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Need a variable power supply that is short circuit protected and over voltage protected; Here is a good one that can be built cheap by VE3IVJ

Wholesale distributor of CB radios, parts, antennas, microphones, power supplies, crystals, echo boards, expanders, meters and CB accessories.

1.2-30V 1.5A variable regulated power supply

This simple hack turns your Raspberry Pi into a powerful FM transmitter

Preamp & Power Amp By Alkberto, I0XGR

Power supply from 3 to 30 V with an L200 IC by dl5dbm

Collection of TS-50 mods, LCD display dark, TS50<-->AT50 communication, TS-50 Power Mod for QRP, TX Coverage mod TS-50, CAT control for TS-50S

SWIFT WX Version 2.0 combines a powerful GIS mapping engine with real-time weather maps and storm tracking data making it the most comprehensive storm tracking application available.

Circuits, pictures and data about toroids, tubes and home made power amplifiers

A Comprehensive roundup of the most popular QRP transceiver kits on the market in recent years in PDF format

A new SDR-receiver from the italian SDR developers community. Low-cost, DDS-less Software Defined Radio full coverage receiver for all HF bands, used with powerful software on the PC for multi-mode operation

Astron corporation power supplies and accesories

A great source for hard to find HI END & power tubes & sockets, various capacitors, vacuum relays, various keys and paddles.

This transceiver was conceived as a power-efficient, small, lighweight unit to be carried in the backpack, along with antenna and battery.

The Raspberry Pi Repeater Controller Project goal is to develop a low cost, low power, but feature rich duplex repeater controller suitable for setting up a temporary or emergency repeater systems with radios that can be run on portable power

This project is an interface box for the Yaesu FT-817 that includes a band output port, a computer serial interface, and a remote interface for the FL-7000 (and Quadra?) solid state power amplifiers

This simple 30m QRSS beacon is built entirely out of junkbox parts, the only component purchased specifically for this project was the 10,140kHz crystal. Hans Summers' 30m QRSS beacon project emphasizes simplicity and low cost, built almost entirely from reused parts. Key components include a 10,140kHz crystal, a 2N3904 transistor from a broken DVD player, and an ordinary LED used for frequency shift. The oscillator is stabilized in a polystyrene box, with power amplification driven by recycled copper PCB. Output power peaks at 360mW, and a custom 50-ohm dummy load manages heat. Though aesthetically unconventional, the beacon works effectively, fulfilling the project's low cost aim.

An RF power supply for 144 MHz schematics and instructions

RF power meter, dummy load, project

High Voltage Supply for GS 35B Amplifier

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.

Low power VHF RF amplifier with VMP1 Mosfet by IZ1BTS IK1XPD

That just about sums up many peoples attitude towards test equipment. Multimeter, SWR/Power Meter, Dip Oscillator, RF Signal Generator, Cathode Ray Oscilloscope

In this article the schematic is of AA5TB QRP power meter and dummy (50 Ohm) load combination

Power supplies, electrical testers, battery analyzers, cable tester, rf generators, spectrum analyzers, Digital/Analog Oscilloscopes, Multimeters , attenuators, frequency counter

Schematic for Data, power, CAT, Key and Mic connection interface cable

Building a Dummy Load and Measuring Power Accurately

A Low -Power, Distributed Capacitance Twisted Loop , indoor portable HF antenna by Monty Northrup, N5ESE

The sun can power your Ham station and a whole lot more. Using solar power panel with a 12 volt battery can permit you to operate autonomously even for several hours without interruption.

This project was published in the April 2004 issue of the Australian magazine Amateur Radio, and has been designed using parts which are very readily available.

Ferrite Toroids. Iron Powder Toroids. Ferrite Beads. Split Cores. Cable clamp-ons. Balun Cores. W2FMI Baluns and Ununs. Inductive components for EMI Suppression and RFI Suppresion, power supplies, HAM radio.

BIRD RF power measuring, new and used, HENRY RF power amplifiers (used HF amps), TOHTSU coaxial relays, SAMLEX power supplies, RFI chokes reduce interference, Parts parts, tubes, Used amplifiers, radios, antennas and accessories, Los Angeles, CA.

1 watt amplifier for 10 ghz made from surplus stuff

This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

The Icom IC-7300 is a popular HF transceiver among amateur radio operators, known for its advanced features and performance. This modification guide focuses on enabling extended transmission capabilities, specifically for MARS and CAP frequencies. The instructions are based on the work of PA2DB and include detailed steps for removing specific diodes to unlock additional frequency ranges. Before proceeding with the modification, users are advised to take necessary precautions, such as ensuring the radio is powered off and using ESD protection. The guide emphasizes the importance of using appropriate soldering techniques and tools to avoid damaging sensitive components. A video demonstration is also provided to assist users visually in performing the mod. While this modification can enhance the functionality of the IC-7300, it is crucial to note that it may void the warranty and should be undertaken at the operator's own risk. The guide serves as a valuable resource for those looking to expand their operating capabilities with this versatile transceiver.

Computes the Standing Wave Ratio, given the power readings on a line.

HF Forward Power & Return Loss (SWR) Meter

VU3NSH article on high current universal supply for rigs

New and Pre-Owned Agilent, Avcom, Fluke, Hewlett Packard, Instek, Leader, LeCroy, Tektronix,and more ..Oscilloscopes, Spectrum Analyzers, Network Analyzers, Power Supplies, Video Test Equipment, Generators, Meters and more

A VHF power amplifier made with two cheap RF transistors, 2N3924 as driver and a BFS22A for final stage, giving an unexpected output power of 7-8 watts maximum

VHF UHF Amateur radio antenna and antenna parts, accessories for homebrewers, antenna kits, tubes, antenna masts, antenna tripores, insulators, power amplifier mosfet, power splitters by I0JXX

Electronic components dealer, semiconductors, switches, leds, motors, solar energy, ferrites, toroids, capacitors, batteries, jacks and plugs, microphones, meters, power supplies, speakers, transformers, wire and more

Powerful antenna modeling tool using NEC 2 computing engine. Nec2 specifically provide users, either those experienced with the Nec2 processes, or for those who are neophytes but want to model their own antennas. Nec2Go uses a simplified process for defining the antenna structure and then providing view of the structure, plots (2D and 3D) and other significant data that is pertinent to the design. This simplified process uses an edit file with equations for all definitions.

A simple 40 meter CW transmitter, it sports full break-in operation and 250 mW of output power.

A MRF141G 3-175MHz Broadband Power Amplifier DL4MEA 02/1998

by Ken Neubeck WB2AMU

Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.

Home made RF power amplifier for six meter band

Hilberling GmbH based in Rendsburg Germany manufacturer of HF VHF Transceivers, rf power amplifiers, power combines, RF generators, power supplies, Antenna Diplexers and Triplexers

Digital filter for Macintosh computers with a PowerPC processor