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All bands HF mobile antennas manufacturer

Military antenna masts

Calculate design for a quadrifilar helicoidal antenna

This resource details the conversion of an 80m elevated vertical antenna to include 160m operation, focusing on a relay-switched design over a trap-based approach. It presents specific feedpoint impedance values, such as **32 ohms** for 80m and **14 ohms** for 160m, and discusses the challenges of SWR drift encountered with the prior trap system during RTTY contesting. The article thoroughly explains the design choices for elevated radials, referencing _N6LF QEX data_ to debunk common myths regarding radial length and height, demonstrating that non-resonant radials can offer superior current uniformity. The construction section provides practical insights into building the vertical, including guying strategies, material selection from scrap pipe, and weatherproofing the relay assembly. It highlights the use of a common mode choke for the relay switching line, measuring approximately 5K ohms on both 160m and 80m, and details the L/C matching network's role in achieving a 50-ohm match at the end of a 300-foot RG-11 run. The author describes a precise VNA-based radial trimming procedure, achieving resonant values within a 3 KHz range. The content emphasizes the practical application of theoretical antenna principles, particularly concerning the interaction between the vertical element, cap hats, and the matching network. It offers a candid assessment of component selection, such as using junkbox parts and acknowledging the need for future upgrades to static drain resistors. The article serves as a comprehensive case study for advanced antenna builders tackling multi-band vertical designs.

706 MKIIG picture and specifications by rigpix db

Power supplies, electrical testers, battery analyzers, cable tester, rf generators, spectrum analyzers, Digital/Analog Oscilloscopes, Multimeters , attenuators, frequency counter

Schematic for Data, power, CAT, Key and Mic connection interface cable

Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA

ARRL comparison of HF transceivers, including Elekraft, TenTec,Icom, Yaesu and Kenwood recent transceivers based on QST product reviews

Freeware windows program by VE3NEA that allow to view and edit the Master Callsign Database file used in many contesting programs, import and export callsigns, auto-download announced DX operations.

Excellent poster representing the electromagnetic spectrum from 31.2 mHz to 6.52 EHz, PDF file poster designed by Anthony Tekatch

Developed by Japanese 6 Meter Hams in the 1970's can be designed and built for almost any band

You can use almost any Icom handheld to contact your 2720H back in your vehicle for crossband repeating.

This program displays solar-terrestrial data for radio waves propagation that is provided by the N0NBH web-service.

Essential tower tool invented through necessity.

This free software is an application solely for the use of controlling the Kenwood TS-480. Can be used to edit, save, and export to the TS-480 information such as Memory, Menu, and Auto Mode frequencies.

Antenna accessories and related products

Ham radio dealer in Valencia Spain

Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency

This application note is designed to help the reader understand how balun transformers can be used in today's RF/Microwave communication applications.

DG6RBP homebrew project for a USB cable progtamming interface for the Yaesu VX-2 radio

A 50 foot tower setup with pictures and installation details

A Low -Power, Distributed Capacitance Twisted Loop , indoor portable HF antenna by Monty Northrup, N5ESE

The IndyScan website functions as a personal blog, documenting the author's experiences across various aspects of daily life, including travel, culinary adventures, and media consumption. Content frequently details personal trips, dining experiences in Indiana and other locations, and reviews of books, television shows, and products. The site also includes reflections on local events and personal purchases, providing a snapshot of the author's interests and activities. While the site's primary focus is personal narrative, it occasionally touches upon amateur radio, such as mentions of operating during a trip to Brookville, Indiana, or capturing a weather fax via shortwave radio. These ham radio-related entries are integrated within broader lifestyle updates, offering a glimpse into the author's engagement with the hobby rather than providing technical guides or detailed operational information. The resource serves as a personal journal, not a dedicated technical reference for amateur radio.

An 85ft wire fed against a 17ft counterpoise that works well in 80 and 40 meters

Radio Management Software for the Radio Shack® PRO-92, PRO-93, PRO-2067, PRO-2053, PRO-95 and PRO-96 multi-system trunking scanners.

This project was published in the April 2004 issue of the Australian magazine Amateur Radio, and has been designed using parts which are very readily available.

Build An Offset Attenuator by Joe Moell K0OV as featured in Homing In for May 1998

AOR USA Web site, manufacturer of base and mobile receivers, handheld receivers, digital voice modems, spectrum display units, frequency monitors and antennas

IC‐2300 MARS/CAP mod expanded frequency range 136‐174 MHz

Lan-Link and Lan-Link for Windows. Other software by G3ZCZ. Some of G3ZCZ's conference papers on amateur radio, and AMSAT editorials

Here you will find broadcast, pirate, and clandestine information including loggings, QSLs tips, and last-minute news.

CB, Hamradio informations & more ...

This group has been created to promote discussion relating to the EH Antenna. There should be many with experience with the EH Antenna, so don't be shy about asking questions on construction and efficiency.

The sun can power your Ham station and a whole lot more. Using solar power panel with a 12 volt battery can permit you to operate autonomously even for several hours without interruption.

A 2,4 GHz 13cm band quadrible qiad antenna with reflector offering a 14dbd gain

Sioux City Tri-State Area Fire/EMS, Sheriff, Police and Highway Patrol Live Audio Feed. Listen Sioux City IOWA live scanner

Cal-av labs, inc. (formerly california avionics laboratories, inc.) manufactures electronic instruments and systems for research and industry. we specialize in radio communications and research/electronic test products. Amateur radio yagi antennas, rotary dipoles, baluns, morse keys.

Have you ever wanted to listen in on a serious SO2R DX contest effort? hear what the low bands sound like from New England? enjoy a contest without having access to a radio? This is your chance!

Commercial software developed exclusively for scanning 25 to 1300 MHz. No other PCR1000 software offers as many innovative scanning features.

Generate QSL cards and labels in your own format. Donationware, windows program by Alpine software officially released for windows XP.

Online log for 5V7TT Togo dxpedition 2010. Offer QSL request service.

LAPD - Wilshire and Olympic Divisions Live Audio Feed using a Uniden 396T radio scanner

W3EDP multiband wire antenna, an extensive study and analysis of this antenna by W0ESE

Baluns for amateur and commercial radio.

This receive only loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts.

The page provides a utility to record QSOs for amateur radio operators, allowing them to send the recorded signal back to the other station. It addresses challenges with VOX capability in radios and offers solutions for different radio models.

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads

Receiving Common Mode Noise shows how lack of a balun can contribute to system noise

The Icom IC-7300 is a popular HF transceiver among amateur radio operators, known for its advanced features and performance. This modification guide focuses on enabling extended transmission capabilities, specifically for MARS and CAP frequencies. The instructions are based on the work of PA2DB and include detailed steps for removing specific diodes to unlock additional frequency ranges. Before proceeding with the modification, users are advised to take necessary precautions, such as ensuring the radio is powered off and using ESD protection. The guide emphasizes the importance of using appropriate soldering techniques and tools to avoid damaging sensitive components. A video demonstration is also provided to assist users visually in performing the mod. While this modification can enhance the functionality of the IC-7300, it is crucial to note that it may void the warranty and should be undertaken at the operator's own risk. The guide serves as a valuable resource for those looking to expand their operating capabilities with this versatile transceiver.