Search results

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

A list of all IOTA reference numbers and IOTA groups for the Islands On The Air award, personalised to your own QTH

Freeware software that synchronize your PC's clock. Dimension 4 monitor your Internet connection and automatically adjust your PC's clock when you're online at an interval you specify. Windows version only.

Schedules and local radios broadcasting from and to Iraq during war.

The document discusses a two-element parasitic Delta-Loop array for the 40 meters band, aimed at radio amateurs interested in antenna projects. It provides detailed plans and instructions for building a homemade Delta-Loop antenna.

A potpourri of 160-Meter vertical antennas and modeling issues, inverted-L, 3-element parasitic array, 1/4-wavelength monopole

QRP kits

A free to download and print, paper log sheet for shortwave listerners in PDF format.

Coral Springs Police and Fire Dispatch Florida

Using moxon rectangles for WARC-Band antennas

Radio-TNC wiring diagrams index

N0KHQ Moxon rectangle for 17 meters, constructed from RG-58 coaxial cable

Approximately 400 kHz is the primary frequency for Navtex broadcasts, a crucial maritime safety information system. This legacy software, _Frisnit Navtex Decoder_ version 2.1.5, provides a means to decode these messages directly from an amateur radio receiver's audio output, fed into a PC's microphone input. It operates by processing the audio stream, extracting the FSK (Frequency Shift Keying) data, and presenting the decoded text on a Windows platform. Despite being unsupported and no longer under active development, the application remains functional across a wide range of Microsoft operating systems, from _Windows 95_ through _Windows 11_. Its utility lies in offering a straightforward, no-cost solution for hams and SWLs interested in monitoring Navtex transmissions without specialized hardware. The software's design focuses on simplicity, allowing users to quickly set up and begin decoding maritime weather forecasts, navigation warnings, and other safety-critical information. It leverages the PC's sound card, making it accessible with minimal additional equipment beyond a receiver capable of tuning to the Navtex frequencies.

6m to 40m EndFed Half Wave Antenna project produces an inexpensive, multiband, end fed HF antenna matchbox that is quick and easy to setup and use.

This signal generator is intended for realignment of radio receivers

Theory, Modeling, and Practical Applications By W5JCK, presentation in PDF File. This presentation focuses on Near-Vertical Incidence Skywave (NVIS) antennas, which are crucial for short-range radio communications, particularly in military and emergency contexts. It explores NVIS theory, antenna models, and installation criteria while debunking common myths about reflectors. Key topics include usable frequency bands, optimal installation heights, and the impact of soil quality on performance. The presentation outlines the best bands for daytime and nighttime use, emphasizing the importance of understanding propagation characteristics to enhance communication effectiveness within 200 to 300 miles.

Interesting variant on the 3-element Yagi. Lightweight fiberglass (or similar) tubes supporting a wire structure of elements

ScanOhio Marine Radio frequencies

The article "Exploring the World of 10 Meter Beacons" by Ken Reitz, KS4ZR, provides an in-depth look at 10-meter beacon operations, focusing on their utility for propagation analysis. It details FCC Rules part 97.203 governing beacon stations, including license requirements, power limits (under 100 watts), and the specified band segment of 28.200-28.300 MHz for U.S. operations. The content highlights the diversity in beacon construction, from converted CB radios to home-brew QRP transmitters, and discusses the robust operating conditions these 24/7 stations endure. The resource presents several case studies of active 10-meter beacon operators like Ron Anderson KA0PSE/B, Domenic Bianco KC9GNK/B, and Bill Hays WJ5O/B, detailing their equipment, antenna setups, and typical signal report volumes. It also introduces the NCDXF/IARU International Beacon Project, which features 18 synchronized beacons worldwide transmitting on 28.200 MHz at varying power levels (100W, 10W, 1W, 100mW) to facilitate propagation testing. The article also covers the PropNet Project utilizing PSK31 on 28.131 MHz and the 250 Synchronized Propagation Beacon Project on 28.250 MHz. Practical advice for monitoring includes using the RST reporting method, understanding the impact of the solar cycle on 10-meter propagation, and tips for setting up a personal beacon, such as frequency selection and power output considerations. The IY4M Guglielmo Marconi Memorial Beacon Robot on 28.195 MHz is also mentioned for its automatic QSO mode. The article concludes with a list of other resources for 10-meter beacon information.

7 dB for 7 Bucks, a 2 meter beam antenna for the cost of a fast food meal!

Horizontal HF 6-Band turning arranging emitter with 2 elements Maria Maluca

ARRL pdf file on how remove car noise from your radio. Modern vehicles are RF noisy environments. Come learn how to identify and silence yor mobile noise sources, by WA6PDP

An easy to build antenna for ground reception of NOAA weather or amateur satellite signals. Double cross antenna by Gerald Martes

A base station antenna you can easily build for 146,220 or 440 MHz, with performance similar to a J-pole but smaller and less obstrusive

Vox Recorder is a Windows utility wich allows recording sound from an audio source only when an audio signal is present; its main purpose is to avoid the recording of the silence eventually present at the input.

Stream is a software that implements MFSK16 and MFSK8 modes designed by me and Murray Greenman ZL1BPU. It also offers a series of experimental modes based on FEC, interleaving and several modulation techniques (PSK, QPSK, MSK).

The webring that contains lots of links relateed to pirate radio

Free Donwload of the PDF file of ITU and CQ zones of the world, made available by Icom America

US Amateur Radio Band Plans by ARRL

Build your own home made Antenna Analyzer with an arduino micro, or a cheeper one with a pic processor

how to easy and quickly unsolder and recover electronic components from old electronic board (SMD and not) by iz7ath Talino

The ICOM IC-7300 is a cutting-edge HF transceiver that has garnered significant attention since its release. This review, published by ARRL in QST, provides an in-depth analysis of its features, performance, and usability. The IC-7300 is known for its direct sampling technology, which enhances its sensitivity and selectivity, making it a favorite among amateur radio operators. The review covers various aspects, including the user interface, audio quality, and overall operational capabilities, providing valuable insights for both new and experienced hams. In addition to its technical specifications, the review discusses the IC-7300's performance in real-world scenarios, such as DXing and contesting. It highlights the transceiver's ability to handle weak signals and its versatility across different modes. The review serves as a helpful guide for those considering the IC-7300 for their station, offering a balanced perspective on its strengths and potential drawbacks. Overall, this review is an essential resource for anyone interested in the ICOM IC-7300 and its place in the amateur radio landscape.

A reference matrix of Kenwood Microphones by models with connector specifications and transceiver compatibilty.

Tombone VHF antenna for 146 MHz ad designed by YB8EIP

A quarter wave vertical end-fed antenna for the 40 meters band. As all vertical antennas, also this aerial requires a good earthing system. In this project the ground is composed by twelve 4, wires buried in the lawn by using a spade to create a slit to drop the wire into.

Lets you listen to your scanner across your own network, or via the internet. Shoutcast/ICEcast compatible broadcasting for Uniden and GRE scanners. Broadcast your audio from your PC. ScannerCast is a specialized broadcasting solution that enables users to stream scanner audio feeds over the internet. This software supports both Uniden and GRE scanner models with tag information capability, while providing audio-only functionality for other scanners. Compatible with standard streaming protocols, ScannerCast allows remote listening via common media players without requiring specialized client software. The program features customizable tag display, adjustable bit rates, and seamless integration with Radio Reference. Its efficient design replaces multiple legacy applications while improving tag/audio synchronization. ScannerCast operates efficiently across various Windows environments, making remote scanner monitoring accessible from any location with internet connectivity. Scannercast is no more supported or developed by it's author.

Download chip64, freeware windows digital mode by IZ8BLY Nino

A 40 80 dipole antenna design by WA6ESC PDF File

MT63 soundcard program for Windows by IZ8BLY

30/17/12 and 20/15/10-Meter Tribanders and a 40 meters inverted V wire yagi antenna

W4RNL tutorial on on inductively coupled (link-coupled) antenna tuners

Put up the longest dipole you can fit, feed it with open wire line, connect it to the balanced output of your tuner and poof! Instant multiband antenna. Is life really that simple?

Pre amplifier using a 2N5109 for the 160 meters band

Build a spiderbeam from scratch for 20-17-15-12-10 meters band

K6ZB Bruce presentation of technologies to allow ham radio operate via internet

This note describes a relatively small, but efficient, loop antenna initially created for portable operation. With suitable modifications, it can be adapted for fixed station use. In this age of CC&Rs, an antenna similar to this may very well be the answer to your problems. Have a look, be inspired, get out the torch / soldering iron and create your own version!

The design of Ruthroff broadband voltage transformers

Moxons work great, and they take up less space than full size two element Yagis

A popular 2 meter antenna returns in an improved, easier to reproduce form, 2008 QST article

Cruise Ship and Maritime Monitoring Frequencies - cruise ship frequencies maritime scanning radios vhf uhf