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688 links - and 2 categories

BalUn for Delta-loop & Quad-loop antennas - This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.
[ Hits: 286 | Votes: 1 | Rating: 9 ]

To transform ot not to transform - Feed Lines - Transmission lines have many uses other than simply transferring RF power from one point to another. Impedance matching, baluns and filters are probable the most common of these.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

A QRP Transmatch ATU - A home made Antenna Tuner made with a simple inductor and a few spare parts. Despite the title, the author succesfully tested this ATU with higher power inputs.
[ Hits: 204 | Votes: 0 | Rating: 0 ]

Kuhne Electronic - High quality microwaves components for professional and radioamateurs. Power Amplifiers, Low Noise Amplifiers, Es hail 2 Converter Transverter, Signal Sources, Passive Components and Accessoires
[ Hits: 106 | Votes: 0 | Rating: 0 ]

FT8 and splatter and the ugliness of ALC - A guide to properly use FT8 ALC and power when transmitting in FT8 Mode. Incorrect usage of power and audio from your computer may cause unreadable signals and transmit harmonics that can didturb other signals.
[ Hits: 391 | Votes: 1 | Rating: 1 ]

PD Powerbank for SOTA Radios - This post describes how the newish Power Delivery (PD) mode mobile powerbanks can be used to power a SOTA transceiver as well as keeping your other hiking devices charged.
[ Hits: 144 | Votes: 0 | Rating: 0 ]

Midway Electronics - Midway Electronics supplies the area with electronic components, wire, cables, amateur radio transceivers, QRP kits, CB transceivers, GMRS radios, Shortwave radios, power supplies, antennas, coax, connector and ham radio accessories
[ Hits: 216 | Votes: 2 | Rating: 3 ]

DesignSpark - RS Online - DesignSpark PCB is a free PCB design tool, by rs online, designed to help the user to convert their design into PCB faster with unique design options. DesignSpark is a powerful software engine that enables you to capture schematics and design PCB boards and layouts.
[ Hits: 71 | Votes: 0 | Rating: 0 ]

The DxDozer - Ultimate HAM Radio LogBook for Windows for both beginners and experienced Dxers. It features several functions like complete logbook with powerfull search capabilities, FT8 and LoTW integrations, DX cluster. Cat Interface to control your radio, licence is based on yearly subscription.
[ Hits: 197 | Votes: 2 | Rating: 9.5 ]

OpenRepeater for Raspberry Pi - OpenRepeater is a low cost, low power, but feature rich duplex repeater controller suitable for setting up a temporary / emergency repeater systems with radios that can be run on portable power. Download the latest OpenRepeater software for your Raspberry Pi 2/3/3B+/4. This image contains everything you need to get up and running quickly.
[ Hits: 383 | Votes: 0 | Rating: 0 ]

Amateur radio 3D models - 3D printer models for Ham Radio accessories and parts like Crank knobs, antenna insulators, powerpole clips, adapters, yagi antenna clips, antenna and radio mounts.
[ Hits: 297 | Votes: 2 | Rating: 5 ]

600W LDMOS Power Amplifier - A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.
[ Hits: 884 | Votes: 1 | Rating: 10 ]

432 MHz 100W RF Power Amplifier - This article describes the construction of a 100-Watt, 70 cm amateur band linear power amplifier. It is the result of a protracted period of experimentation during which I investigated a number of final amplifier stages from obsolete UHF FM 2-way radios.
[ Hits: 239 | Votes: 1 | Rating: 9 ]
Homebrew 1 Watt 2.4 GHz Power Amplifier - This will show you how to add a RF power amplifier to your Proxim Symphony for under $50. The cost is reduced by using the existing components on the Symphony, such as the PIN diode switch, and just inserting a higher power final amplifier. Increase the RF output power of your wireless network card to 1 Watt.
[ Hits: 159 | Votes: 4 | Rating: 6.5 ]

Online dBm to watts conversion - dBm to watts conversion calculator and explaination on how to convert dBm to watts, including dBm to watts conversion table
[ Hits: 131 | Votes: 4 | Rating: 4.5 ]
mW to dBm Calculator - Online calculator that will convert power entered in milliwatts to dBm. Includes a quick mW to dBm conversion table
[ Hits: 82 | Votes: 0 | Rating: 0 ]

Basics of Anderson PowerPole Connectors - How to build and secure Anderson Power Pole Connectors properly
[ Hits: 146 | Votes: 1 | Rating: 2 ]

Repair or Replace Electrolytic Capacitors - For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. Electrolytic power supply caps likely constitute the single worst liability in old audio, radio and test equipment. Rap about Electrolytics, Reforming, Chassis-Mount Replacements, Under-Chassis Installation, Rebuilding Capacitors
[ Hits: 121 | Votes: 1 | Rating: 6 ]

Gimme Five - QRP SSB Transceiver - Gimme Five reloaded, a compact 5 band QRP SSB transceiver in SMD technology. This unit covers 5 bands within the amateur radio spectrum (3.5, 7, 14, 21 and 28 MHz). Receiver is a single conversion unit with an interfrequency of 9 MHz. Transmitter uses 5 stages and has got a power level of 10 watts PEP output.
[ Hits: 285 | Votes: 1 | Rating: 10 ]

QRP 20m Transmitter - The 1 watt 20 meter QRP transmitter with VXO. This is a nice QRP transmitter that can be used in combination of one of the simple receivers.
[ Hits: 151 | Votes: 0 | Rating: 0 ]