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Small & practical DIY inverted U antenna. This design worked very well during the 2017 CQWW 160M SSB contest. -
Free programming software for the Wouxun KG-UVD1P, KG-UV2D, and similar radios. -
Technical and modification information on Astron Power Supplies compiled from a number of different sources by Mike Morris WA6ILQ -
This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C. -
An home made SWR meter for 2.4 GHz. A DIY SWR meter that allow precise measurements and calibration of any WiFi antenna. This is test equipment everyone who build wifi antennas should have in their shack. Article is in french and include some videos. -
An easily transportable vertical antenna for 20 meters collapsible to 4 feet -
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On this page is the design for Dual Band 2M / 70cm antenna with 3.2mm elements. The antenna has a 50 ohm designed driver. This Yagi has a unique element called a Open Sleeve -
Converting A PC Power supply for Amateur Equipment -
A 4 yagi beam VHF antenna made with PVC easy to carry in a backpack for portable operations -
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Robert Norgards KL7FM's, notes on upgrading the Heathkit SB-200 -
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List of north america beacons transmitting on vhf and uhf bands compiled by WZ1V -
Building a functioning transceiver for less than $10 by AL7FS -
Description of the 80m antenna used at CN2WW in the ARRL-DX CW 2007 -
A super-fast PSK mode for RTTY Contesting, 100 wpm character transmission speed for contest exchanges and macro transmission versus RTTY at 60 wpm -
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G3WZT design for a bi-polar 600W Linear Power Amplifier for the 6M band. -
A light and portable magnetic loop antenna with improved bandwidth and performance by HB9MTN -
A magnetic loop antenna using a 28\" bicycle rim for six meter band -
Announce your callsign at least once every ten minutes. HamTime runs in the corner of the screen and gives you an audible alarm when that announcement is due. -
The Icom IC-746 is quite a popular HF/VHF multimode transceiver which has one shortcoming in its standard configuration when used to operate modes requiring good medium-term frequency stability. -
Overvoltage protection, Voltage stabilization, Grounding in wiring, Ground wire resistance -
Technical details of the yaesu FT 9000 -
picture and dimensions of a coax loop antenna centered at 51.490 MHz -
conversion of low band VHF Philips FM-92E to 6 metres -
Near Vertical Incidence Skywave (NVIS) and the 40 meter Novice Sub-band. -
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An end-fed halfwave antenna for 20 meters band with balun pictures and description by PD7MAA -
Codec2, an open-source speech codec, targets low bit rate voice communication, specifically designed for digital radio applications operating within constrained bandwidths. The project focuses on achieving intelligible speech quality at data rates around 2400 bits per second, a critical parameter for efficient spectrum utilization in amateur radio. Its development addresses the need for robust voice transmission over channels where higher bit rate codecs would be impractical or inefficient. The resource details the technical specifications and implementation aspects of Codec2, including its underlying algorithms and performance characteristics. It provides insights into how the codec processes speech to achieve its low bit rate, outlining the various coding schemes and their impact on voice fidelity and error resilience. The information presented allows radio amateurs and developers to understand the codec's operational principles and its suitability for integration into custom digital communication systems. Applications for Codec2 extend to digital voice modes on HF and VHF bands, enabling more users to share limited spectrum resources. The project's open-source nature facilitates community contributions and widespread adoption, fostering innovation in digital amateur radio. It represents a significant effort to provide a freely available, high-performance speech coding solution for the amateur radio community. -
Demonstrates the design principles and performance characteristics of **corner reflector antennas**, emphasizing their high gain and directional properties. It covers critical design factors such as the corner angle and the spacing between the radiating dipole and the reflector vertex. The resource explains how reducing the corner angle increases gain but lowers feed impedance, making matching more challenging. Practical angles of 90 degrees or 60 degrees are discussed, with 90 degrees offering easier impedance matching despite slightly lower gain. Details key design considerations, including reflector side length exceeding two wavelengths and reflector width greater than one wavelength for a half-wave radiator. It specifies reflector construction using wire netting, sheet metal, or parallel metal spines spaced less than 0.1 wavelength. The article provides a table with general dimensions for UHF and VHF bands, noting typical impedance values of 50 to 75 ohms and expected SWR of 1.7:1 on the lower band edge. Adjustable radiator-to-vertex spacing is highlighted as crucial for final tuning. -
K2 logging system by WB2QAP, logs ARCI sponsored contests and others with same point system -
My Version of Wes Hayward W7ZOI / Terry White K7TAU Spectrum Analyzer -
Manufacturer of small portable telegraph keys, keyer paddles, and electronic keyer products. -
RADIOING eEngineer RFI EMI information -
Information and digital audio samples of various modem modulation types -
The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler -
Calculate online, ERP in dB and dBi given PWR Frequency Coax lenght and type and antenna type -
Address and links of many broadcasting stations -
A magnetic loop antenna for 7 Mhz by ZL1BJQ -
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Alan yates vk2zay's ham radio website, homebrew construction, general electronics, high voltage experiments, amateur rocketry, and general geek stuff -
DIY kits a 70W SSB linear Power Amplifier for YAESU FT-817 KX3 running HF 80m-10m bands -
A remote control box for the SG-237 that allow to turn on and off, check status the SGC tuner remotely by AA5TB -
A PC headset to Rig adapter. Include a circuit diagram and a full part list for the project -
A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cables. Many hams connect the center conductor of the coaxial cable to one side of the dipole, and the shield to the other. Wrong! -
An RF power Amplifier for HF bands with 3 GI-7B tubes by CT1FMS