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A javascript online calculator of bearing and distances by G4VWL -
Luksa industries design and manufacture mechanically operated aluminum telescoping masts and telescoping tripods to support communications and military antennas -
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20 Watt Power Amp for Softrock or for QRP transceivers by M0RZF -
Since 1998, Radio Age has offered for sale antique radios from the Golden Age of radio -
The purpose of this page is to examine the performance of a typical Beverage when all variables except length are held constant -
Buy old manuals, military radios, kits, receivers online shop -
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Access to club info, meeting info, regional weather radar, linux links and various amateur links. -
The Official Web Site of the Long Island Mobile Amatuer Radio Club. The 4th largest ham radio club in the USA! We have 3 hamfests a year and repeaters on 2M, 70 CM, 220 Mhz and 1.2 Gig. -
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RF and Microwave Power Amplifier and Transmitter Technologies, amplifierlinearity, efficiency and available RF power devices. -
Useful pages of longwave operations, includes a lot of reference files, beacons list, sounds and pictures -
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A Contestpedition Cable for TR-Log and the IC-706 by K6XX -
DIY a Wi-FI Helical Antenna for better performances, a project by PA0HOO i Dutch end English -
Promote and announce amateur radio special event stations. -
The club was founded in 1981 by 17 Charlotte-area hams interested in DXing & contests -
The Collins 516F-2 is a heavy-duty power supply for the KWM-2/2A transceivers and the 32S-1,2,3 series of Collins transmitters. -
Windows shareware, automatic NCDXF beacon monitor for Radio Amateurs, SWL'ers and HF communication engineers. by Alex VE3NEA. It continuously monitors 18 NCDXF beacons on five bands, automatically detects the presence of the beacon signals, even in QRM and noise. -
For Italian operators who like TS2000 -
The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions. -
Live audio feed from Denver Colorado Police -
FISTS is a well established and recognized CW organization in the world of amateur radio. -
The Quadlong antenna for the six meter band. This antenna feature a total gain of 6,4 dBd, F/B 21 dB and is also available in 70MHz version. Includes detailed pictures and plot diagrams. -
Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window. Run on Linux. -
World of radio, continent of media, mundo radial broadcast schedule -
A controller for the miniVNA using an Arduino UNO and touch screen color graphic LCD display -
The utility "NEC-2 for MMANA" is intended for calculation of antenna models made and optimized in program MMANA and for construction and simulation of antenna models using input language NEC-2 and based on MMANA models. -
Simple circuit, with a simple push, transmit a memorized Cw messages -
Mods.dk - modification for IC 2720H -
Radau-Funktechnik - ham radio dealer from Lorrach, Germany -
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Table of Frequency Allocations as published by the Federal Register and codified in the Code of Federal Regulations remains the legal source material. -
How the tube converts DC to RF Power -
A DIY project of a WiFi 10 elements Yagi antenna -
A solutiom for the Ameritron AL-811(H) RF power amplifier, burnt panel meter lights. A common failure with the Ameritron AL-811 and similar amplifiers is that the panel meter lights burn out prematurely. These bulbs are usually integrated into the actual panel meter. The solution for this is to provide the meter backlighting with LEDs. -
The HB9DHG Contest Calendar aggregates contest information, offering direct links to official rules and past results for various amateur radio competitions. It features a curated list of events, with a focus on HF and digital mode contests, ensuring that operators can quickly access relevant details for upcoming and historical events. The calendar is regularly updated to reflect the latest contest schedules and rule changes. Each entry typically includes the contest name, dates, and a direct link to the sponsoring organization's page, such as ARRL or DARC, where full regulations and scoring information are available. This resource streamlines the process of finding contest specifics, which is crucial for effective pre-contest planning and post-contest analysis. Validation and checking of contest information are emphasized, providing a reliable source for operators planning their contest activity throughout the year. The calendar supports both CW and SSB modes, alongside various digital modes. -
Building a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. -
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Adjusting audio output of your soundcard to obtain a perfect PSK signal from your transmission. A project to help you tuning your PSK31 emission. -
Accurately determining an antenna's feedpoint impedance is crucial for optimal performance, especially when experimenting with new designs or making adjustments. While SWR meters provide basic information, a full complex impedance measurement reveals the resistive and reactive components, which are essential for proper matching. Modern antenna analyzers, like the _Palstar ZM30_ or MFJ259B, simplify this task, but measurements taken through a transmission line require careful interpretation due to impedance transformation. This resource details a calibration method to precisely account for the effects of the feedline. It explains how a transmission line can significantly alter the measured impedance, illustrating this phenomenon with a Smith Chart example where an 80m antenna's [22 + j6] Ohms feedpoint impedance transforms to [82 + j45] Ohms after a 10m line. The guide demonstrates using a transmission line calculator applet, such as the one by W9CF, to reverse this transformation. It outlines the process of calibrating a specific length of RG174 coax, showing how an initial 26ft estimate was refined to **25.85ft** to accurately predict a known 22 Ohm load, significantly improving accuracy over uncalibrated results. -
This circuit consists of microphone amplifier and a high pass filter. Suitable to improve signal readability. -
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Using MFSK mode, 98 Kb PDF doc, taken from QST January 2001 -
Many NDB radio enthusiasts publish their reception logs on the web. A completely separate system designed for individual listeners to make their own logs and obtain statistics on NDBs, DGPS and now Navtex Stations they have received. Log listings can be exported in a multitude of formats and then emailed to the NDB List -
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A 21 MHz Four Square Beam Antenna This popular antenna for the lower bands, can also work well on 15 meters, QST Article