- DF9CY Technical Articles and Material
- A collection of technical articles on antennas, radios and other stuff.
[ Hits: 882 | Votes: 1 | Rating: 8 ]
- Ham Radio Projects by Wireless Society of Southern Maine
- Wireless Society of Southern Maine Projects, instructions and photos for many ham radio projects and experiments, including antenna construction and modelling, kit building, station setup, restoration and more
[ Hits: 214 | Votes: 0 | Rating: 0 ]
- Homebrew projects by dl5dbm
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- KW,2-meter,6-meter,antennas,amplifiers,preamps,powersupplys, and more
[ Hits: 27213 | Votes: 154 | Rating: 6.77 ]
- QRO GU-84B TETRODE
- GU-84B Homebrew HF Amplifiers
[ Hits: 8438 | Votes: 21 | Rating: 4.43 ]
- 27Cxx Eprom programmer and KissEprom
- Simple eprom programmer for 27Cxx family , used in TNC and G3ruh modem, eprom tutorial, schematics and KissEprom software for windows by iz7ath
[ Hits: 5609 | Votes: 77 | Rating: 5.26 ]
- 40 meter QRP Transceiver
- This semi-homebrew QRP (low power) CW transceiver is based on the ARK-40 transceiver kit, by S&S Engineering.
With its built-in CW keyer and 5 watts of power, the basic ARK-40 transceiver is an outstanding 40 meter CW performer
[ Hits: 9445 | Votes: 7 | Rating: 6.85 ]
- 40 Segment LED S-Meter
- Provide your radio with a very string signal, then adjust the HIGH LEVEL pot to the threshold of illuminating the last LED (all LEDs on).
[ Hits: 87 | Votes: 0 | Rating: 0 ]
- 7 MHz SSB Transceiver
- Circuit diagram and discription of 7 MHz Ham Radio SSB Transceiver. Transceiver using two MC1496, 4.43 MHz Ladder filter, LM386, LM324 and IRF840 in final.
[ Hits: 19030 | Votes: 43 | Rating: 6.48 ]
- 75 meter AM Transceiver
- Frequency coverage: 3.75 MHz to 4.00 MH transceiver for 75 MHz band
[ Hits: 1185 | Votes: 1 | Rating: 10 ]
- 80 Watt FM stereo broadcast transmitter
- A high quality broadcast transmitter big enough for a medium town
[ Hits: 708 | Votes: 1 | Rating: 10 ]
- A *balanced* balanced antenna tuner
- The published version of this article appeared in the February 1990 issue of QST Magazine
[ Hits: 21611 | Votes: 11 | Rating: 7.28 ]
- A 2.3GHz to 432MHz receiver converter
- Receiver converter that can be plugged to the backside of the Yaesu FT-817 battery powered portable transceiver
[ Hits: 1494 | Votes: 3 | Rating: 4 ]
- A 20 Ampere / 13,8V power supply
- A 20 ampere and more 13,8V power supply for RTX
[ Hits: 21478 | Votes: 43 | Rating: 5.57 ]
- A 6M Transverter
- Build a transverter based on a 6M receive converter. A 32MHz TTL oscillator is used as the local oscillator for both transmitting and receiving. RX/TX switching is handled by three SPDT relays.
[ Hits: 4832 | Votes: 2 | Rating: 10 ]
- A cheap S Meter
- A low-level voltage meter and could even be used for audio purposes.
[ Hits: 2637 | Votes: 4 | Rating: 6.25 ]
- A CW Sidetone Bypass
- A CW sidetone bypass for the NESCAF audio filter, a small and low cost circuit that works great.
[ Hits: 478 | Votes: 0 | Rating: 0 ]
- A D-ATV transmitter project
- Build this simple and cheap 70 MHz Exciter and start to transmit Digital Television by Jean-Francois Fourcadier
[ Hits: 2562 | Votes: 1 | Rating: 8 ]
- A Modern Thermocouple Ammeter
- Thermocouple ammeters are very rare these days, but the job they were perfect for - measuring antenna currents - is still a modern requirement especially in respect to groundplane currents. By David A. Reid PA3HBB G0BZF
[ Hits: 2864 | Votes: 2 | Rating: 6 ]
- A Pb Battery Recharger
- The starting idea was to build a battery charger for Pb battery used in car and moto...
[ Hits: 3220 | Votes: 3 | Rating: 3.67 ]
- A Simple Dual Band SSB Transceiver
- Homebrew a dual-band transceiver with a crisp receiver and a clean SSB signal
[ Hits: 3035 | Votes: 2 | Rating: 7 ]
- A Simple Telegraph Key
- How To Build Code-Practice Apparatus: A Simple Telegraph Key
[ Hits: 9762 | Votes: 12 | Rating: 5.75 ]
- A Simple VFO for 80 and 160 Meters
- This VFO is simple to build and is quite stable.
[ Hits: 1475 | Votes: 1 | Rating: 7 ]
- A Three-Band One-Tube Novice Transmitter
- A homebrew radio transmitter project, based and inspired by the original 30 Watts input on 80 50 and 15 meters band transmitter by W11CP
[ Hits: 333 | Votes: 2 | Rating: 10 ]
- ACWS: Automatic CW Sender by iz7ath
- Simple circuit, with a simple push, transmit a memorized Cw messages
[ Hits: 1450 | Votes: 1 | Rating: 8 ]
- Analog Inputs on a KPC-9612 TNC
- Modify a KPC-9612 to give a total of four analog input for remote monitoring and telemetry.
[ Hits: 678 | Votes: 3 | Rating: 7 ]
- Antenna elevator system for amateur satellites
- Smart homebrew antenna-ELEVATOR system with linear actuator. The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system. This page inform you of the actuator's secrets.
[ Hits: 22257 | Votes: 44 | Rating: 7.66 ]
- AR8000 Serial Link
- A simple and inexpensive way to connect an AR8000 to a portable computer
[ Hits: 1619 | Votes: 2 | Rating: 6.5 ]
- Automatic Band Decoder
- An automatic band decoder made into a nice enclosure with LED indicators for the chosen band
[ Hits: 635 | Votes: 1 | Rating: 10 ]
- Automatic Band Decoders
- Build your own band decoder, for kenwood rigs too
[ Hits: 1188 | Votes: 1 | Rating: 10 ]
- Automatic Band Decoders
- To build a Band Decoder to drive our remote relays, we need to supply the band information from the rig to the decoder
[ Hits: 1201 | Votes: 1 | Rating: 2 ]
- Band decoder
- Automatic and decoder project by sm3wmv
[ Hits: 721 | Votes: 1 | Rating: 1 ]
- Basic RF Oscillator
- A simple RF oscillator by Harry Lythall - SM0VPO
[ Hits: 1470 | Votes: 2 | Rating: 6.5 ]
- Batlabs
- Motorola two way systems technical documents
[ Hits: 1127 | Votes: 3 | Rating: 6 ]
- Bluetooth Audio and Amateur Radio
- Bluetooth headsets are very common with cell phone users. As such, many amateurs may already own a Bluetooth (BT) headset. So why not use it with amateur radio?
[ Hits: 4236 | Votes: 10 | Rating: 6.6 ]
- Build A 100Khz Crystal Calibrator
[ Hits: 2554 | Votes: 7 | Rating: 7.15 ]
- Build a Vox Circuit
- by Mike Martell N1HFX
[ Hits: 5001 | Votes: 22 | Rating: 5.19 ]
- Build yourself an RF Ammeter
- An Easy way to Monitor RF, AC or DC current with one instrument by W5JGV
[ Hits: 3610 | Votes: 5 | Rating: 6 ]
- Change Battery on DVS-2
- The DVS-2 is a CQ unit for the Yaesu Trancievers.
[ Hits: 592 | Votes: 0 | Rating: 0 ]
- CW Filter
- I0QM Gaussian CW Filter page
This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993
[ Hits: 1879 | Votes: 2 | Rating: 8 ]
- CW Key-to-Rig Switch Box
- This is an easy afternoon project to switch multiple cw keys between several rigs. If you've ever wanted to change keys on one rig or use one key on several rigs, this gadget makes it easy. Plug keys into the box inputs, and plug each of the box outputs into a rig. No need to fumble around behind the rigs to move a key from one to another or to swap paddles for a bug.
[ Hits: 41 | Votes: 0 | Rating: 0 ]
- DirectDirt
- The Information Source For Makers, Experimenters, DIY, Home Brewers, Restorers, and Amateur Radio Operators
[ Hits: 496 | Votes: 4 | Rating: 10 ]
- Display/Stabiliser unit
- The Display/Stabiliser unit displays the signal frequency on a Hitachi LCD module.
[ Hits: 814 | Votes: 1 | Rating: 10 ]
- DIY Basic Electronics and Antennas
- DIY Basic Electronic Theory, Basic Antenna Theory with Antennas built from common materials. What does SWR really mean. Baluns from transmission line.
[ Hits: 11358 | Votes: 15 | Rating: 7.85 ]
- DL6JAN's CW keyboard
- A micro processor interface that converts PC keyboard code into Morse code
[ Hits: 2679 | Votes: 6 | Rating: 9.5 ]
- Dual Output 200 MHz RF Generator/Detector
- Dual Output DDS Based RF Generator/Detector with links for the associated QEX NimbleSig III article download by Tom, VA7TA
[ Hits: 1287 | Votes: 1 | Rating: 8 ]
- DVX Project
- Digital Voice Transceiver Project
This Project began to explore the use of the DVSI AMBE 2020 voice compression chip and also the ADF7021 single chip VHF RF Transceiver from Analog Devices.
[ Hits: 1476 | Votes: 1 | Rating: 1 ]
- EI7BA's Amateur Radio Pages
- Antennas and homebrew ancilliary equipment
[ Hits: 2717 | Votes: 17 | Rating: 9.18 ]
- EI9GQ
- Homebrew page with some great homebrew gear shown here.
[ Hits: 24970 | Votes: 33 | Rating: 7.81 ]
- Eprom Eraser
- An Eprom Eraser with UV-Ray for 27Cxx Eprom (and similar, common in TNC) with a timer
[ Hits: 1813 | Votes: 4 | Rating: 7.5 ]
- ESR METER: (Equivalent Serie Resistance of capacitors)
- Esr meter to measure the equivalent serie resistance of capacitors
[ Hits: 5542 | Votes: 28 | Rating: 5.63 ]
- Experimental HF 6-band SSB transceiver
- An SSB radio for the HF bands will be presented. Featuring 12 to 20 Watts of output power (depending on DC supply), full DDS frequency generation, covering 6 major frequency bands (1.8, 3.5, 7, 14, 21 and 28 MHz) within the short wave amateur radio spectrum. The rig also features colored LCD and front panel backlight.
[ Hits: 697 | Votes: 14 | Rating: 9.86 ]
- F5AYE microwaves pages
- Pages on microwaves,homebrew, beacon HB9G 5.7 and 10 Ghz.
[ Hits: 2457 | Votes: 4 | Rating: 6.25 ]
- F5RDH homebrew projects
- some interestig homebrew projects
[ Hits: 14649 | Votes: 35 | Rating: 7.94 ]
- Ferrite information
- Ferrite Toroidal Cores, Magnetic Properties of Ferrite Materials, EMI - RFI Suppression
Design Considerations, Ferrite Beads, Ferrites for RFI Ferrite Cores for RFI Suppression
by CWS ByteMark
[ Hits: 13683 | Votes: 4 | Rating: 5 ]
- Frequency Locked Loop VFO for HF
- A device which joins in a single microprocessor a digital programmable frequency meter and a control logic capable to lock a manually tuned VFO to its actual frequency by IK3OIL
[ Hits: 1842 | Votes: 4 | Rating: 7.75 ]
- G3PTO
- Homebuilt Amateur Radio & CW communications web site
[ Hits: 16995 | Votes: 12 | Rating: 7.6 ]
- Ham Radio Beat Frequency Oscillator
- A simple free running oscillator oscillating at the receiver\'s IF (intermediate frequency) beats with the incoming signals in either CW or SSB and the resultant audio frequency goes to the AF amplifier.
[ Hits: 716 | Votes: 0 | Rating: 0 ]
- Ham Radio Circuits
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- Circuits of SSB Transceiver, AM DSB Transmitter, Antennas, BFO, VFO, 807, FM Mike, Crystal filter and more.
[ Hits: 36097 | Votes: 57 | Rating: 5.36 ]
- HAM Radio DIY Projects by DL8ABH
- Ham Radio DIY projects all around morse
semi-automatic and fully automatic bug keys
construction manuals o semi-and fully automatic Bug keys, portable light weight magnetic loops, making a telegraph set (school project)
and lots of kitchen projects (useful hamradio gear made by easily available material)
[ Hits: 140 | Votes: 0 | Rating: 0 ]
- Ham Radio Homebrewing by IK3OIL
- A collection of projects for Amateur Radio Homebrewing enthusiasts
[ Hits: 23631 | Votes: 21 | Rating: 7.28 ]
- High Potential Tester (high-pot.)
[ Hits: 842 | Votes: 2 | Rating: 7.5 ]
- Hombrewing an HF Transceiver
- This page will describe the construction of a multi band SSB transceiver with all its components Band Pass Filter, Oscillator/Modulator unit, RX/TX Mixer TX Amp I.F. Amplifier AGC VFO Driver amplifier Receive audio amplifier Final amplifier Low pass filter Digital display and VFO stabiliser
[ Hits: 4365 | Votes: 6 | Rating: 8.33 ]
- Home Brew a Condenser Microphone
- An inexpensive condenser microphone with excellent performance can be easily constructed with easily available parts.
[ Hits: 1884 | Votes: 2 | Rating: 5.5 ]
- Home Made 5KV Capacitor
- Building a high voltage (5KV), variable plate capacitor (17 to 220pF)
[ Hits: 1340 | Votes: 7 | Rating: 7.28 ]
- Homebrew Butterfly Capacitor
- Butterfly capacitors are hard to find, expensive but they can be home made by PY1AHD
[ Hits: 4012 | Votes: 12 | Rating: 5.58 ]
- Homebrew Dow-Key
- Homemade an external T/R switch for your vintage RTX by KB8OJH
[ Hits: 351 | Votes: 0 | Rating: 0 ]
- Homebrew resources for wireless enthusiasts
- PDF resources containing information on low cost ssb,am,cw circuits, which are useful for beginners.
[ Hits: 4525 | Votes: 8 | Rating: 7.13 ]
- Homebrew Spectrum Analyzer
- Project for DXers and experimenters alike. An old article publishes by 73 Amateur Radio magazine in PDF format, where all the components required to build your own HF spectrum analyzer may be found in a well-stocked junk box.
[ Hits: 739 | Votes: 0 | Rating: 0 ]
- Homebrew your own inductors
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- Cannot find the inductors you need for an antenna, a tuner or amplifier ? Build your own it is
easy!
[ Hits: 28428 | Votes: 21 | Rating: 6.95 ]
- HSCW transmit interface box
- Versatile transmit interface circuit
[ Hits: 1953 | Votes: 2 | Rating: 8 ]
- Hybrid antenna splitter
- This scheme can be used to combine two antennas
[ Hits: 1049 | Votes: 0 | Rating: 0 ]
- Hybrid Synthesizer for UHF and microwave
- A versatile hybrid synthesizer for UHF and Microwave Projects
[ Hits: 754 | Votes: 0 | Rating: 0 ]
- I1KFH Homebrewing
- Homebrew web site
[ Hits: 5431 | Votes: 3 | Rating: 6.67 ]
- IC8POF'S mods
- IC8POF's How To index, Hamradio mods, Crazy PA Tuner project (transform any manual amplifier in an automatic one).
[ Hits: 935 | Votes: 4 | Rating: 9.25 ]
- IK3OIL Ham radio homebrewing
- A site devoted to Amateur Radio Homebrewing, CW-decoder, CW QRP Transceiver for the 40 & 20 meters band, CMOS reader
[ Hits: 4418 | Votes: 10 | Rating: 4.5 ]
- IK4AUY Sergio
- Advanced QRP Low Cost Mosfets HF Linear Amplifier with schematics, IMD, gain data and more. Six articles about amateur radio.
[ Hits: 3632 | Votes: 27 | Rating: 8.1 ]
- IK8MKK Home-Made equipment
- Two 50 Mhz amplifiers and antenna switch
[ Hits: 2587 | Votes: 2 | Rating: 9.5 ]
- Impedance Bridge
- by Harry Lythall SM0VPO
[ Hits: 4331 | Votes: 11 | Rating: 7.38 ]
- Improved PL Tone encoder
- N1HFX project to improve PL tone encoder providing a more stable frequency
[ Hits: 581 | Votes: 0 | Rating: 0 ]
- IZ7ATH Projects
- Antennas, Keyer, amplifier, transverter, baluns
[ Hits: 23693 | Votes: 26 | Rating: 6.32 ]
- K8CU Technical Topics
- Well documented Amateur Radio HF/VHF antenna projects, high power Russian GS35B RF amplifiers, mobile RFI solutions, related accessories, vintage radios, Six meter equipment, and useful techniques by K8CU are inside.
[ Hits: 3897 | Votes: 11 | Rating: 7.64 ]
- K8TM Articles
- This publications page lists articles on surface mount devices, amateur radio, soldering, shunts, and measuring large direct currents.
[ Hits: 1309 | Votes: 1 | Rating: 1 ]
- Kenwood Pin Connectors
- Microphone, accessories and data packet pin connection schematics for Kenwood Radios
[ Hits: 4086 | Votes: 8 | Rating: 7.5 ]
- KI5YN QLF Filter
- A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.
[ Hits: 351 | Votes: 0 | Rating: 0 ]
- LC METER
- Inductance and Capacitance meter using``Frequency Shifted Oscillator
[ Hits: 11446 | Votes: 21 | Rating: 4.86 ]
- LF Converter
- Home made LF converter, listen to signals below 300 KHz
[ Hits: 432 | Votes: 0 | Rating: 0 ]
- LY3LP laboratory
- QRP DIY and more
[ Hits: 1541 | Votes: 9 | Rating: 7.79 ]
- Make you drill more flexible
- A useful tool to make PCB
[ Hits: 2799 | Votes: 2 | Rating: 3 ]
- N2CQR 20 meter portable DSB transceiver
- Homebrewed transceiver for 20 meter originally born for 17 meters band
[ Hits: 1080 | Votes: 0 | Rating: 0 ]
- N3LS Larry
- Amateur radio links and homebrew projects
[ Hits: 17615 | Votes: 4 | Rating: 1.5 ]
- No tune SSB/CW transceivers
- no tune SSB/CW transceiver for 1296, 2304, 5760 and 10368 MHz
[ Hits: 2769 | Votes: 3 | Rating: 7 ]
- OH7SV Matti Hohtola Ham Projects
- The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO,
50 ohm to 200 ohm HF wide band transformers,
Wilkinson splitter for RX measurements,
Windom baluns 2001/2004,
Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
[ Hits: 20365 | Votes: 36 | Rating: 8.11 ]
- PA3FXO projects
- Contains digimodes, antenna projects, DX info and lots more
[ Hits: 2038 | Votes: 4 | Rating: 9.75 ]
- PC to RTX interface
- Schematics for IC-706, IC-718, IC-756PRO, TS-570, TS-870, and simple universal S.B. interface
All three interfaces presented on this page employ galvanic isolation of the transceiver from PC computer. Audio paths are separated by transformers, optocouplers serve to separate the digital paths (PTT and RTTY keying).
[ Hits: 3775 | Votes: 2 | Rating: 7.5 ]
- PCM Kestrel HF Transceiver
- This article describes an upgrade to the Kestrel transceiver, replacing its LCD display with a 0.91-inch OLED screen for improved sound quality. VFO boards from Denys VK3ZYZ were integrated, particularly a Nano VFO board. The author shares details about the setup and the resulting enhancements, along with images of the modified components. The transceiver is now optimized for various frequencies and operates at a power output of approximately 120 W pep. More information about the boards can be found on the provided website.
[ Hits: 36 | Votes: 0 | Rating: 0 ]
- PG1N's Hambrew Site
- Homebrew-page of PG1N with lots of homebrew links
[ Hits: 1210 | Votes: 76 | Rating: 8.61 ]
- QRP 20m Antenna Tuner Unit
- A QRP antenna tuner for 20 meters band
[ Hits: 10827 | Votes: 6 | Rating: 5.83 ]
- QRP AM(cw) Transmitter for 10 meters
- In this project, you will make a simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator.
[ Hits: 1232 | Votes: 2 | Rating: 10 ]
- Radio-TNC wiring
- Radio-TNC wiring diagrams index
[ Hits: 3526 | Votes: 13 | Rating: 5.22 ]
- Redesigning rotator control meter scale
- Redesigning CDE rotator control meter scale for north-centered operation
[ Hits: 516 | Votes: 0 | Rating: 0 ]
