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This page allows you to calculate in the most accurate way high-Q inductor coils.

Ladder Line Myths, Line Types, Spacing and Impedance, Length by KV5R

Eham users reviews of the hustler 5 btv HF vertical antenna

Delta 160-meter receiving antenna used at FO0AAA

Custom Design T-Shirt with No Minimum order (you can buy just 1) and NO Setup Fee. Will transfer your Favorite Images from JPEG's and E-mail attachments and from photo prints to Custom T-shirts with unbelievable Crispiness and Clarity of true Color Reproduction. Our image transfer paper is 11.5" x 8" heavy duty industrial grade.

Servering the amateur radio community with a consolidated news center.

You wanna try to work modern satellite like AO-40 but have only one rig ICOM-706MKIIG ? This article will help you.

P49V Aruba Ham Radio Rental

K8CU builds a classic 1967 QST semiconductor project during the 40th anniversary year of the original project publication.

Eham.net review of ICOM IC-2720H

Ham radio news, views, the website that makes it's own gravy

Ham radio equipment eBay prices, adjusted for trends, filtered for accessories, leaving only condition and auction terms to affect the final price. Also direct links to auctions, searches and recommended sites for research, plus amateur radio station rigs, projects and antenna farm.

Earn your Technician or General Amateur Radio License in a one day course.

Decoding NOAA APT weather satellite images is achieved with a homebrew receiver and a Turnstile Cross Dipole antenna, feeding data to a Pentium-3 500MHz PC running Windows XP and the WXTOIMG program. This setup, operated by VU2IIA in Mumbai, India, focuses on capturing and processing signals from NOAA satellites to generate visual weather data. The blog documents the technical aspects of constructing the receiving station, including antenna design and receiver integration. It provides insights into the practical challenges and successes of amateur satellite reception, specifically for Automatic Picture Transmission (APT) signals. Operational details cover the software configuration and image processing workflow necessary to transform raw satellite data into usable weather imagery. The content serves as a practical guide for radio amateurs interested in satellite meteorology.

The 2 Meter 146mhz Slim Jim Antenna using aluminum tubing!

2 Meter Slim Jim Antenna Using 300 Ohm Twinlead

Heathkit Amateur Radio Repair, parts, and manuals. Amateur radio equipment sales and service.

Presents a Brazilian online portal dedicated to **amateur radio**, **CB radio**, and shortwave listening (SWL) communities. The platform facilitates free classified advertisements for radio equipment, including HF, VHF, and UHF transceivers, antennas, and accessories. It also aggregates a substantial collection of technical articles from Brazilian amateur radio operators (e.g., PY2DJW, PY1LJ, PY1LL/4LC), covering topics such as CW training with RufzXP, balun importance, and radio wave characteristics. Furthermore, the resource provides extensive links to Brazilian ham radio sites, clubs, international organizations, and official ANATEL (Brazilian National Telecommunications Agency) documents regarding licensing, equipment homologation, and regulations. The portal features sections for user evaluations of transactions, a "Top Ten" list of most visited pages, and a calendar of past and upcoming ham radio events across Brazil, including "Feirinhas" (local swap meets) and "Encontros de Radioamadores" (hamfests). It also includes a directory of ham radio related businesses and services in Brazil, such as antenna manufacturers (Diex), QSL card printers (Arte Final), and repair technicians (PY2MOK). The site also offers propagation maps, DX cluster links (e.g., DX-SUMMIT), and satellite tracking tools, making it a central hub for Brazilian radio amateurs seeking to buy, sell, learn, or connect with the community.

Activating a county for ham radio can be dangerous to your health!

KARSFEST, held at the Will County Fairgrounds. Sponsored by the Kankakee Area Radio Society. Large and well attended hamfest and computer show!

HAM-IV antenna rotor repari and restore

Examines the Icom IC-2100H 2-meter mobile transceiver, detailing its operational characteristics and user experience. The review highlights the clear, easy-to-read display with internal labels, the button-filled microphone's functionality, and the rig's physical construction, including its weighty heat-sink and lack of a cooling fan. It also discusses memory programming, the unique amber-to-green backlight color options, and the radio's performance against _intermodulation_ in urban environments, noting it performs "pretty darn good" compared to other rigs. The analysis delves into a significant low-voltage cutoff problem, where the microphone ceases to function below approximately **12.6 VDC**, rendering the radio receive-only or causing it to stick in transmit. The author describes testing the voltage cutoff, observing it fluctuate from _12.38 VDC_ to 12.69 VDC. An update from Icom involved a "factory update" to the CPU's control code, which is strongly recommended for early-serial number units to prevent operational failure in low-power emergency scenarios.

Radio Amateurs of Ankara, Turkey. English, Turkish, homepages of HAM's.

Personal review of the Yaesu VX-6R handheld transceiver

"W2IK's Personal experience being the first responder at ""ground zero"" during the WTC 9/11 disaster."

Explore this high-resolution ITU Zones Map, a critical reference resource for amateur radio operators, international broadcasters, and telecommunications engineers. Originally established by the International Telecommunication Union – Radiocommunication Sector (ITU-R) Broadcasting Services Division (1999), this chart accurately divides the globe into 90 specific CIRAF zones. This authoritative visual guide is indispensable for planning High Frequency (HF) radio propagation, scheduling international broadcasts, and verifying locations for radio contests and awards. Distinct from the 40 CQ Zones, the ITU zoning system provides the official administrative framework used for global frequency management. This digitally enhanced version ensures maximum clarity of zone boundaries and numbering (e.g., Zone 28 for Central Europe), making it an essential tool for technical accuracy in logbooks and station management. It serves as a trustworthy standard for educators, hobbyists, and industry professionals alike.

Modifications for motorola and ericsson radio repeater

SS232K - The simple and safe RS232 interface for Kenwood radios

This article contains the measurements for building a full wave loop using wire and length of 1/4 Wave Coax Matching Transformer

Homepage of Hong Kong's elite group of DX'ers

There's no longer any need to invent new swear words

A small antenna tuner for 14 MHz

Testing SWR on your antenna and getting the best performance from your investment by L.D. Blake, VE3VDC

Nifty! Quick Reference Guides and short form Mini-manuals and for Kenwood, Icom, Yaesu and Elecraft transceivers.

Schematic for AR-8000 programming cable

The RoadTrek design presents some unique challenges to us hams. Here an example of a VHF and HF antenna installation on a VAN

Discussion on W3EDP Antenna and grounding

EXTFSK.DLL is an MMTTY extension that interfaces MMTTY to a user-made hardware device via serial port, parallel port or USB

A cooperative venture between MSUARC and Calloway County Fire and Rescue

Cannot record CW message, AFSK not working, tracking not working, meter peak hold, on Yaesu FT-920.

Various configurations of the Z Match Tuner are tested for power efficiency over a wide range of antenna load conditions

Fellowship of Christian Amateurs meeting M-F on 40 meters

Extremely reliable FET preamplifier can handle several watts directly into either the input or the output without failure

This scheme can be used to combine two antennas

W0CUO Grand Island Amatuer Radio Society. Grand Island Nebraska.

An interesting article on how to make copper cactus J-Pole antennas

Eham FT-1000MP review

K4JRG GAP titan dx specifications

What little I know about ham ballooning by Dave Mullenix, N9LTD

A 144 Mhz Slim Jim Antenna, aluminum tubing version project by Mohammad 9W2WTF