An Audio-Noise-Based Voting -  As hand-held transceivers (H-Ts) become smaller, and low power, battery conserving operation becomes more popular, the disparity between the transmitting range of a typical 100 watt repeater compared to the repeater accessing range of a typical 1 watt or less H-T becomes more and more apparent.  How often have you found it difficult (or impossible) to access a repeater with a low power H-T even though you can hear the repeater at full quieting? This can happen even if the repeater is equipped with a high sensitivity, state-of-the-art receiver.   __ Designed by Mark Kolber  WB2WHC

Antenna & RF preamp for weather satellites -  All the details for a simple turnstile/reflector antenna plus an RF preamp that mounts up on the mast to really drag on those satellite images.__ SiliconChip

Antenna 1/4 wave for 940 to 980MHz easy homemade  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

Antenna height measurement made easy  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

Antenna Projects -  Specifications and designs are subject to change without notice.
Use on your own risk. __ Designed by Mijo Kovacevic, S51KQ

Antenna Switch for Dicke Switching Receivers -  This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing

Antenna Tuning Unit -  A simple passive (no power required) circuit to match an antenna to a radio receiver.  This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band.   __ Designed by Andy Collison

Antennas for Low Power Applications -  There seems to be little information on compact antenna design for the low power wireless field.  Good antenna design is required to realize good range performance.  A good antenna requires it to be the right
type for the application.  it also must be matched and tuned to the transmitter and receiver.  To get the best results, a designer should have an idea about how the antenna works, and what the important design
considerations are.  This paper should help to achieve effective antenna design.   __ Designed by Kent Smith

Antennas for the space-restricted -  amateur radio construction projects.   __ Designed by Peter Parker

Antennas-Includes longwire, loading coil, active ferrite antenna, active short antenna, vertical. -  Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners.  if you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising clarity.  Short-wave receivers are always coping with weak signals and they must have a good antenna to perform adequately.  Scanners can pick up local police and two-way radio with the little telescoping antenna provided but with good antennas a scanner becomes an amazing ear on the world nearby.  No pre-amp, filter or other receiver refinement offers anywhere near the level of performance improvement t that a well-designed antenna offers.  The results can be quite satisfying, leaving no doubt that the project was well worth the effort __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

AP2000 VHF reconstructed to a DUAL VCO Police Scanner with PIC & LCD -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

Arduino-Based FM Receiver -  This project is an FM receiver circuit radio based on Philips TEA5767 digital radio-receiver module.  The radio receiver uses i2C interface with Arduino UNO development board.  The TEA5767 module offers such...__ Electronics Projects for You

Asynchronous Divides Frequency by 1.5 -  10/10/96 EDN Design Ideas:  in some designes, you need to provide a number of phase-related clocks to various components.  in most cases, you generate the needed clocks by dividing a master clock by a power of two (synchronous division).  However, sometimes, it is desireable to divide a frequency by an odd or even fractional divisor.  in these cases, no synchronous method exists without generating a higher frequency master clock.  Figure 1 shows the block diagram of an asynchronous clock divider that provide as division by a factor of 1.5. Design by Rolf Fielder, Ferrari Electronic GmbH, Teltow, Germany

ATL3 Loop Antenna -  All ATL-3 loop windings are centre tapped and balanced w.  r.  t.  their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel.  Magnetic noise fields, e.  g.  televisions and the electric meter box, or __ Designed by Graham Maynard

ATV Repeater Controllers -  Specifications and designs are subject to change without notice.
Use on your own risk. __ Designed by Mijo Kovacevic, S51KQ

Audible S-Meter -  hand-drawns schematic only __ Designed by byon Garrabrant N6BG

Audio/Video Sender -  This circuit provides you with wireless audio and visual transmission to a TV.  The TV acts as a receiver, eliminating the need to buy a separate monitor.  You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Circuit design __ Contact info @ wzmicro.com

Automatic Gain Control AGC -  This project is a digital Automatic Gain Control (AGC) system using a PIC 16F876 MCU.  The ability to set the gain level in a circuit and have it control itself is a very useful function.  This circuit is a building block of another project I am working on.  A 30W power amp for either the PCS, iDEN or CDMA frequency bands.  I will settle on one of those frequencies sometime soon.   __ Designed by steevn.geo @ yahoo.com

Automatic Repeater -  This circuit will be of interest toradio amateur and anyone possessing two radios, (one of which must be able to transmit i.  e.  a transceiver).  it is a self powered (audio derived) repeater circuit for receiving a signal and re-transmitting it viaor radio.   __ Designed by Miroslav Adzic

Automatic Tuner-Tranceiver Interface ATTI for IntelliTune MFJ-993 (TM) by OZ2BKK (updated 4'th of october 2005) -  PIC 16F876 based circuit controlling the Yaesu FT-817, FY-857 and FT-897 from the intelliTune MFJ-993 tuner (made in May 2005)  __ Designed by Bjarke Korsgaard

Automicro RX3302 receiver Module photo -  Schematic Only __ Designed by Peter Jakab, Electrical Engineer, Engineer of Informatics

Aviation Band Receiver -  Figure 1 shows a schematic diagram of the Aviation Receiver--a super heterodyne AM (Amplitude Modulated) unit built around four IC 's: an NE602 double balanced mixer (U1) , an MC1350 linear iF amplifier (U2) , an LM324 quad op-amp (U3) , and an LM386 audio amplifier (U4).  in operation, an antenna that plugs into J1 picks up the AM signal.  That signal is then coupled through C1 to a three-section, tuned-filter network consisting of L1-L5 and C2-C6 __ Designed by Tony van Roon  VA3AVR

AVR Based Serial Port IR Receiver -  This is a simple iR receiver circuit which plugs into a serial port of a computer.  Okay, there are many other circuits of this kind, and most of them are even simpler, but this circuit has two major advantages: (1) it uses an Atmel AVR RiSC microcontroller (an AT90S2313) instead of the usual PIC  microcontroller and (2) it uses a MAX232 for the generation of valid RS232 levels.   __ Designed by Klaus Stock

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