Search results
Query: homebrew
Links: 395 | Categories: 5
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A solid state linear based on EB104 Motorola Engineering Bulletin by Helge Granberg. It uses 4 MRF150 FETs in push-pull parallel to acheive 600 Watts from about 6 Watts drive -
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 -
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An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input. -
Home made RF power amplifier for six meter band -
How to homebrew a ENVIS antenna for 80 and 40 meters band -
PE1OPM home made external speaker project -
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Whether we are tuning up homebrew equipment, checking antenna VSWR, adjusting a linear amplifier, or just monitoring output power during a contest, almost all aspects of ham operation can use a power meter. Paul Wade W1GHZ -
Demonstrates the construction and measurement of a single-turn HF receiving loop antenna, built from common materials like electrical conduit and lamp cord. The resource details the physical dimensions, including a 4-meter circumference, and calculates the theoretical inductance at approximately _6.4 uH_. It outlines a method for determining resonant frequencies across the 4-17 MHz range using a _C Jig_ and a _VR-500 receiver_, coupling the loop with a ferrite ring. The article also discusses the impact of receiver coupling on the loop's Q factor, noting a degradation in sharpness due to the transformer's reflected impedance. Analyzes the observed resonant frequency patterns, highlighting an unexpected rise in the loop's effective inductance at higher frequencies, particularly above 13 MHz. While some increase is attributed to distributed capacitance, the rate of rise suggests further investigation. The experimental setup provides practical insights into the challenges of maintaining high Q in simple receiving loops and offers a comparative reference for other homebrew antenna projects, such as those by _VK2TPM_. -
An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french. -
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Homebrew a cobwebb antenna for the HF bands. This page describe a cobwebb multiband antenna resonating on 14 18 21 24 and 28 MHz. The cobweb antenna model can be considered a fan dipole, or better, multiple dipoles fed in parallel. -
This homebrew six-meter linear amplifier started off life as a "junker" Alpha 76PA h.f. amplfier. Power output is 800W -
The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler -
AA7EE QRP DSB transceiver homebrew project -
Alan yates vk2zay's ham radio website, homebrew construction, general electronics, high voltage experiments, amateur rocketry, and general geek stuff -
A remote control box for the SG-237 that allow to turn on and off, check status the SGC tuner remotely by AA5TB -
An homebrew remote antenna switch by vk2zrm -
A homebrew dummy load is usually a combination of several parallel carbon resistors, in order to be able a final resistance of 50 Ohms. -
A project for a home made 5 element yagi-uda antenna for 2 meters, covering 144-148 MHz band by N1BMX -
A DIY project details the construction of a modular QRP CW transceiver specifically designed for the **20-meter band**. The design is segmented into three distinct modules—VFO, Receiver, and Transmitter—allowing for phased construction and independent testing. The VFO circuit, capable of operating as a conversion VFO or a free oscillator, provides a frequency span of approximately _70 KHz_ (2.433 to 2.510 MHz) with a 4V pp output level, utilizing a Colpitts FET oscillator and buffer. The receiver employs a classic superheterodyne architecture with MOSFETs in the front end and mixer for improved overload immunity, incorporating a 4-crystal ladder filter with a 600 Hz bandpass and an LM386 audio power amplifier delivering about 1W into an 8-ohm load. The transmitter section uses frequency conversion with an NE602 mixer to achieve 14 MHz operation, featuring a power broadband stage capable of 4-5W output into a dummy load, and includes a double Pi filter for signal cleanliness. The resource provides detailed component lists, tuning instructions for each module, and 1:1 scale PCB layouts for single-sided boards. -
Building a cavity resonator for 144 MHz -
Homebrew G5RV a simple multiband antenna. This article shows detailed pictures of a G5RV home made antenna, including antenna size and dimensions by 9M2ZAK -
The resource details the historical development of the Morgain antenna, tracing its origins to Virginia in the 1960s and its subsequent global adoption among radio amateurs. It describes the Morgain as a dual-band wire antenna known for its reduced footprint and modest gain characteristics. The content includes discussions on various homebrew projects and design variations available online, providing context for its continued relevance in amateur radio. The article presents a historical overview rather than specific construction plans, focusing on the antenna's evolution and general design principles. It highlights the antenna's enduring appeal due to its performance attributes and compact size, making it suitable for various operating environments. -
Nowdays lots of people are putting up antennas to either beam in different directions at the same time or just to stack them and get a lower angle of radiation. Use this stackmatch to match you array. -
Ham homebrew, software, and ham info -
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Collection of different techniques to homebrew PVC yagi antennas, including elements assembling, baluns and chokes, radiator box tips and tricks by dk7zb -
Shortened vertical antenna for 40 meters band an homebrew project -
A 40/80 meters dipole made with two loading coils based on a project by IK1ZOY -
Small and inexpensive homebrew HF radio 5W Output, CW SSB AM FM, DSP, Speech Processor, Sprectrum Scope, Watefall Display. mcHF is a small, home-brewed amateur radio project. Firmware is released as open source. -
Homebrewing a mic boom headset for the Yaesu FT 897 and 857 transceivers -
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ST2NH blog - first ham blog from africa fatures QRP,Homebrew,news,links -
Offer a wide range of homebrewing projects mainly for VHF UHF operations. From vhf antennas to preamplifiers, chargers and power supplies -
If your doing any home brewing gear for ham radio its a great idea to have a dummy load. This will to your radio be the perfect antenna...it will never radiate but your radio sees a perfect 50 Ohm impedance. -
7N3WVM homebrew project of a 3 W output CW transceiver on 7 MHz band -
Homebrew a compact yagi antenna for 14 Mhz suitable for those with small plots based on a design by AB4GX -
This article explain how to homebrew and use an HF antenna analyzer by simply adapting a Windows PC, micro-controller and a DDS evaluation board by K6BEZ -
Building a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. -
There is not a personal design on this page, just I've transfered useful notes from PHILIPS RF Bipolar Transistors - Data HandBook about BLY89C VHF Power transistor, which is very popular among Amateur Radio homebrewers -
Centre fed half wave dipoles make great, simple and effective antennas for the HF bands. Sometimes however, the centre feed is not ideal. This great project will improve the overall antenna performance. -
A magnetic longwire unun with a T130-2 Iron Powder core by M0UKD -
VHF UHF diplexer by G8MNY -
A homebrew Magmount for 2m antenna -
Collection of telegraph keys homebrew antenna projects links to radio software -
Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM -
A project for a SDR receiver by Juan Domenech Fernandez