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A study on 20m antennas by Kenny Silverman, K2KW

Direct QSLing require to correctly positioning the address to enable rapid optical reading and manual sorting and delivery

Presents a concise guide for Amateur Radio operators participating in Jamboree-on-the-Air (JOTA), an annual event connecting approximately 500,000 Scouts and Guides worldwide via ham radio. The resource details how to initiate a voice contact, including the use of "CQ Jamboree JOTA" and proper signal reporting with the RST system. It also outlines the typical exchange information, such as name, QTH, Scout rank, and age, encouraging participants to practice their responses. Authored by Bill Wetherill, N2WG, the brochure provides a practical phonetics chart and a comprehensive Morse code dictionary, including punctuation and prosigns like AR and SK. It clarifies rules for third-party operation under the direct supervision of a licensed operator, noting restrictions on international contacts without specific government agreements. Additionally, the guide lists recommended World Scout Frequencies for SSB and CW across 80, 40, 20, 17, 15, 12, and 10 meters, emphasizing courteous operating procedures. It includes a section on common Q-signals like QRM, QRN, and QSL, alongside the Amateur's Code, which stresses considerate, loyal, progressive, friendly, balanced, and patriotic conduct.

This map shows real-time radio propagation from stations operating on 11 bands between 1.8 and 54 MHz in the amateur radio service. The display shows world-wide activity from the last 15 minutes and is automatically updated about every minute. Data for the map is gathered from several online sources: WSPRnet, Reverse Beacon Network (CW, FT4, FT8), PskReporter, and DX Cluster.

Over 15 years of operational notes are documented on the AA6E Station Log, covering diverse amateur radio topics. The blog presents detailed accounts of station setup, antenna experiments, and digital mode operations, often featuring specific equipment like the _Ten-Tec Orion_ transceiver. It includes practical discussions on **station grounding techniques** and insights into PSK31 Morse code communication. The resource provides a chronological record of Martin Ewing's amateur radio activities, offering firsthand perspectives on equipment performance and operational challenges. Content often includes technical observations and solutions developed through practical experience, such as optimizing antenna systems for various bands. Specific entries detail contest participation and DX chasing, providing context for operational decisions and results.

Demonstrates the _RoMac Automatic CW Identifier 2012_ software, a Windows application designed to automate station identification and provide a tuning pulser. It can send CW identification via a sound card's audio output or by keying a radio's manual CW jack using a serial port's DTR line. The software also supports CAT commands for various Kenwood, Yaesu, Flex, and Elecraft radios, enabling automatic mode and frequency changes for ID transmission. It integrates with USB audio-capable radios like the Icom 7300 and Yaesu FT-991, simplifying connectivity with a single USB cable. The application features a fully programmable interface, adjustable CW speed from **5 to 35 WPM**, and ID intervals from **5 to 30 minutes**. The integrated "Pulse Tuner" function allows for safe amplifier and antenna tuner adjustments by sending short audio tones or rapid CW keying, with an adjustable duty cycle from 1% to 100%. It offers compatibility with a wide range of transceivers and amplifiers, and a schematic for a basic sound card interface is included for users without existing setups.

137 kHz propagation analysis details ground wave and sky wave mechanisms, drawing heavily from **CCIR Rec. 368-6** for ground wave field strength predictions and **CCIR Rep. 265-7** for sky wave modeling. The resource presents field strength values for 1 W ERP at varying distances, considering ground conductivity and permittivity for ground wave, and ionospheric height (70km daytime, 90km nighttime) for sky wave. Key factors like ionospheric focusing (factor "D"), reflection coefficient ("RC"), and antenna ground pattern factors ("Ft", "Fr") are quantified for 137 kHz, enabling calculation of sky wave field strength. Practical coverage ranges are derived for 137 kHz, showing useful ground wave coverage up to 1600 km over seawater and 1100 km over average ground, assuming a -9 dBuV/m noise floor. Sky wave coverage extends beyond 2200 km during night-time and winter daytime, but is negligible during summer daytime at solar minimum. The document also compares ground wave and sky wave strengths, identifying crossover distances at 550 km (night-time), 750 km (winter daytime), and 1250 km (summer daytime), where interference fading can occur. Adjustments for solar maximum conditions are provided, indicating 2-11 dB higher sky wave values depending on distance and season.

The Orion II A9 Power Distribution Board Problem and Fix by N6IE

A forum post at WZ5Q with modifications of Kenwood TS-2000 audio fratures

1998 Maldived DXPedition by IK5MDF log search and stats

The mid florida dx association was formed in february 2005. to promote friendship and cooperation among amateur radio (wireless) operators primarily

LEMO, established in 1946, specializes in high-performance interconnect solutions, offering an extensive range of over 50,000 circular connectors. Their product line includes the REDEL SP IP68 series, which features resin-free IP68 sealing for robust performance without complex potting processes. These connectors are critical for applications in medical, military, test and measurement, security, defense, and industrial sectors, ensuring reliable signal integrity in harsh conditions. The company designs, tests, and manufactures high-quality cable solutions, providing complete connectivity services such as custom cable assembly and signal integrity analysis. LEMO's solutions are integral to advanced scientific endeavors, as demonstrated by their use in CERN’s NA62 experiment for instrumentation and maintenance. LEMO's 80-year history, detailed in their anniversary publication, highlights their evolution from a Swiss family workshop to a global leader in connector technology. Their product finder tool assists customers in selecting appropriate connectors from their broad portfolio, which also serves audio-video, transportation, aerospace, and UAV applications.

Influence of the ionosphere on the EME signals by EAVQ

The station can be configured for either SO2R (single operator-two radios), M/S (multiple operators single radio), or M2 (multiple operators two radio) contest classifications.

An amateur radio organization dedicated to furthering the amateur radio hobby. It consists of members from Oakland, Alameda, Piedmont and other cities in the immediate area.

Exploring these mysterious transmissions and how their strong following has created a niche in the community. Free article in PDF Format from QST November 2019

Here you will be able to access all of the information regarding our amateur radio disaster relief communications organization, its divisions and volunteer members

RF Solutions is your authorised distributor of superior amateur radio products in Australia, New Zealand, and the Asia Pacific region

Amateur radio operators seeking local community and emergency communications involvement often look for active clubs. The Rock River Radio Club (RRRC) provides a platform for hams in Wisconsin to participate in weekly nets and monthly meetings, fostering camaraderie and operational readiness. Their activities include regular ARES/RACES nets, which are crucial for maintaining proficiency in emergency communication protocols and equipment. The club hosts weekly nets on both VHF/UHF and HF bands, allowing members to practice various modes and frequencies. These include a Monday evening net on the Juneau Repeater at _146.64 MHz_ (PL 123.0) and a Thursday evening net on the Knowles Repeater at _442.975 MHz_ (PL 123.0). An HF net operates on Saturdays at **3.947 MHz**, with an additional ARES/RACES net on Sundays at **3.967 MHz**. Monthly club meetings are held on the first Tuesday of each month at 7 PM in Randolph, Wisconsin, providing a consistent gathering point for members and prospective hams. The club also engages in public demonstrations, such as those at the Experimental Aircraft Association (EAA) Dodge County Chapter Fly-In, showcasing amateur radio to a broader audience.

A interesting guide to help get started with HF published at Essex Ham

The Central Arizona DX Association is an ARRL-affiliated club.

Materials, installation, inspections and certification

The loma pioneer repeater club - lprc provides 2 meter vhf and 440 uhf amateur radio and emergency communication for the san francisco and monterey bay areas from a repeater on mt loma prieta. aprs digipeater available.

A DX and Contest Minded Amateur Radio Club Serving the California Coast North of the Golden Gate Bridge

Dxpedition information site has dates, frequencies, operators etc. Planning a searchable data base for logs.

How to reduce and eliminate the RF interference at VHF caused by the wired network

This is multi multi radio amateur contest station oh2u which have won three european champions

The RSGB Band Plan is normally published annually in the February edition of RadCom and additionally reviewed mid-year. It is derived from the IARU Region 1 Band Plan taking into account any proposed national variations or special amendments, which are considered necessary by the relevant spectrum manager.

Experimental Longwave Transmissions from Tower Hill wayland Massachusetts Operator Name Warren, Ham Call K2ORS, Frequency: 137.7796 KHz

WA1ION article on beverage and ewe antennas

A selection of speakers or headphones for use with amateur radio equipment. Includes an interesting paragraph comparing Dynamic and Electret Condenser Microphones, but also about audio Equalization.

Solar activity can aid or hamper HF propagation beyond line-of-sight range, WA1SVF and N6BV answers to questions about Sun influence on radio signals propagation

Indiana's Premier Repeater Group An ARRL affiliated organization

Building the UHF Cheap Yagi for Satellite Communication

IK2PII describe here a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs.

Yaesu FTDX10 vs. ICOM IC-7300 Comparison Chart and review of reception performances

Also known as 4L9VB DN1MQP DL0TU DB0JT/B DQ2006C

Youtube video by PR7VX using AMTOR to test performance

The official OT2L contest site, with station and operator info and daily updates! check it out...

Fall River Amateur Radio Club

Design a 50MHz long-yagi antenna by PA3FGA

Construction of OZ2M 70 MHz transverter

The South Mountain Repeater Association (SMRA) is a 501(c)(3) non-profit group of amateur radio operators dedicated to community service and emergency communications within Cumberland County and the surrounding area in Central Pennsylvania.

Radio Free Europe/Radio Liberty website provides news and information on various topics beyond borders. It includes top stories, visuals, newsletters, and in-depth coverage. The content is useful for staying updated on global events and perspectives.

FTDX 5000 product page with related accessories

A non-profit organization seeking to preserve the history of the development of wireless communication by encouraging the acquisition, restoration, preservation and exhibition of antique wireless and radio apparatus

A website for those who also enjoy Morse code telegraphy and the keys that make it.

Ten-Tec Orion II picture and specifications at RigPix