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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 24, 2017 02:54 PM

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

F.E.D. Detects digital RF signals -  The F.E.D.  (Frequency Emissions Detector) will, of course, detect anyone's cell phone, so the detector really responds to just about anybody with more than two pennies to rub together.  Most phones occasionally transmit short bursts to the nearest cell tower, even when the phone isn't in use, so a typical 21st century loiterer will eventually set off the detector.  On the other hand, a deer can stare at it for an hour with no effect.  Let's face it, even most burglars emit digital signals these days.  So, in a sense, the F.  E.  D.  is a human detector.  With that in mind, consider using the output to activate a digital camera or video recorder to capture a record of the prowlers.  A recorded barking dog or, one of my favorites, a recording of police radio traffic will scare off most crooks.  Add some hidden flashing red and blue lights to the police chatter and the culprits will actually run away. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

FM Bug -  This FM bug transmitter circuit will let you spy on people.  The transmitter can be placed in the desired room and the conversation heard from a place far away just using__ Electronics Projects for You

FM radio active antenna -  Today’s wireless communication world revolutionized organizations who are well advanced (& advancing) in design of full fledged compact high gain noise active antenna.  This antenna revolution persuaded us to design an active antenna amplifier __ Contact: KAJA NAJUMUDEEN & CHARLES

FM Stereo Modulator -  This circuitry is used for generating a high quality FM stereo multiplex signal that is suitable for driving mono FM transmitters.  The Rev E2 FM stereo multiplex generator is the most recent design in a series of circuits that have appeared on this site.  This version features improvements to the audio mixer stage, better gain adjustments in the audio filter stage and a rework of the multiplexer stage.  When it is adjusted properly, the Rev E2 design produces an FM stereo signal with excellent fidelity. __ Designed by Forrest Cook

Foxhole radio - true tinkering! -  Building a foxhole radio is rewarding and the basic setup is very simple. It is, however, difficult to adjust, and it may take several attempts to find a proper razor blade for the detector. This is a project that requires patience and much trial and error, but it will pay off once it begins to work. It will help to be versed in the construction and operation of crystal sets before building one.  Brian Carusella

FPGA Based ADS-B Receiver & Decoder -  This page describes the development of the final product Mode-S-Beast, which you can find here. __ Designed by © Günter Köllner, DL4MEA

Frequency Emissions Detector -  The F.E.D.  (Frequency Emissions Detector) will, of course, detect anyone's cell phone, so the detector really responds to just about anybody with more than two pennies to rub together.  Most phones occasionally transmit short bursts to the nearest cell tower, even when the phone isn't in use, so a typical 21st century loiterer will eventually set off the detector.  On the other hand, a deer can stare at it for an hour with no effect.  Let's face it, even most burglars emit digital signals these days.  So, in a sense, the F.  E.  D.  is a human detector.  With that in mind, consider using the output to activate a digital camera or video recorder to capture a record of the prowlers.  A recorded barking dog or, one of my favorites, a recording of police radio traffic will scare off most crooks.  Add some hidden flashing red and blue lights to the police chatter and the culprits will actually run away. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Frequency Meter with 100 MHz RF Desktop channel  -  This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter.  Built and align this is the same manner as the 100 MHz RF desktop channel adapter.  The frequency meter __ Designed by Dick Cappels

Frequency Meter with Minimum Mass Wireless Coupler -  A 0 to 2 MHz ferquency meter with a Minimum Mass Wireless Coupler, based on the ATMega8.  Range to the Minimum Mass Base Unit is 10 to 15 cm.  Since the frequency meter is battery operated, it can be floated from ground, making life in and around the test bench a lot simpler.  No need to connect it to the computer or LCD display __ Designed by Dick Cappels

Frequency meter with wireless Data Channel -  This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter.  Built and align this is the same manner as the 100 MHz RF desktop channel adapter.  The frequency meter __ Designed by Dick Cappels

Galileo2 -  FD-Galileo2 is designed for NASA’s Radio Jove project.  Here is some basic information for your quick review. __ Designed by Nina Gajjar

GBPPR 1 GHz RF Spectrum Analyzer -  Homebrew the most useful tool for a RF experimenter, work in progress. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR 1 kHz to 16.384 MHz Synthesized Signal Generator -  Simple PLL signal generator for the test bench using a common IC. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR 1.2 GHz (23 cm) AM ateur Video Transmitter -  Simple 1.2 GHz FM ATV exciter. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR 2.4 GHz / 10 Mbit Wireless Data Link -  Why buy a wireless network card when you can tear your hair out trying to build one?__ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR 900 MHz Frequency Hopping Spread Spectrum Transverter -  Frequency hopping transverter for amateur radio use. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR 900 MHz High-Speed Packet Radio -  Experimental ideas for a high-speed, interference overcoming wireless data link. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR AutoFox -  Keys a transmitter and plays a pre-recorded message at one minute intervals. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR Divide-by-1000 3.5 GHz Prescaler -  Extend the frequency range on those cheap hamfest frequency counters. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR Frequency Transverters for 2.4 GHz Wireless LAN Devices -  Change the frequency of your amateur radio 2.4 GHz network to overcome interference or line-of-sight issues. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR Packet Radio Weather Radio Alert -  Use the National Weather Service's alert tone to send a packet radio message. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR Portable 28 VDC Power Supply -  Simple and portable 28 Volt power supply. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR Portable Antenna Mast SystE - M -  Portable antenna mast system using PVC conduit. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR POWER 64 kbps Wireless Serial Data ModE - M -  Experimental ideas for a low-speed, interference overcoming wireless data link. __ Amateur Radio circuits from Green Bay Professional Packet Radio

GBPPR VLF Converter -  Homebrew version Marty Kaiser's VLF59-10 5 to 500 kHz VLF converter. __ Green Bay Professional Packet Radio

General Purpose RF Amplifier -  The first article had a 3PDT switch that not only acted as a power switch, but also allowed the user to bypass the amplifier.  This would be very useful for areas with strong stations, to avoid overloading the receiver.  The second article utilized a ferrite bar antenna, which severely compromised sensitivity.  It did, however, include PCB artwork: __ Designed by Bruce Carter

Generic CM108 based USB sound adapter conversion article -  For AllStar (Asterisk) VoIPLocal Copy __ Designed by Author unknownlikely Steve RoDgersWA6ZFT

Generic VHF Power Amplifier -  Once again my collection of projects creation has been interrupted by another necessity.  Patrick and other people have asked me for a circuit of a VHF power amplifier.  These circuits are my "standard" building blocks that can be used to amplify RF power signals, from 50MHz to 170MHz, just a few component changes are required. __ Designed by Harry Lythall-SM0VPO

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

 


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