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Amplifier Circuits: 
RF (Radio Frequency)

RF Amplifiers:  #'s - C      D - K        L - R       S - Z

Amplifier -- Main Page
 

Last Updated: October 18, 2017 05:04 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Laser Data Links -  Quit shining laser pointers at people and use them for something useful. __ Green Bay Professional Packet Radio

LCD Display with Minimum Mass Wireless Coupler -  Its an adaption of the 2X 16 LCD project, by adding a fettite loop antenna, two resistors, and a capacitor.  Here the display shows the output of the 10 bit scanning voltmeter with Minimum Mass Wireless Coupler.    (ATtiny2313, AT90S2313) __ Designed by Dick Cappels

L-C-R Bridge-G3BIK -  Schematic only __ Designed by va3iul

LF to HF Converter -  This converter allows reception of signals below 500 kHz on a 3.5 4 MHz HF receiver.    It should therefore be useful for those with receivers that do not receive the lower frequencies.  amateur radio construction projects. __ Designed by Peter Parker VK3YE

Linear FM 50Watt with BLY90 -  A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready.  The present circuit can give 50-60W RF force of expense, with control smaller than 15-20W in the region of frequencies of FM, that is to say in the 88-108MHZ.  Transistor that we selected for __ Contact: IQ Technologies

Linux FRS Radio Control -  Easily control a FRS/GMRS radio from a computer. __ Green Bay Professional Packet Radio

Long range ISM band transceiver Design -  his low cost 900 MHz, ISM band transceiver was designed for long range data acquisition / remote monitoring applications.  What makes this Design Idea  lly suited for long range useis the application of a controlled power amplifier and careful narrow band receiver design.  The transceiver __ Designed by Steve Hageman

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 __ Circuit 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 __ Circuit 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

MMR-40 40 meter rig with SSB (voice) & CW (Morse code) operating Modes. -  A 40 meter CW/SSB transceiver using less than $50.00 in parts.  How to build "dead bug" style. __ Designed by Steven Weber, KD1JV

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 S 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

    >>>

RF (Radio Frequency) Amplifiers:  #'s - C      D - K        L - R       S - Z

 


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