Paul McMahon presents a compact VSWR meter designed for QRP portable use, ideal for SOTA operations with rigs like the FT817. The device, constructed from readily available components, employs a simple resistive bridge for wideband performance from 1.8MHz to 52MHz, with diminishing accuracy at higher frequencies. Key features include no need for external power, simple calibration, and operation with low power levels. The design, detailed with parts lists, schematics, and construction guidelines, ensures a 2:1 worst-case VSWR to protect transceivers during antenna matching. Calibration points are set for accurate VSWR readings at various loads.
Open source code to add CQ Zone, ITU Zone and Maidenhead Locator to your leaflet maps.
Paul McMahon details the design and construction of a four-element Yagi antenna for the 50-52.5 MHz range, published in Amateur Radio Magazine (Dec 2011). The antenna, featuring a raised driven element and a capacitive/DC connection using copper strips, maintains consistent VSWR and performance despite two years of weather exposure. The design utilizes inexpensive plumbing conduit for the boom and provides detailed construction guidelines, parts lists, and performance analysis through 4NEC2 simulations.
A guide to programming a Yaesu FT5DR under Ubuntu Linux using CHIRP and the USB-68 Cable. This operation that is usually very simple and easy to do under Windows, need more configuration efforts under linux os.
This article will introduce total beginners to Amateur Radio, more commonly known as ham radio or DXing. That includes the basic definition – what DX is, where it came from, and the couple primary types (passive and active DXing). A Very Historical Past Radio Home!! The different kinds of DXing are well separated, indicating that you are either just listening to more distant stations, or engaging in a direct communication with another amateur. Ham Radio DXers: Importance of the Internet While the article glosses over the technical aspects of Ham radio equipment much like several of his articles, it does touch on how important the internet is to DXers. These include link to locate active stations, learn signal proagation, and be a part of the Ham community online.
Online Coil Inductance Calculator. To calculate the inductance of a single-layer, air-core coil, just select the measurement units, enter the number of turns, the coil diameter and the coil length.
An FT-817 ceased transmission on the VHF 2m band, despite the other HF, UHF, and 50 MHz bands operating correctly. Suspecting an excess of input signal during FT-8 mode transmission, they conducted measurements with an oscilloscope, revealing a burnt-out PIN diode, identified as D3003, type HSU277, on the PA unit board. Following the replacement of this surface-mounted diode, their FT-817 resumed operation on the 144 MHz band.
Personal web site of FO5MD, OCEANIA Tahiti Island French Polynesia with information on personal activities, shack and antennas.
BC Amateur Radio South Of The Fraser. Coastal Ham Radio Club is for the amateur radio enthusiast. We are a group of local British Columbia amateurs who wish to socialize, learn, share and promote the hobby.
List of N4NJJ Repeaters by The Sin City Repeater Group, a group of privately funded repeaters in Las Vegas areas, most of the repeaters are mixed-mode machines. The system is linked locally in Vegas, and nationally.