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This is a picture of a schematic diagram of a multifunctional interface for Yaesu FT-8x7 Series Transceivers. It will work for Yaesu radios like FT-897 FT-857 FT-817

A **90-foot tall** top-loaded vertical antenna for the 160-meter band is detailed, constructed from aluminum irrigation tubing. The design incorporates four sets of four guy wires for structural stability, essential for an antenna of this physical size. This _monoband_ vertical is optimized for low-band operation, providing a robust solution for DXing and contesting on 1.8 MHz. The document includes specific construction methods for assembling the aluminum irrigation tubing sections and securing the guy wires. While a full NEC model is not explicitly provided, the physical dimensions and construction materials are sufficient for replication by experienced builders. The antenna's height and top-loading configuration are critical for achieving efficient radiation on 160 meters, particularly in minimizing ground losses.

A free to download and print, amateur radio station log sheet in a paper US letter format

Download the PDF with USA Amateur radio HF band plan and common country prefixes updated in 2008 by Icom

W3FF article about the buddistick portable vertical antenna in a PDF file

An interesting article on NVIS antennas, explaining basics of NVIS antennas and the main usage of this particular aerials by Patricia Gibbons

KaWin is a Windows software that supports multiple Kantronics TNCs and multiple radio transceivers with an intuitive, graphical interface, setting a new standard of performance for digital radio communications. Software is not supported anymore.

A moxon antenna project for 40 and 30 meters

Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS

A project by DL5DBM for a VHF UHF antenna suitable for handheld transceivers

WinTone v2.02 is a windows DTMF Decoder, run on old windows versions only.

The W8JK is a famous and effective DX antenna, first built by John Kraus, W8JK, in 1937. A Beam antenna with two parallel dipoles driven with opposite phase, with a close spacing of an eighth of a wavelength.

This program descrambles band inverted encrypted transmissions, usually found on VHF/UHF. It uses a NCO (numerical controlled oscillator) to re-produce the originally inverted audio band.

A simple keyer which can be built for as little as $6 with some junk box parts. Although this circuit is not a true iambic keyer, it is capable of producing perfectly sounding CW.

adsbScope is a freeware Windows application designed for processing _ADS-B_ (Automatic Dependent Surveillance-Broadcast) frames received from a compatible decoder. It identifies aircraft, calculates their real-time positions, and presents flight parameters in both alphanumeric tables and a graphical display. The software interfaces via a virtual COM port, receiving raw frames to provide detailed situational awareness, including a global coordinate grid, continental coastlines, over 4,000 **airport** locations, and major cities. Users can overlay OpenStreetMap tiles and view world state boundaries, with each tracked aircraft rendered with labels showing altitude, speed, heading, squawk code, and flight identifiers. When paired with the adsbPIC-decoder, adsbScope enables advanced hardware control, allowing users to toggle data filters for specific frames like DF17/18/19, adjust analog signal thresholds for reception fine-tuning, and manage system resets or bootloader activation directly from the PC. This functionality provides a customizable toolkit for hobbyist radar listeners, offering a robust alternative to commercial tools for processing aircraft data. The software displays up to **1090 MHz** transponder data and can track aircraft up to 250 nautical miles.

Ham Radio applications with the Arduino micro-controller presentation

The ITU and CQ Zones Map is a printable two-page PDF provided by Icom, displaying the world divided into ITU and CQ Zones. The purpose is to assist radio amateurs in identifying and understanding these zones for communication purposes.

An horizontal full wave wire loop antenna for the 80 meters band by W4HM

WA2UGT X-beam antenna for 17 meters band

Presents G0GSF Brian's ZS6BKW antenna, a refined iteration of the classic G5RV, offering improved performance across multiple HF bands. The design emphasizes specific radiator and ladder line lengths to achieve lower SWR on 40m, 20m, 17m, 12m, and 10m, making it a practical choice for operators seeking a single wire antenna solution. The document includes critical dimensions for the flat-top and the 450-ohm ladder line section, which are key to its multiband resonance characteristics. Unlike the original G5RV, the ZS6BKW aims for direct 50-ohm feedpoint impedance on several bands, reducing the need for an external antenna tuner. My field experience with similar optimized dipoles confirms that precise construction, particularly the ladder line length, is paramount for realizing the intended SWR benefits. This design offers a compelling alternative for hams with limited space or those preferring a less complex antenna system.

Based on a W4TWW project and modified by KN4LF

Demonstrates building a basic _VOX circuit_ to add voice-operated transmit functionality to HF transceivers that lack this feature. The design utilizes a _1458 dual op-amp_ (two 741 op-amps in one package) to amplify microphone audio and act as a comparator, driving an NPN switching transistor for PTT control. A capacitor, C2, provides the necessary delay before unkeying the PTT, with a variable resistor, R6, allowing adjustment of the VOX level for specific microphones or voices. This low-cost circuit, detailed with a full parts list, offers a practical solution for hams seeking to enhance their budget HF rigs. The author, N1HFX, provides guidance on initial setup, including advice on microphone gain and the use of headphones to prevent speaker audio from re-keying the transceiver. Modifications for adjusting delay time are also included, suggesting increasing R8 to 10K for more delay or decreasing C2 to 22µF for less.

A Quad Fractal Antenna for 20 meters band by F3DD

This article describes a simple, inexpensive, dipole antenna that will rival the performance of a ten-meter beam.

NuMorse 2.20.0.0 for Win 7/Win 8/XP/Vista/Win 10 A complete rewrite of the original NuMorse used by thousands of radio amateurs to gain and upgrade their licenses. NuMorse offers an intermediate feature set that is somewhere between the lean and mean NuCode program and the vast array of features supported by NuMorse Professional. But NuMorse is no cut-down program. It has several unique features not found in other Nu-Ware products as well as a compact and intuitive set of controls that you will be able to learn quickly.Product is no more developed and out of support.

Freeware Hellschreiber decoding program for windows by Nino Porcino

Phased array Ground Planes antennas for 144 Mhz

Download ex1726 a 32-bit DOS radio control program for the ICOM M700PRO, M710 and M710-R NMEA computer interface.

This is a hex beam designed for six meters. It has three elements with a turning radius of 54 inches. This antenna can be built from low cost materials available from the local hardware store. By WB3BEL

Phased arrays of short vertical antennas. A technical notes from Butternut antennas on phased vertical arrays

The original G5RV antenna system consists of a center-fed horizontal 102' wire plus a 34' length of open-wire 525-Ohm feeder. Louis Varney, the antenna system's developer, intended two other features. Learn more at Cebik website

Radio Incident Command Kit project is described in this article loaded with many pictures and go-kit composition.

Mose Trainer by G4FON is a free windows morse code training program developed using the Koch method. Sends words simulating real morse code transmission, with QSB and QRM, allow change speed tone and many other settings. Download the kochmorsetrainer_install file and start learning Morse Code.

A 40-meter reversible _Moxon rectangle_ antenna project details its construction and performance, featuring 51-foot long sides and 7.7-foot turned-in sections. The design incorporates a 16.5-foot boom, with elements spaced 1.1 feet apart, constructed from #14 covered wire. It utilizes two double-pole relays for switching between NE and SW directions, achieving F/B ratios up to 40 dB on CW and 30 dB on SSB, with distinct reflector stub settings for each mode. This antenna replaced a full-size 2-element Yagi, demonstrating comparable forward gain while offering superior F/B ratios and directional flexibility. _EZNEC_ modeling indicates only 0.2 dB less forward gain than the Yagi. The system uses no baluns, relying on half-wave feedlines and switched stubs for impedance matching. The antenna is tree-supported at 45 feet, with its effective radiation height modeled at 80 feet due to local terrain, enhancing its performance over a nearby lake.

A free to download and print, log sheet in A4 paper format for amateur radio stations

Making a 4:1 balun with a nescafe coffee jar lid and a toroid

This very large moxon antenna resonate on 80 40 and 10 meters, has been used for CQWW 2006 by a YU team project

A shortened multiband antenna, about 23m long, for 80m - 10m bands with a low SWR (<1.3) on 80m and 40m, and < 3 till 10m. Bandwith on 80m is 300kHz

The CWCom application, a free software utility for Windows, facilitates Morse code communication over local area networks or the internet. It provides functionality for both transmitting and receiving CW, with an integrated capability to translate incoming Morse code into plain text and encode outgoing text messages into Morse code or a visual flashing light sequence. This feature allows operators to engage in CW communication without requiring prior knowledge of Morse code. The program has been tested and confirmed compatible with _Windows 10_ operating systems. Its core utility lies in enabling real-time text-based chat, where messages are converted to and from Morse code, offering a unique digital mode experience. The software's design focuses on accessibility, providing a bridge for those new to CW to participate in Morse code exchanges.

The varieties of twinlead J-Poles and some performance standards, L. B. Cebik, W4RNL

46ft multi-band antenna for small gardens. Works well on 80m. An excellent DX performer and is an ideal replacement for your half size G5RV

The total length of the inverted L is 240 feet, which is 7/16th of a wave length long. It has a 92 foot horizontal linear load section 1 foot above ground that terminates into a home-brewed parallel network tuner by KN4LF

Inline RF Power & VSWR Meter. A DIY meter 0 to 30 Watt with Average and Peak. Circuit Description, Arduino Nano software code and part list to DIY your own Digital SWR Meter

Designing quagi and yagi antennas on 2 Meters, some preliminary notes by Cebik, W4RNL

A Primer for the new Packet Radio operator

Comprehesive page on TS-940 TS-940 reference maintained by ZL4AI Jeff

This free PDF file contains two Worldwide grid square maps. The first map displays the fields (first two letters of a maidenhead locator) while the second includes also squares (third and fourth digit) and it can be useful to determine what is your ham radio grid square. PDF file can be enlarged and scaled to A3 and higher dimensions.

When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort.

Great first time J-pole project. Covers most of the basics. This small and thin design also makes it good for several stealth applications.

Portable Vertical Antenna for 75m and 40m featuring Low radiation angle for DX, easy to install and to match 50 ohms