5 Watt 80 Meter QRP CW Transceiver -  A great deal of interest has been generated by my previous design articles, so I decided to go to work on a full blown transceiver design.  After several months of work, the ROSE-80 transceiver was born.  This design boasts the following features __ Designed by Radio Amateur Society of Norwich

5 Watt FM Amplifier -  This design is a 2 stage amplifier that has about 17db of gain, suitable for an input of 50 to 100 MW.  its basically a Veronica 5 watt vco transmitter, without the vco.  The transistors are a 2N4427 and a MRF237.  Output power is 2.5 to 5 watts, depending on input drive and dc voltage.  .__ 

50 MHz to 10 MHz receive converter -  This is a six metre version of the two metre converter on my web page.  I used 3SK45 MOSFETs for Q1 and Q2.   __ Designed by EI9GQ homebrew radio

50 MHz to 146 MHz Converter -  amateur radio construction projects.   __ Designed by Peter Parker

500 kHz to 3 GHz LED Field-Strength Meter -  Schematic only __ Designed by va3iul

500mW HF Linear Amplifier -  his project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to build a 500mW linear amplifer covering the entire HF band with excelent spectral purity and no neutralising at all.  Ugly-bug construction was used but I dare say that the good results are partly to do with the method of construction. __ Designed by Harry Lythall-SM0VPO

50MHz Converter -  50 MHz to 10 MHz receive converter __ Designed by EI9GQ homebrew radio

50MHz converter project based on a NE602/SA602/NE612 -  This is a very sensitive 50Mc converter allowing you to receive the entire "Magic Band" (50Mc  52Mc) on your general coverage receiver (28Mc  30Mc).  it receives all types of modulated transmissions.  it all depends on the receiver used.  I'vetested this project on a allmode Yaesu FRG-100 receiver.  Within certain limits you can change the output frequency to suit your needs.  The converter is very stable, low nois, sensitive and low on power consumption and can be compared to many commercial 50Mc receivers.   __ Designed by Guy Roels ON6MU

50MHz power Amplifier -  Schematic only, no circuit description __ Designed by JH0WJF

50O Load & Power Meter -  A 50Ω dummy load is a simple but crucial piece of test equipment.  Not to perform tests on its own, but to provide a good testing environment.  A common test is output power of a transmitter, or a stage within a transmitter.  At QRP power levels of 5 watts or less, it becomes very practical to combine a dummy load and power meter into a terminating power meter __ Designed by Bob Cromwell

555 Time-Difference-Of-Arrival RDF UNIT -  This T.D.O. A.  RDF set is built on a Radio-Shack experimenters board.  it uses a single 555 timer wired to produce a square wave output at about 500 Hz.1N4007 power ectifier diodes were used in place of PIN diodes to switch between two dipole antennas at a 500 Hz rate.  if you substitute another lower voltage power rectifier,  __ Designed by Joe Leggio WB2HOL

56K RF Modem -  This is a prototype of the WA4DSY 56KB RF modem.  it is intended for use on amateur packet radio networks.  The modem generates RF in the 28 to 30 mhz range and requires and linear transverter to convert the signal to a UHF or microwave ham band.  The digital interface is synchronous serial.  The modem supplies TX and RX clocks.  For more details see the various links below.   __ Designed by Dale Heatherington's Ham Radio, Electronics and Robotics Web Site

5Mhz Broad Band  Optical Fiber Receiver -  This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers.  it has a bandwidth from 1KHz to over 5MHz.  it is great for experimenting with various modulated. . . Circuit by David A. Johnson P.E.-June, 2000

5W QRP with KT907 -  Schematic only, no circuit description __ Designed by © 2001 - YO5OFH, Csaba Gajdos

6 Meter Converter   From the article "Junk-Box Converters for 6 and 2 Meters", by Rod Kreuter, WA3ENK, QST, January 1997, Page 33.   . . .  Web Author: David White, WN5Y

6 Transistor Super Regen Receiver -  Solid State Superregenerative Receiver.    This is the only solid state super regen design with more than 20uV sensitivity on FM that I know of.   __ Contact blehack @ yahoo dot com

6 way broadband RF distribution 20dB coupler -  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

6 x 6 Loop Antenna -  This new loop antenna is his best design yet and I am proud to be the first to present his work.  it uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz, 5000KHz __ Designed by Graham Maynard

60W Linear Amplifier -  The 60 Watt linear amplifier is simple all solid state circuit using power MOSFET iRF840.  The iRF series of power transistors are available in various voltage and power ratings.  A single iRF840 can handle maximum power output of 125 watts.  Since these transistors are used in inverters and smps they are easily available for around Rs: 20/- __ Designed by Mohamed Agha

6M receive converter -  This is a six metre version of the two metre converter on my web page.  I used 3SK45 MOSFETs for Q1 and Q2.   __ Designed by EI9GQ homebrew radio

70-120MHz FM Receiver -  This simple one chip FM receiver / TV tuner will allow you to receive frequencies from 70 up to 120MHz.  With this small receiver it is possible to pickup TV stations, entire 88, 108MHz FM band, aircraft conversation and many other private transmissions__ 

70-W S-Band Amplifier for MMDS & Wireless Data/Internet Applications 12/11/00  -  App Note 1038__ California Eastern Laboratories

72 part contest rig -  This 30 meter rig with superhet receiver and xtal controlled transmitter won "Honorable mention" in the 2010 FDiM ACRi design contest.  Uses a LM386 audio amp as a combination product detector / audio amp. __ Designed by Steven "Melt Solder" Weber  KD1JV

7MHz SSB Transceiver -  Circuit diagram and brief description of 7MHz SSB Transceiver for Hams.  The circuit is designed around two numbers of MC1496.  it can push around 80 Watts with iRF840 in  final.  You can down load HTML version or  printer friendly word document.   __ Designed by Yujin Boby

8 Channel ADC for Radio-SkyPipe -  This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing

8 Channel RF Remote Control -  This is an 8 Channel RF Remote Transmitter and Receiver that will allow to remotely control various electronic projects.  RF Remote Control provides 2 latched and 6 momentary outputs that could be used to control your favorite devices such as amplifier, robotic devices, RC cars, computer, home appliances, lamps and many other cool gadgets.  __ 

80 Meter CW ARDF Receiver -  This page contains updates, feedback and circuit modifications relating to the foxfinder-80 ARDF receiver article that appeared in the November, 2000 issue of 73's amateur radio today.  The design data posted at this site reflects the version used at the 2002 championships in Georgia__ 

80 meter direct conversion receiver -  Schematic only __ Designed by Peter Parker VK3YE

80 Meter, 5 Watt CW Transceiver -  A great deal of interest has been generated by my previous design articles, so I decided to go to work on a full blown transceiver design.  After several months of work, the ROSE-80 transceiver was born.  This transceiver is similar to other designs but contains some unique differences.  This design boasts the following features __ Designed by Radio Amateur Society of Norwich

80 METRE RECEIVER -  This 80M receiver design includes the necessary switching to allow the SSB filter and first i.F.  amplifier to be used for transmitting.  The receiver stages from R.F.  input to speaker output will be described in detail below. __ Designed by EI9GQ homebrew radio

80 Watt UHF PA, Modified NMT transmitter -  This is not a homemade design !  only modified..
All the stuff in the other small rooms, osc.  pll.  modulation.  drivers and so on has been removed
The PA gives 80 Watt out after the filter, at 28Volt powersupply and 30Watt input drive __ Designed by Thomas Scherrer OZ2CPU

800Watt HF 4tubes Amplifier -  This project was done in 1988, the hole in the front plate is the band selector switch for the output coil
 __ Designed by Thomas Scherrer OZ2CPU

807 & 1625 Valves -  data on vacuum tubes 807 and 1625 used in ham radio transmitters.  Describes various pin voltages and different operation modes.  __ 

80m band direct conversion receiver -  The first differential amplifier inside the NE592 is used in this application (unlike it's normal function) as a symmetrical mixer.  For mixing purposes the oscillator signal is fed to both emitter terminals (pin 2 and 7) in parallel.  Received signals from the CW segment preferably reach the NE592 differential input due to a pre-selection of a 3560 kHz tuned input filter.   __ Designed by DL2YEO

80m Direct Conversion Receiver -  Schematic + Notes __ Designed by Peter Parker, VK1PK

80m hexfet power Amplifier -  Schematic only, no circuit description __ Designed by W7ZOI

80m SSB & CW QRP superhet transceiver -  The 80m SSB & CW transceiver an already proven concept used in ATLAS amateur transistorised transceivers from 70's.  The "two-mixer + 1 XTAL filter" design uses the 1st mixer as front-end mixer on receive as well as SSB modulator on transmit.  The second mixer is used as SSB product detector on receive and as a heterodyne mixer on transmit.  VFO and BFO are cross-switched between both mixers with a PIN diode matrix.  Between 1st mixer's output and 2nd mixer's input a crystal filter is placed, followed by an AGC PIN attenuator __ Designed by Aleksander Stare

80Watt HF one transistor Amplifier -  This PA is a homemade copy of the famous Zetagi B150, I got a box and PL sockets from an old dead B-150
The PCB was so tired and burned so I had to construct it using no PCB at all..
At 4 Watt input I have 60 Watt out, 6 W in gives 80 W out. __ Designed by Thomas Scherrer OZ2CPU

81 Meter CW ARDF Receiver -  This page contains updates, feedback and circuit modifications relating to the foxfinder-80 ARDF receiver article that appeared in the November, 2000 issue of 73's amateur radio today.  The design data posted at this site reflects the version used at the 2002 championships in Georgia__ 

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