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List of Ham Radio Emergency Items. A list developed to give a starting point that the user can develop his or her own list if items from

Icom IC-51A out of the Box Programming Instructions PDF file by dstarinfo.com

A tutorial on using RF frequency counter, how a digital frequency counter works, includes frequency counter specifications and best practices in setting counter accuracy and resolution

50MHz DX Bulletin edited by O. Bjorn Matt Madsen

A summary or tutorial about the basics of the spectrum analyzer, what it is and what it is used for.

The NWAPRS is here to support APRS events, activities and amateur radio enthusiasts primarily in British Columbia, Alberta, Northwest Territories, Washington, Oregon, Idaho, and Montana

Home of FM & TV DX in the UK

CW Keyer Kit with capacitive touch paddle, with a lot of nice features. Easily expandable to a Morse code decoder

Kenwood Portable SSTV device

An overview of the basics of the horn antenna used in RF microwave applications.

Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.

3D2C ONLINE LOG for conway reef 2012

Antenna gain and directivity explained in this article at radio electronics antenna pages

ARRL web batteries articles and web links

High Speed Meteor Scatter (HSMS) e-mail reflector

N4KGL review of the Elecraft KX3 transceiver based on first experiences in portable operations.

Demonstrates the fundamental principles for connecting a personal computer to a ham radio transceiver, specifically for utilizing sound card-based digital mode software like those in the MM Hamsoft suite. It details the basic hardware setup, emphasizing the use of shielded leads and proper audio routing from the radio's output to the sound card's input, and from the sound card's output to the radio's microphone or data input. The resource highlights the critical need for transmit attenuation, suggesting a 100:1 voltage divider to prevent overdriving the transmitter's audio stage, and mentions the optional addition of ferrite beads and decoupling capacitors for RFI mitigation. The guide also points to external resources for more detailed pin-outs and interface schematics, such as a specific QSL.net page, and recommends consulting the help files within MM Hamsoft programs for interfacing specifics. It underscores that while the process is straightforward, understanding the audio level management and proper cabling is key to successful operation. The author, VE5KC, provides practical advice drawn from common issues encountered by operators setting up digital mode stations.

Yahoo Group dedicated to the Amateur Radio Community, not the Commercial Sector.

Distributed Antenna Systems technology used for gaining better coverage and using a lower power.

Official kenwood document explaining proper procedure to upgrade firmware on a Kenwood TS-590S

Fifty-three digital modes, including PSK31, RTTY, and JT65, are explored in this resource, providing detailed descriptions of their underlying technologies and typical use cases. It covers error correction methods like ARQ in PACTOR and FEC in JT65, alongside modulation schemes such as FSK and PSK. The content highlights the evolution of digital communication from traditional TNC-based systems to modern sound card implementations, emphasizing the role of personal computers in advancing these modes. Specific modes like AMTOR, PACTOR, and G-TOR are discussed, noting their baud rates and error correction capabilities. For instance, AMTOR operates at 100 baud, while PACTOR offers 200 baud with Huffman compression. The article also delves into newer modes like MFSK16, which uses 16 tones and continuous Forward Error Correction, and Olivia, capable of decoding signals 10-14 dB below the noise floor. Each mode's bandwidth, speed, and resilience to propagation challenges are examined, such as MT63's 1 KHz bandwidth and 100 WPM rate, or Hellschreiber's 75 Hz bandwidth and 35 WPM text rate. The resource also lists predominant USA HF digital frequencies for bands like 160, 80, and 40 meters, specifying segments for PSK31, RTTY, SSTV, and Packet. It includes links to freeware and shareware sound card software such as Digipan, FLDigi, and MixW, enabling amateurs to experiment with these modes.

Smart antennas or the adaptive antenna array and smart antenna technology used with SDR, cognitive radio, MIMO, and other new technologies.

Online web SDR from central part of Ukraine powered by OpenWebRX KiwiSDR at UR5VIB

The resource provides an interactive map interface for locating amateur radio license holders across the United States. Users can input a _callsign_, _gridsquare_, zip code, or street address to center the map, which then dynamically populates with station markers. This functionality allows for precise geographical searches, revealing the distribution of hams within specific areas. Upon initial search, the map renders with adjustable zoom and pan capabilities. A key feature is its automatic reload mechanism: after two seconds of inactivity, the map updates to display stations within the newly viewed area. This ensures that the displayed data remains relevant to the user's current focus, whether exploring a densely populated urban center or a more remote region. Further interactive elements include clickable gridsquare labels, which re-center the map, and a "Show gridsquares" checkbox for toggling grid line visibility. Clicking on individual station markers reveals a popup containing the licensee's name and address information, making it a practical tool for geographical station identification.

An overview of digital HF radio operating modes includes a sample audio recording of each digital mode by WB8NUT

ICNIRPcalc allows you to calculate safety distances for many know amateur radio antennas with respect to ICNIRP limits by DL9KCE

The receiving antenna setup for the top band, made with a 9 elements vertical antenna array, remote controller and remote relais.

The basics of radio receiver dynamic range performance used for specifying the performance of radio receivers used in radio communications systems.

An overview of the development of the Morse key for sending the Morse Code, from the first camelback keys, through straight keys and sideswiper keys to the semi automatic keyers including the Vibroplex to the modern electronic keyer.

About antenna or aerial resonance and bandwidth and the impact of RF antenna resonance and bandwidth on radio communications systems.

Article on antenna feed impedance and the importance of matching RF andtennas to feeders, including notes on Radiation resistance, loss resistance, and efficiency are also detailed.

Introduction to shortwave propagation

FT-817 Information & answers to common questions including widebanding

A Pan Adapter project for a PICASTAR transceiver

Article on propagation basics. The ground wave used for radio communications signal propagation on the long, and medium wave bands for local radio communications

Linux Open Source and ham radio for everyone blog

High Performance Communications Receiver AKA, The Progressive Receiver

overview of radio signals and radiowave propagation and how different areas of the atmosphere affect radio communications.

Dopller effects on satellite tracking

Descriptions, summaries,and tutorials about electronic circuits and electronic circuit design including amplifiers, attenuators, logic, transistor, operational amplifiers and much more

Propagation forecast for the southern African region by SANSA

How to learn Morse Code, a web site dedicate to morse code learning

Article on how to use logic analyzers for testing complex logic-digital circuits

Introduction to troposcatter or tropospheric scatter propagation using the troposphere

An introduction to develpment of morse keys in radiotelegraphy history

PSK Reporter provides a real-time visualization of amateur radio digital mode reception reports, aggregating data from a global network of monitoring stations. This platform is particularly useful for operators utilizing modes such as FT8, FT4, and PSK, allowing them to observe signal propagation paths and assess their station's reach. The interactive maps display reception reports, enabling hams to analyze band conditions and optimize antenna performance for various frequencies and times of day, aiding in understanding ionospheric conditions. Operators can filter reports by callsign, band, mode, and time, gaining insights into specific propagation events or evaluating the effectiveness of their transmit setup. The data collected helps in predicting optimal operating windows for DX contacts across various digital modes. Philip Gladstone is the contact person for comments and discussions regarding the system.

Local APRS info & Tracking

Discussion of radio equipment made by Kenwood

Official Kenwood memory control program for TM-V71A / TM-V71E TM-D710A / TM-D710E RC-D710

How to configure the ICOM IC 7100 to correctly work with FLDIGI on Windows 7 64 Bit. How install USB drivers and how to properly set COM ports and how to configure CI-V