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Applied instruments manufactures test and measurement equipment for the broadband telecommunications industry. products include carrier generators, signal level meters, rf switches, spectrum analyzers and a return alignment system.

The Araucaria DX Group, based in Brazil, functions as an amateur radio club specializing in **DXpeditions**, **contesting**, and organizing various related events. The group actively sponsors contests and provides resources for DX enthusiasts. Its primary focus is on facilitating and participating in long-distance radio contacts and competitive operating events, contributing to the global amateur radio community. The group's activities include coordinating expeditions to rare DX entities, participating in major international contests, and fostering skill development among its members. By sponsoring events, the Araucaria DX Group supports the growth of amateur radio in South America, encouraging participation in competitive operating and promoting the pursuit of DX. The group's initiatives aim to enhance operational proficiency and expand the reach of amateur radio communications.

Building a Double Extended Zepp Antenna

Unfilter LF output from the TH215/415 kenwood portable radio

Presents a dedicated logging solution for amateur radio DXpeditions, addressing the unique operational demands of remote or temporary stations. This freeware Windows application provides essential tools for managing QSO data, ensuring accurate record-keeping during high-volume operations. The software supports efficient entry and retrieval of contact information, crucial for verifying DXCC credit and submitting contest logs. It streamlines the process of logging contacts, which is vital when operating from rare entities or during intense pile-ups, helping operators maintain focus on making contacts rather than complex data management. The application aims to simplify the logistical challenges associated with DXpedition logging.

Search the online log for 9X0T 9X0Y DX Peditions 2018

A mini Dxepidition to Piel Island on 24th/25th of May 2008 by the CQ CQ Portable group and the call sign will be GB0PIA.

Fine tuning your Multiband Hustler Vertical

ANDAMAN ISL. 2006 VU4AN on AS-001, BANABA ISL. 2004 T33C on OC-018, MYANMAR 2003 XY4KQ on AS-167, MYANMAR 2002 + XY0TA on AS-165, CAMBODIA 2001 + XU7ABR on AS-133

A study on 20m antennas by Kenny Silverman, K2KW

The 160-meter amateur radio band, spanning 1.8 to 2 MHz, was historically the lowest frequency amateur allocation until the introduction of the 630-meter and 2200-meter bands. ITU Region 1 allocates 1.81–2 MHz, while other regions use 1.8–2 MHz. This band, often called "Top Band" or "Gentleman's Band," was established by the International Radiotelegraph Conference in Washington, D.C., on October 4, 1927, with an initial allocation of 1.715–2 MHz. Effective operation on 160 meters presents significant challenges due to the large antenna sizes required; a quarter-wavelength monopole is over 130 feet, and horizontal dipoles need similar heights. Propagation is typically local during the day, but long-distance contacts are common at night, especially around sunrise and sunset, and during solar minimums. The band experienced a resurgence after the LORAN-A system was phased out in North America in December 1980, leading to the removal of power restrictions.

This PDF File include the serial commands to program and control the TH-G71. Should work with TH-D7 series too

1998 Maldived DXPedition by IK5MDF log search and stats

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.

TI0RHU Radio Club Heredia Costa Rica with ROMEO HOTEL, DX group.

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

Council Bluffs area Sheriff, Police, Fire, and State Police IOWA

Amateur radio operations during heartquake in italy

Spanish only website with mail list and meteor showers reports.

Have you searched and searched for a good speaker for your ham radio? That perfect speaker that would let you hear voices through the noise and static without hiss?

Review of the popular Heil PR-781 mic, connected to an Icom IC-7800 by k3dav

D-Star article by wikipedia.

DXpedition by Rene/DL2JRM, Bodo/DL3OCH, Dan/DL5SE, Daniel/DL5YWM & Anett/DO6XX

Mobile RFI, often manifesting as persistent noise in the receiver even with the antenna disconnected, frequently originates from the vehicle's power supply system. This guide details systematic troubleshooting steps, beginning with isolating the radio from the car's 12-volt supply to confirm the power system as the noise source. It emphasizes the critical importance of drawing power directly from the battery using **heavy gauge wire**, bypassing the fuse block to leverage the battery's natural capacitance for RFI suppression and ensuring a solid RF ground. Proper routing of power lines through the firewall is also covered, advocating for dedicated grommeted holes to prevent inductive coupling from other wiring harnesses. The article stresses the necessity of fusing both positive and negative leads from the battery, a crucial safety measure to prevent damage to the rig and mitigate high-current risks should the battery's engine block ground become compromised during service. Addressing **alternator whine**, a common high-pitched noise that varies with engine speed, the resource suggests checking battery connections and the alternator-to-battery harness for looseness or corrosion. It also mentions the utility of adding an external RF noise suppression capacitor in parallel with the alternator's internal capacitor for enhanced filtering, and the effectiveness of commercially available in-line power supply filters.

The page provides a detailed guide on how to build your own NOAA weather satellite receiving station, covering hardware, antenna, computer setup, and software installation. It offers a straightforward explanation suitable for beginners and serves as an educational project. The content includes step-by-step instructions and tips for observing satellites in the night sky.

QRSS pictures and examples from IW0HK ex IW1CXZ

Commonly used abbreviations in morse code operations

160 to 40 meters inverted L antennas projects

Transferring Radio Frequency Energy from Your Transmitter to Your Antenna by Don Keith N4KC

Cordell DX peditions association

TACLog offers a distinct approach to contest logging for **VHF/UHF/SHF** operations, diverging from the rigid input formats often found in other logging applications. This software prioritizes operational freedom, allowing contesters to input data in a sequence that suits their workflow during a fast-paced event, rather than being constrained by predefined field orders. It's particularly tailored for those participating in contests governed by **Region 1 rules**, ensuring compliance with established regulations. The program's design focuses on practicality for serious contesters, providing a robust platform for managing contacts. Its support for the EDI format is a significant advantage, streamlining the process of submitting logs to contest committees and facilitating data exchange within the amateur radio community. My experience with various logging tools confirms that flexibility in data entry can dramatically improve efficiency during multi-operator or high-rate single-operator contests, where every second counts.

ST0RY ZK1NDS VP2MGS 9H3AAB C56A C56T

A home made 4 element yagi antenna that can be easily adapted for 10 meter band

Learnings from the 6Y4A CQ WW CW Contest By K2KW and N6BT

XU7AAV, ZD8VJ, ZD7VJ, 3D2VJ, T20VJ, A35VJ, 5W1VJ, AH8F, ZK2VJ, 8Q7VJ, V47VJ, 9G5VJ and more

A J-pole antenna plan for 50 MHz based on the DK7ZB design

Which is better a 20m antenna for an island DXpedition: Yagi at 25', or a vertical or two on the beach?

The Medina County Amateur Radio Corporation (MCARC) is an amateur radio club based in Medina County, Texas, dedicated to promoting the hobby and providing community support. The organization actively participates in events such as **Winter Field Day 2024**, demonstrating operational readiness and emergency communications capabilities. MCARC focuses on fostering camaraderie among local hams and engaging in various on-air activities, contributing to the overall health of the amateur radio community in its region. The club's activities include regular meetings and participation in significant operating events, which serve to enhance members' technical skills and operational proficiency. By organizing and engaging in events like Field Day, MCARC members gain practical experience in setting up and operating portable stations, often under challenging conditions. This hands-on experience is crucial for developing robust **emergency communications** skills, which are vital for supporting local communities during times of need.

About experiments and measurements on loading coils using net standing wave current

Live scanner feeds for the Fire department for various sectors of the San Francisco Bay area.

Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators, read more about contesting at wikipedia

Free windows program that download data from LoTW and modify an ADIF file exported from Logger32. This utility downloads data from LoTW and save data in the correct format required by Logger32. This program can be used instead of original ARRL scraper.exe tool.

XR6M Mocha Island Extreme Bands DXpedition 2003

DXpeditioning since 1993, February/March 2006 - Saint Martin & St. Maarten FS and PJ7, October 2005 - South Africa ZS1/DL7DF, April 2005 - Ghana 9G5SP, Feb/Mar 2005 - British Virgin Islands VP2V/DL7DF, October 2004 - Cameroon TJ3SP, February 2004 - Kenia 5Z4HW , October 2003 - Myanmar XZ7A, March/April 2003 - Tobago 9Y4/DL7DF, Oct/Nov 2002 - Guinea 3XY7C

2012 Ham Radio HK0NA DX Pedition to Malpelo Island, official site with hk0na online log

Documents the OC1I and OC6I IOTA DXpeditions to Peru, specifically highlighting operations from SA-098 (Isla La Leona) and SA-076 (Isla Lobos de Afuera). The OC1I team logged over **8000 QSOs** from SA-076, while OC6I made 1400 QSOs from SA-098, despite challenging propagation conditions. The resource details the equipment used, including an _IC-7000_, an IC-706mkIIG, and a TS-440SAT, along with various antennas such as a 160m dipole, FD4, G5RV, and a multi-band vertical for 17m, 20m, 30m, and 40m. The DXpedition dates are specified: OC6I operated from SA-098 between December 28 and December 30, while OC1I was active from SA-076 from January 2 to January 7. Both operations are confirmed as valid for IOTA credit. The page also includes a video link for the OC6I operation and a photo gallery from the DXpedition. Feedback is welcomed, and the webmaster is identified as Bodo Fritsche, DL3OCH.

Sleeping tecniques during contest operations. This article originally appeared in the National Contest Journal.

About Sporadic E propagation at wikipedia

Wikipedia page on Notch filter, a narrow stopband - high Q factor filter