arrangement that eliminated the need for costly custom shields. Using a clever AC CMOS
__ Designed by Steve Hageman
Low Power RFID Transponder - This is the Grand Prize winner in the design category of the 1993 RF Design Awards Contest. This entry exhibited both innovative use of RF technology and an elegant implementation of that technology __ Designed by Raymond Page
Low-Cost Laser Data Links - Quit shining laser pointers at people and use them for something useful. __ Green Bay Professional Packet Radio
Low-Cost POCSAG Paging Network How-To - Homebrew your own amateur radio text or tone paging system. __ Amateur Radio circuits from Green Bay Professional Packet Radio
Low-cost RF sniffer finds 2.4-GHz sources - 11/23/06 EDN-Design Ideas Locate interference sources in the ISM band Design by Vladimir Dvorkin, Linear Technology Corp, Milpitas, CA
Low-Cost RF Synthesizer Uses Generic ICs - 24-Jun-10 EDN-Design Ideas You can design a hardware-based frequency synthesizer with one inexepensive IC and a few passive components. Such synthesizer chips are not always available, however, because they are typically single-sourced and are not in stock with parts distributors. The need for a working circuit in a short time and using common parts prompted the creation of the circuit in this Design Idea. The synthesizer covers the US commercial AM(amplitude-modulation) broadcast band. It tunes in 10-kHz steps from 500 to 1800 kHz, but you can scale the frequencies for other applications Design by James B Wood, Inovonics Inc, Felton, CA
Low-Cost Wireless Network How-To - Extremely detailed account of a Part 97 point-to-point 2.4 GHz wireless link. __ Amateur Radio circuits from Green Bay Professional Packet Radio
Metricom Ricochet Radio Experimentation - Experiments using components from old Metricom 900 MHz and 2.4 GHz RF data modems. __ Amateur Radio circuits from Green Bay Professional Packet Radio
MF & HF Receive Antenna Splitter - Circuit only
Miniature MW Transmitter - circuit diagram of simple medium wave transmitter using BF494B. This simple transmitter have a range of 200 meters
Minimum Mass Wireless Data Coupler - Bidirectional RF communications works like very short range (10 to 15 cm) radio but is as easy as IR. __ Designed by Dick Cappels
MK-484 Receiver Chip Evaluation Board for AM & Lowfer bands. - The basic MK484 (Replacement for the ZN414) connected in its minimum configuration as a radio receiver for the A. M. Broadcast band and the upper half of the United States' FCC Part 15 Lowfer (1600-1750 meter) band __ Designed by Dick Cappels
MNA, Low Profile, Low Cost, Fully Integrated Monolithic Microwave Amplifiers - AN-60-016 Application Note __ MiniCircuits.com
Modulation Monitor - Very simple and useful circuit used to monitor on air transmission of your low power amplitude modulated transmitter.
Montreal Doppler 3 DF (direction finder) unit - The Montreal Doppler III is an update of its predecessorthe Montreal Doppler II. It is recommended that you read about them on their respective official pages. Please note that this was NOT an official page of VE2EMMplease read the disclaimer at the bottom of this page. __ Designed by KA7OEI
Morse Code Beacon Keyer - This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter. The keyer can output either a one-shot message such as "CQ DX DE CALLSIGN", or a continuous message. The continuous mode is useful for making beacons for low power (QRP) and slow (QRSS) transmissions __ Designed by G. Forrest Cook
Morse Code Beacon Keyer - This circuit stores a morse code message as bits in an EPROM chip, the message controls a relay that keys a CW (morse code) transmitter. An Arduino processor can also be used in place of this circuit, that eliminates the need to build the circuit and program an EPROM. __ Designed by G. Forrest Cook
Morse Code Tutor - A program (23kb) written in C++. Morse code uses dot and dash for communication. Still it is popularly used for communication is short wave bands. The Archive contains program source code and executable
Morse Keyer - This is not a sophisticated automatic keyer but it is lot QRP to build and to have fun operating it. When the paddle is connected to the DOT terminal, C1 starts to charge. When C1's charge reaches sufficiently high value, it causes the transistor BC157B to conduct and pulls the relay and key the transmitter. __ Designed by K P
Kang
Motorola STF2520A 900 MHz Power Amplifier Modifications - Modifying a surplus Motorola STF2520A cellular-band RF amplifier for 150 watts in the 900 MHz ham band. __ Amateur Radio circuits from Green Bay Professional Packet Radio
Multi-Element Exposed Dipole for 2 Meters - A good exposed Four-Bay Dipole Array construction project.
MW Enhanced Crystal Receiver using 741 IC - Ham RadioV-U)HF AMPLIFIERSchematic __ Designed by Guy Roels ON6MU
MW/SW Radio receiver - Schematic only, no circuit description __ Designed by Guy Roels ON6MU
Novel crystal set requires no antenna, earth - amateur radio construction projects. __ Designed by Peter Parker |
