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Presents an online callsign lookup service, QRZ.RU Callbook, which offers a searchable database for amateur radio operators. The resource details its extensive collection, including more than 50,000 records for **CIS (Commonwealth of Independent States)** callsigns and over 1,400,000 international entries. It enables users to search for existing callsign records and facilitates the creation of new entries, contributing to a dynamic and expanding repository of amateur radio data. The platform's primary function is to serve as a **callbook**, providing contact information and other details associated with specific amateur radio callsigns. Access to detailed information within the database is available to registered users, indicating a tiered access model for its comprehensive data. The service is maintained by Sergey, UA9OTY, ensuring a degree of accountability and expertise in its operation.

Explains the Federal Communications Commission (FCC) vanity call sign program, outlining the specific rules and procedures for amateur radio operators in the United States to obtain a personalized call sign. It details the eligibility requirements based on license class, the application process using FCC Form 605, and the various group formats (e.g., _1x2_, _2x1_, _2x2_) available to different license classes, such as Extra and Advanced. The resource clarifies the priority system for vanity call sign requests, including previous holders and close relatives, and discusses the typical processing times for applications. It also provides insights into how the FCC assigns available call signs and offers practical advice for increasing the likelihood of securing a desired call, referencing the _ARRL Letter_ for updates.

This little antenna is cheap and easy to build, lightweight, and very functional on 2 meters and 70 centimeters by NA4IT

A vertical linear loaded antenna for 2 meters band in italian

Rhombic antenna experiments by Jelmer PA5R

A preamplifier project based on Rainer DJ9BV project, in french

W5GVE article on homebrewing a 144 MHz DDRR antenna for mobile use

K0EMT 160 meters sloper antenna

AA5TB home made CW paddles, pictures and construction details

A homebrew project for a multiband end-fed antenna made with a single FT140-43 and 50pf capacitor and 20 meters of wire.

A simple circuit to homebrew your own headset for the Yaesu FT-817

Answers to frequently asked questions for newcomers to the sport of amateur radio contesting.

Yupiteru indistries web site, japanese only.

A javascipt online calculator for 2 and 3 element beam antennas. Just input frequency and will diplay element dimensions and spacing. Measurements in Feet and Meters by G4VWL

Constructing a linear focus parabolic antenna for WiFi operation involves precise metalwork, as detailed in this project. The author, AB9IL, shares a build that can be completed in a few hours, emphasizing the hands-on process of shaping and assembling metal components. This design aims to provide enhanced signal range for 2.4 GHz wireless networks, a common challenge in many ham shacks and home setups. The project outlines the practical steps required, from initial measurements to the final assembly, including cutting, bending, and bolting various metal parts. While specific gain figures are not provided, the parabolic design inherently offers significant _directional gain_ compared to omnidirectional antennas, making it suitable for point-to-point links or extending network coverage over distances. The construction process focuses on readily available materials and basic shop tools, aligning with the DIY spirit prevalent in amateur radio. This antenna project is presented as a straightforward build, requiring attention to detail in fabrication to achieve optimal performance.

Modifying the _ICOM IC-706MKII_ transceiver for out-of-band transmit capability involves specific surface-mount device (SMD) removal on the main circuit board. This procedure enables transmit functionality from 0.5 MHz to 200 MHz, excluding the commercial FM-Wide broadcast band, significantly expanding the radio's operational frequency range. The modification requires careful handling of small components and a fine-tipped, low-wattage soldering iron. Prior to beginning, all programmed memories and initial setup configurations must be noted, as the modification process will erase them. The instructions detail the necessary tools, preparation steps, and the precise location of the two SMD diodes to be removed. These diodes are situated near an oblong crystal can and a test point labeled _CP3_ on the main board. Successful completion returns the unit to its default configuration, necessitating manual reprogramming of memory channels and initial settings. This project is suitable for operators with experience in SMD work and fine soldering.

Pictures and circuit diagramm to build this power amplifier for 2 meters

Described is a simple inverted-V antenna which, when used with a balanced ATU, can be used on all the main Radio Amateur HF bands (80, 40, 20, 15 and 10m). The cental support is made in such a way that the wire can be coiled up for storage when the antenna is taken down.

The alternative multi-band solution, covers more bands than a G5RV, light weight, won't damage your trees.

Clips of DX audio, some dating back to the late 70's to early 80's and up to March 2001

This signal generator is intended for realignment of radio receivers

Developed by IZ3MEZ offer a click and show WW locator information using Google Maps API interface.

Homebrew project of a vector network analyser VNA by N2PK

ScanOhio Marine Radio frequencies

Some interesting mods for the 847

Pictures and calculated values for this home made magnetic loop antenna for the 160 meters band by HB9MTN

A 144 MHz six element yagi beam antenna plan

The Moxon Rectangle is growing in popularity as a compact 2-element array that approaches a full-size 2-element in gain but with a far superior front-to-back ratio and a direct match for the standard 50-Ohm coaxial cable.

How to create a simple but effective half wave dipole, illustrated instrucions on how to build wire antennas

Electronic circuit and components layout fot this VHF Preamp

CocoaModem is an opensource MacOSX application which implements modems (modulator-demodulators) for RTTY PSK MFSK Hellschreiber CW SITOR HF-FAX provided by W7AY

The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.

Assorted Grounding Hints and Kinks and Technical Correspondence, Grounding Techniques, Conductivity in the Cold, Cold Ground, Is Your Radio Equipment REALLY Grounded?

Sound samples of the transmission modes recorded at 11025 samples per second, mono and the message in all of the samples is the same: "the quick brown fox jumps over the lazy dog 1234567890".

Located in Mareeba, Australia.

Project and schematic of a regenrative receiver by AA5TB

A 40m through 20m QRO End Fed Half Wave Antenna Coupler by Steve Yates - AA5TB

Mizuho Tsushin Co. was a small Japanese manufacturer of QRP radios and kits, shortwave receiver accessories, and AM broadcast band receiver kits and antennas

pictures of a 80 mt band EH antenna by YC5NBX

An experimental fractal Quad antenna for 10 meter band project by AG1LE

It consists of a group of JavaScript driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. Offer calculators for Resistors, capacitors, inductors, power supplies, filters, attenuators and antennas

Determine the K-Factor used as a multiplier when constructing half-wave antennas.

Audiocorder is a VOX program which allows your Macintosh to act as an audio recorder

Homebrew with CF300 DGMF with about .24 dBD gain

Video construction of a multiband HF trapped dipole antenna based on a variation of the classic W3DZZ design

JTSync is a simple utility that provides the ability to synchronize your computer clock over a network with world-wide NTP servers. When the Internet connection is not available, JTSync allows you to make time adjustments based on decoded QSOs within the WSJT-X application.

2 meters band VHF dipole with gamma match system

A novel approach to aerial evaluation with diagrams and graphs by G3CWI

Satellite Finder is a way to accurately point satellite dishes at communications satellites in geostationary orbit.

MARS CAP Mod for TS-570