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Homemade HF Tuner by PE1OPM

Build an HF antenna tuner by VK5AJL

A three tube regenerodyne receiver by Gary Johanson, WD4NKA

Operating a ZS6BKW antenna often involves understanding its lineage from the _G5RV_ design, with specific modifications by ZS6BKW to optimize performance on several bands. Through computational analysis and field measurements, the antenna's dimensions were refined to allow operation on 10, 12, 17, 20, and 40 meters without an antenna tuner. For 80, 30, and 15 meters, a tuner is necessary, though efficiency on 30 and 15 meters is noted as not particularly high. The physical configuration consists of two 13.755-meter radiating elements fed by a 12.20-meter section of 450-ohm ladder line. Tuning the antenna on the 20-meter band is critical, and any deviation in the ladder line's characteristic impedance necessitates recalculating the element lengths. The design is also referenced in the 12th edition of _Rothammel's Antennenbuch_, page 219. Proper common mode current suppression is crucial at the transition from ladder line to coaxial cable. This can be achieved with a common mode choke, such as several turns of coax wound into a coil or over a ferrite toroid like an Amidon T130. While a 1:1 balun is an option, it may introduce issues.

Mailing list for people who own or are interested the various Realistic DX series radios from Radio Shack/Tandy. The DX-160 and DX-302 are frequenty discussed.

Private homepage by DG8JZ with information about the VR5000 receiver including some usage tips. Mostly in german

Loop antennae have been used from ELF to UHF since the beginning of radiocommunications. At low frequencies, the main problem for loop antennae is to have enough sensitivity; the antenna being very small respect to the wavelength the collected energy is also small. To increase the output level the loop may be made resonant, so loosing it%u2019s intrinsic aperiodic characteristics.

Reviews of the FT-950 PEP-950 enhanced version. AKA Mark 2

40 meter vertical antenna construction, a shortened easy-to-build vertical, with no-radials, made from surplus military camouflage poles

This project is an interface box for the Yaesu FT-817 that includes a band output port, a computer serial interface, and a remote interface for the FL-7000 (and Quadra?) solid state power amplifiers

A vertical antenna specifically designed to work with the 80 meter CW beacon keyer

SH5 is easy to use contest logs analyzer which creates a variety of HTML statistics from the Cabrillo format log generated by most popuplar contest log software (N1MM Logger+, Win-Test, Writelog, TR4W and others). SH5 allows you to upload contest results to your web site.

There is considerable confusion about the various types of baluns, this article try to make it clear.

This page displays a 404 error, indicating the original content describing a simple _RS232 interface_ circuit is unavailable. The circuit was reportedly designed for older Kenwood transceivers and featured in chapter 22 of the _ARRL Handbook_. It likely involved basic electronic components for level shifting and signal conditioning between a computer's serial port and the radio's control interface. The intended project would have detailed the construction of a hardware interface, enabling CAT control for specific Kenwood models. Such interfaces typically convert TTL or CMOS logic levels from the radio to the +/-12V levels required by RS232, often utilizing ICs like the MAX232 or discrete transistor circuits. While the specific schematics and bill of materials are absent due to the page error, the context suggests a DIY electronics project for enhancing legacy amateur radio station functionality through computer control.

Yaesu VX-3R reviews by the eham members

An interesting and very detailed report analysis of three populare HF+6m transceivers. Yaesu FT-950, ICOM IC-7410 and the Kenwood TS-590S by AB4OJ

Baofeng UV-5R extreme Receive Modification

All about the JRC NRD-525 receiver. Modifications, review, manuals, tipd and tricks

Applying for an FCC vanity call sign requires navigating the _Universal Licensing System_ (ULS) database to identify available call sign blocks and specific desired combinations. The process involves submitting an online application via the FCC website, ensuring all instructions are meticulously followed to avoid rejection. Typical processing time for a vanity call sign application is approximately **18 days**, after which the ULS database reflects the updated license grant. Operators often seek vanity call signs for various reasons, including aligning with a new license class, desiring a shorter call sign for CW efficiency, or simply preferring a more memorable phonetics. The resource emphasizes self-application to avoid third-party service fees, directing users to verify availability through tools like Vanity HQ. Key steps include selecting a primary call sign and several alternates, ensuring the chosen call sign conforms to FCC rules for the operator's license class. Payment can be made online or via check, with prompt submission critical to prevent application dismissal.

WAS Map, worked all States by ARRL

Offers Scanners, Shortwave, Wide-Band receivers, accessories from Icom, AOR, Sangean and Grundig.

Sharing information on Topband Homebrew Antennas, Base & Mobile

FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

More links to Icom IC-746 resources on the web

The OK DX Club website serves as the home site for the OK DX Club, providing a variety of information such as hot news, propagation details, maps, QSL managers, software recommendations, useful links, and membership information. The site caters to amateur radio operators interested in DXing and offers a platform to share experiences, learn from fellow hams, and explore the world of DXing. The content is regularly updated to provide the latest information and resources for the amateur radio community.

A vertical dipole for 10, 15, 20 and 40 meters made adapting two Hustler Model 6-BTV antennas by w6sdo

Active filter design software for windows, AktivFilter 3 for the design of active filters tuned on the opamp type.

A home made vertical polarized moxon antenna for 144 MHz, includes dimensions, antenna pattern, SWR and antenna gain plots by WB5CXC

This simple 30m QRSS beacon is built entirely out of junkbox parts, the only component purchased specifically for this project was the 10,140kHz crystal. Hans Summers' 30m QRSS beacon project emphasizes simplicity and low cost, built almost entirely from reused parts. Key components include a 10,140kHz crystal, a 2N3904 transistor from a broken DVD player, and an ordinary LED used for frequency shift. The oscillator is stabilized in a polystyrene box, with power amplification driven by recycled copper PCB. Output power peaks at 360mW, and a custom 50-ohm dummy load manages heat. Though aesthetically unconventional, the beacon works effectively, fulfilling the project's low cost aim.

A six meter Moxon rectangle antenna. Includes high definition pictures and a detailed drawing by KG4JJH

Specializes in antique radio schematics and capacitors. carries antique radio schematic diagrams and electronic circuit service information for american, canadian and european antique radios.

Web Site of CB Radio station from Vernadsky Research Station on Galindez island 140URL9909

A site exclusively meant for the novice. Find all the information necessary to become an amateur radio operator! More India specific information.

This page shows W5AJ & KD5AAU setting up a self supporting crank over tower.

Amateur Packet Radio Gateways by dl1eis

A restored version of the original CQ DX Zones of the world

Yaesu FT-2000 FT-2000D Cable connections

Yet another G5RV antenna plan to build a G5RV Antenna for 80 to 10 meters usage

This project will enable you to build a monoband long wire inverted vee with 3/4 wave length sides that will have a bit of gain

An RF power supply for 144 MHz schematics and instructions

ARRL page on SDR technology

The NAVTEX system is used for the automatic broadcast of localised Maritime Safety Information (MSI) using Radio Telex (also known as Narrow Band Direct Printing, or NBDP).

HD Communications Corp specializes in **RF and microwave amplifiers** engineered for demanding communication, defense, and industrial applications. Their product line includes precision-built, high-power solutions, along with RF connectors, filters, HF cables, and various accessories. The company also supplies tower hardware, valves, and tubes, catering to a broad spectrum of radio frequency infrastructure needs. Beyond amplifiers, HD Communications offers a range of **RF filters**, including low-pass filters, antenna filters, and solutions for RFI/TVI mitigation. Their inventory encompasses essential components like coaxial cable and various connector types, supporting both amateur radio and professional installations. The company operates as a manufacturer and vendor, providing direct sales of its specialized RF products.

Memory manager for ICOM IC-706 MKIIG, IC-737, IC-7000, IC-746, IC-756 ProIII, Kenwood TS-570D, TS-570DG, TS-870, TS-2000 and Yaesu FT-920, FT-1000 , FT-2000, run on windows, free by OH2KXO

318 and 200 ft insulated towers

Modifications for the Yaesu FT-920

A portable 4 elements quad antenna for 144 MHz, 9 to 10 DBd forward gain, 30 DB front-to-back ratio, and 33 DB front-to-side ratio

N4ATS - Devoted to the Yaesu FL-7000 Amplifier. I have been rebuilding, repairing, and applying modifications to the Yaesu FL-7000 amplifier for 15 years. Over 200 units completed and counting!

Detailed picture of a FT-857D backpack by YO3HJV