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Query: Operating
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Categories
- Operating Modes > Morse code > Morse operating guides
- Operating Aids
- Operating Modes
- DX Resources > DX Peditions > 2025 DXpeditions
- Operating Modes > 50 MHz
- Radio Equipment > HF Amplifiers > Acom 1010
- Radio Equipment > HF Amplifiers > Alpha 87A
- Operating Modes > Satellites > AO-51
- Software > APRS
- Technical Reference > ATV
- Operating Aids > Awards
- Software > Awards tracking
- Operating Aids > Beginner's Guides
- Operating Modes > Mobile > Bicycle
- Operating Modes > Chip64
- Software > Collections
- Operating Modes > Satellites > CubeSats
- Operating Modes > Digital ATV
- Operating Modes > Digital Modes
- Software > Macintosh > DX Cluster Clients
- Operating Modes > EME
- Internet and Radio > Forums
- Operating Modes > FT8
- Ham Radio
- DX Resources > Ham Radio Awards
- Operating Modes > HF Operations
- Operating Aids > History
- Radio Equipment > VHF-UHF Mobile > ICOM IC-2720H
- Ham Radio > Clubs > Europe > Italy
- Shopping and Services > Regional > Japan
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Accessible Equipment Manuals, Useful Operating Tips and Techniques and Contesting for the Blind by NU7I
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Presents the official results for the _CQ World Wide 160-Meter Contest_, a premier event for Top Band enthusiasts. The resource details final scores for both CW and SSB segments, offering links to comprehensive articles, plaque winner lists, and club score breakdowns. It also includes access to score databases for individual modes and years, along with "Soapbox/QRM Comments" from participants, providing insights into operating conditions and experiences. This archive spans results from 2010 through 2025, with a forward-looking note regarding the 2026 SSB contest date adjustment due to a conflict with the _ARRL DX CW Contest_. The site provides specific links for each year, allowing operators to review detailed outcomes, including top scores, errata, and all-time records, such as the _SX5R_ 2017 SSB performance. The structured presentation facilitates easy navigation through historical contest data.
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Over 150 pages of content are dedicated to maximizing activity on the 6-meter band, often referred to as the _Magic Band_. The resource details various propagation modes, including sporadic E, F2, and tropospheric ducting, providing insights into their characteristics and how to leverage them for DX contacts. It also covers essential equipment considerations, from transceivers and transverters to specific antenna designs optimized for 50 MHz operation, such as Yagis and Moxon antennas. The eBook presents strategies for participating in 6-meter contests and pursuing awards like _VUCC_, offering practical advice on logging software and operating techniques. It includes discussions on software tools useful for predicting propagation and managing contacts, alongside guidance on finding and utilizing DX maps to identify openings. The author, K5ND, shares his extensive experience to help operators achieve successful 6-meter DXing. Specific sections address the code of practice for 50 MHz operations and provide assistance in locating rare DX opportunities. The content is structured to guide both new and experienced operators through the nuances of the band, from initial setup to advanced operating strategies.
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Chronicles the operational history of Cullercoats Radio, established in 1906 under _Marconi_ license, detailing its initial use of a spark-gap transmitter feeding a **200-foot** wooden mast. Documents the station's transition in 1915 to Marconi Wireless and a 1929 upgrade to a valve-type transmitter. Explains its later role as a British Telecom (BT) Maritime Radio Station, callsign GCC, serving as a receiving site with transmitting aerials at Hartley. Highlights the demolition of the commercial mast in 2000 and the site's subsequent sale. Features the Tynemouth Radio Club (GX0NWM) operating special event stations like GB4MPC for International Marconi Day from Marconi Point. Includes a historical QSL card confirming a QSO on **7.016 MHz** in 1936.
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Low-frequency (LF) radio time signals, operating primarily in the 40–80 kHz range, are broadcast by national physics laboratories for precise clock synchronization. Transmitters like **JJY** (40 kHz, 50 kW; 60 kHz, 50 kW), RTZ (50 kHz, 10 kW ERP), MSF (60 kHz, 15 kW ERP), WWVB (60 kHz, 50 kW ERP), RBU (66.66 kHz, 10 kW), and DCF77 (77.5 kHz, 50 kW) cover vast geographic areas, often several hundred to thousands of kilometers. LF signals offer distinct propagation advantages over higher-band transmissions such as GPS. Their long wavelengths (3–6 km) enable effective diffraction around obstacles like mountains and buildings. The ionosphere and ground act as a waveguide, eliminating the need for line-of-sight and allowing a single powerful station to cover extensive regions. Ground wave propagation minimizes ionospheric variability effects on transmission delay, and signals penetrate most building walls effectively. Robust and low-cost receivers, often priced at 20–30 USD/EUR, are widely used in radio clocks. These receivers typically comprise a tuned ferrite core antenna, a receiver IC (e.g., Atmel T4227, U4223B, MAS1016) for amplification and AM detection, and a microcontroller for decoding the time signal and phase-locking a local clock. Specific components for DCF77, MSF, and WWVB are readily available from vendors like HKW Elektronik and Ultralink.
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The Michigan Radio Amateur Youth Network (MRAYN) aims to centralize resources for young operators across Michigan, fostering engagement in amateur radio. This initiative brings together various youth-related clubs and activities, providing a dedicated platform for information exchange and participation. The network supports educational efforts and promotes the hobby among younger generations, ensuring continuity and growth within the amateur radio community. Corey Bulock, KD8BOQ, is listed as a key contact for MRAYN, indicating active leadership in coordinating these youth-centric endeavors. The network's focus includes organizing events and sharing relevant content to keep young hams informed and active. By consolidating information, MRAYN simplifies access to opportunities for youth interested in two-way radio communication, from basic licensing to advanced operating techniques.
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This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
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The PG7V Contest Calendar provides a curated listing of significant **HF contests**, with a particular focus on events relevant to European amateur radio operators. It details contest specifics such as start and end times in UTC, eligible bands (e.g., 80 meters, 40 meters, 10 meters), and required exchange information (e.g., serial number, CQ-zone, DOK, locator, age). The calendar includes diverse modes like CW, SSB, PSK63, RTTY, and FT4, catering to various operating preferences. Featured contests include the RSGB 80m Club Championship, WW WPX Contest, IARU Region 1 Fieldday, and ARRL International Digital Contest. Each entry links directly to the official contest rules for detailed information. The calendar also notes specific participation rules, such as the 1 KHz QSY requirement in the HA3NS Memorial Contest or the 24-hour single-operator time limit in the ARRL International Digital Contest. This resource is updated regularly, ensuring timely information for upcoming **contest operations** over a four-week period. It serves as a practical tool for hams planning their contest activity.
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Article on operating aids and band usage during solar minimun periods. Author tries to explain what can we expect on the HF bands during a solar minimum period and which approach to be used to understand band openings.
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Operating an amateur radio club, VE2CEV details its activities, including regular meetings and a significant project involving the construction of a **satellite ground station**. The resource outlines the project's inception, team formation, equipment acquisition, and the physical installation of antennas and rotator systems. It specifically mentions the use of a dual-axis AZ/EL rotator and antennas for VHF, UHF, and SHF (2 meters, 70 centimeters, and 13 centimeters), along with the strategic use of **Heliax cables** to minimize RF signal loss. The club also provides information on its interconnected repeater network covering southwestern Montérégie. The content highlights the practical application of the satellite station for communicating via amateur satellites and the International Space Station (ISS). It details the collaborative effort of members in securing a powerful Linux server, negotiating antenna installation with local authorities, and the precise alignment of antennas. The club emphasizes its role in guiding new amateurs, offering demonstrations, and potentially organizing courses, indicating a focus on community engagement and technical education within the amateur radio hobby.
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Stuff about amateur (ham) radio, especially VHF/UHF, QRP, portable and mountaintop operating
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VP2ERM will be operating from the Caribbean island of Anguilla between July 19 - August 3, 2014
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What is a repeater? How do you use repeaters. A great guide to use amateur radio repeaters incuding repeater frequencies, operating procedures and practices.
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The Buddistick antenna, as demonstrated by KP4MD, effectively handles up to **250 watts** and provides coverage from 40 through 10 meters, with an optional coil extending operation to 80 and 60 meters. KP4MD's video presentation meticulously describes the antenna setup, emphasizing the critical role of the _shunting coil_ for achieving resonance on lower bands like 40 and 80 meters. This practical approach highlights how a compact antenna can deliver solid performance from a constrained location. SWR curve diagrams are included, clearly illustrating the impact of the shunting coil on the antenna's resonating frequency. These visual aids provide concrete evidence of the adjustments needed for optimal operation across different bands, particularly when space is at a premium. KP4MD's insights are particularly valuable for hams operating from apartments or other limited spaces, showcasing real-world results from a balcony installation.
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The G5O Contest Group blog documents contest operations and related activities of the Stockport Radio Society. It covers various **HF** and **VHF** contests, providing insights into station setup, antenna configurations, and operational strategies employed during events. The content frequently includes post-contest analyses, discussing scores, propagation conditions, and technical challenges encountered. The blog entries detail specific contest participations, often featuring photographs of the operating environment and equipment used. It serves as a chronicle of the group's contesting history, offering practical examples of multi-operator station management and logistical planning for competitive amateur radio events. The group's focus on both local and international contests is evident through the range of events covered. Regular updates provide a continuous record of the group's engagement in the amateur radio contesting community.
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The **Luis Trenker Award** is an amateur radio operating award established by the Amateur Radio Club Ladinia to honor the director and author Luis Trenker from Val Gardena, South Tyrol, Italy. To qualify for the award, HF stations must achieve five confirmed QSOs with each of five specific Alpine countries: Italy (with specific prefixes like I1, IK1, I2, I3, IN3, IW3, IV3), France, Germany (with DOKs A, C, T, U), Switzerland or Liechtenstein, and Austria (with prefixes OE2, OE3, OE6, OE7, OE8, OE9). A single QSO with a member of the Amateur Radio Club Ladinia can substitute for the five required Italian QSOs, with members' QSL cards bearing a special rubber stamp. VHF/UHF stations have a simpler requirement, needing only one confirmed QSO with each of the five Alpine countries. SWL stations are eligible under the same conditions as transmitting stations. All contacts must be valid after April 12, 1990. Applicants must submit a list of contacts, certified by two OMs or a club, to the Amateur Radio Club Ladinia in Ortisei, South Tyrol, Italy. The award manager is IN3PGS Karlheinz, and the club official is IW3AQL Luca.
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The Pamlico Amateur Radio Club (PARC), founded in 1994 and incorporated as a 501(c)(3) non-profit, provides a community hub for amateur radio operators in the Inner Banks region of North Carolina. Affiliated with the _ARRL_ since 2011, PARC supports local ham radio activities and offers resources for those living or traveling near the Pamlico River. The club maintains an active presence, participating in events like Field Day and offering various operating opportunities. Members engage in diverse aspects of the hobby, from DXing to emergency communications, fostering skill development and camaraderie. The club's focus extends to public service, providing communication support when needed within its operational area. PARC's commitment to the amateur radio community is evident through its long-standing presence and continuous engagement, reflecting over **30 years** of service since its establishment.
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An article by CT1BOH about recording amateur radio contests. Recording contests is a great tool to detect problems and improve operating efficiency
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Demonstrates the practical application of APRS (Automatic Packet Reporting System) through the lens of HB9PVI's activities in Switzerland. It covers the system's core function of reporting geographical positions and telemetry data from various objects, including mobile stations, aircraft, and the ISS, distributed via packet radio and internet gateways. The resource highlights the routing paradigm shift introduced in April 2005, specifically the recommendation to use _WIDE1-1_ instead of RELAY and WIDE for digipeating to reduce duplicate packets. The page presents real-time maps displaying the positions of amateur radio stations in Switzerland and around Bern, updated every few minutes. It details specific callsigns like _HB9BA-2_ (HB9PVI's home QTH), _HB9BA-8_ (a weather station), and _HB9BA-4_ (a WIDE digipeater on Weissenstein mountain), providing context for their roles within the local APRS network. Links to track HB9PVI's mobile operations (_HB9PVI-9_) and handheld devices (_HB9PVI-15_, _HB9PVI-7_) are also provided. Furthermore, the resource curates a list of APRS software options for various operating systems, including _JavAPRS_ for Europe, _UI-view_, and _X-Astir_ for Linux, alongside digipeater/IGATE software like _DiXPRS_. It also offers downloadable APRS information, including a PDF article by HB9PVI and HE9ZGN, and a PowerPoint presentation in German, making it a repository of practical and historical APRS data.
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The Itchen Valley Amateur Radio Club (IVARC) provides a local hub for radio amateurs in the Southampton and Winchester areas of the UK. This club actively participates in various UK contesting events, including the weekly _RSGB VHF UKAC_ contests, _RSGB AFS club contests_, and _BERU contests_, alongside annual UK field days. As a _Brickworks Accredited_ club, IVARC is committed to supporting both new licensees and experienced operators in exploring diverse aspects of the hobby, fostering skill development and operational experience. Meetings are held on the 2nd and 4th Friday of each month at the Bianchi Suite, Otterbourne Village Hall, offering a consistent schedule for members and visitors. The club's recent activities include supporting _Jamboree On The Air_ (JOTA) for local Scout groups (e.g., GB1ESG), activating special event stations like _GB0SR_ from Solent Rescue Lifeboat Station, and organizing club visits to significant historical sites such as Bletchley Park. IVARC also hosts events like QRP Day and National Field Day, providing practical operating opportunities and fostering camaraderie among members.
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The Tennessee Contest Group (a.k.a. TCG) is a group of Amateur Radio operators (hams) who enjoy operating in competitive radio sporting events or contests.
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While there are quite a few standalone Morse Code or CW decoders out there, I wanted to tackle the problem myself and end up with both a great Arduino learning project and a decent portable decoder for when I'm out in the field operating QRP
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Analyzing 433 MHz radio signals from common wireless devices, such as temperature sensors and remote controls, involves understanding **On-Off Keying (OOK)** modulation. This resource details the process of capturing these signals using a Software Defined Radio (SDR) like Gqrx and then visually inspecting the captured audio data in a sound editor such as Audacity. It differentiates between **Pulse Width Modulation (PWM)** and Pulse Position Modulation (PPM) encoding schemes, illustrating how to identify and decode binary data by eye based on pulse and gap durations. The article provides a step-by-step walkthrough for decoding a wireless thermometer's data, correlating bit patterns with known temperature, humidity, and channel values. It also demonstrates decoding an RF remote control's button presses, highlighting the constant and varying parts of the transmitted packets. The content further introduces automated decoding using tools like RTL_433, explaining its capabilities in parsing various device protocols and showing how to interpret its output, including modulation type and decoded data. Specific examples include analyzing Prologue sensor protocol specifications from RTL_433's source code and noting common operating frequencies like 433.92 MHz in Europe and 915 MHz in the US.
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Operating in the Caribbean, the Jamaica Amateur Radio Association (JARA) provides a central hub for amateur radio enthusiasts on the island. The association details its **repeater network**, including IRLP node 7673 and ECHOLINK access, alongside information on band activity and packet radio operations. Members can access specific documents like the JARA Membership Form and the JARA Disaster Plan, while general visitors can review the full JARA Regulations and learn about the club's history. The site features a photo album and outlines various radio activities, including what constitutes a JARA Field Day. It also provides essential resources such as the Reciprocal License Form and Jamaica Amateur Radio Regulations, crucial for visiting operators. The **WINLINK Project** and Radio Voice Procedure are also covered, offering practical guidance for communications. JARA maintains affiliations with international bodies like **IARU Region II**, ARRL, and RSGB, and lists important organizations such as SATERN 14.265, Jamaica Red Cross, and the National Hurricane Center. The website also includes links to other amateur radio clubs across North America, the Caribbean, and Central and South America, fostering regional and international connections.
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JT65 software download archive for all JT65 editions, includes a JT95 and JT9 operating mode informations, JT65 reference website for Japanese operators.
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P4-A narrowband transponder Operating Guidelines and Band Plan, coverage map of the QO100 geostationary amateur radio satellite
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Annual poll for radio amateurs - the good, the bad, the ugly! This is an annual survey conducted among the online community, and it represents the status of amateur radio. The authors ask to hams several questions, from the most used operating modes, to the typical ham radio lifestyle habits.
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Basically, this antenna is a 23-foot wire fed through a 4:1 un-un transformer. This antenna can be easily used in portable operation, for operating all bands from 40-10 meters.
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High Speed Multimedia (HSMM) radio, as introduced by John Champa, K8OCL, represents a significant advancement in amateur radio's digital capabilities, moving beyond traditional keyboard modes like packet radio. This initiative, driven by ARRL's Technology Task Force, focuses on developing high-speed digital radio networks capable of up to 20 megabits per second. HSMM primarily facilitates digital voice (DV) and digital video (ADV), enabling real-time video transmission from emergency scenes to an EOC without expensive ATV gear, often requiring only a laptop, a PCMCIA card, a digital camera, and a small antenna. The working group's initial efforts concentrate on cultivating microwave skills within the amateur community to build and support portable and fixed high-speed radio-based local networking, or **RLANs**. These networks prove invaluable for RACES and ARES organizations, as well as homeland security and other emergency communications. Field Day exercises and simulated emergency tests (SETs) are encouraged to hone skills in rapid site surveys and deploying broadband HSMM microwave radio networks, with examples like linking Field Day logging stations or antenna test results at the Midwest VHF-UHF Society Picnic 2003. Getting started with HSMM often involves adapting off-the-shelf **IEEE 802.11** (WiFi) equipment to comply with amateur radio regulations, typically operating in the 2.4 GHz ISM bands. While consumer WiFi gear has range limitations under Part 15 rules, proper setup under amateur regulations can extend coverage significantly, with test networks like the Hinternet achieving 5-15 mile ranges at 54 M bit/s using small mast-mounted dish antennas. Careful selection of equipment with external antenna ports, high transmit power, and low receive sensitivity is crucial, along with using low-loss coaxial cable like LMR-400 for optimal performance at these frequencies.
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The NERG is an amateur radio club operating in the North East Suburbs of Melbourne, in Victoria, Australia.
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Presents amateur radio activities and experiences from JJ0LUU and JJ0LXF, two operators based in Japan. The weblog, hosted on shinshu.fm, documents their on-air operations, equipment setups, and general ham radio interests. Content often includes details about specific contacts, antenna configurations, and local operating conditions within the Japanese amateur radio community. The resource primarily focuses on personal operating logs and occasional technical discussions relevant to their station. It offers a glimpse into the daily life and pursuits of Japanese **amateur radio** operators, detailing their engagement with various bands and modes. JJ0LUU and JJ0LXF share their passion for radio communication, contributing to the broader online repository of individual ham radio narratives. The site serves as a digital logbook and informal platform for sharing their **DXing** and contesting endeavors.
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Operating in a Single Operator Two Radios (SO2R) setup, especially with beverage antennas, often exposes the receiving radio's front-end to significant RF energy from the transmitting radio. This resource details a practical, homebrew receiver protection circuit designed to mitigate this risk. The core of the design involves a non-inductive 2W 22 Ohm carbon composition resistor in series with the RX antenna line, followed by two stacks of four fast-switching diodes (e.g., _1N914_) configured in opposite polarizations. This arrangement effectively clamps the incoming voltage to approximately 2.8 V peak-to-peak, safeguarding sensitive receiver input components. The series resistor plays a crucial role by absorbing excess power, preventing the diodes from exceeding their current ratings and potentially failing open, which would leave the receiver unprotected. The author, _N4KG_, measured up to 50 watts of coupled power between 80M slopers on the same tower, highlighting the necessity of such protection. The design is presented as a cost-effective solution to prevent damage to receiver input transformers, with the author noting successful protection of a receiver even after a resistor showed signs of overheating. This simple circuit can be integrated via a transverter plug, offering a robust defense against high RF input.
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The Advanced ATV Repeater is probably the most versatile ATV repeater controller in The World. It can run entirely under the operating system or all repeater functions can be controlled from any other computer
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Mini-Operating Guide includes useful hints on Using the HM-133 Microphone, Basic Operation, Operating through a Repeater, Programming a Memory Channel and Assigning a Memory Channel to a Memory Bank
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Introduction to operating on microwave bands at VKFAQ
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Documents S21RC's construction of an impedance transformer harness for a VHF/UHF cross yagi, utilizing 20m of _RG179_ cable. Details the creation of a DIY RF sampler with a -50dB sampling output, primarily for measuring HF radio PA section output with a Spectrum Analyzer, also applicable for _Pure Signal_ transmission. Chronicles the deployment of a 200m long beverage antenna for the _S21DX IOTA_ operation in 2022, positioned 2m above ground. Discusses the construction of a 3-element short beam for 10m to replace a previous 2-element antenna, with assistance from S21DW. Provides guidance on operating cheap _PA-70_ and _PA-100_ type Chinese SSPAs using IRF530 MOSFETs, emphasizing the necessity of a final LPF. Outlines the design and construction of a fully isolated interface for radio-to-computer connections, supporting various digital modes with isolated ground, audio transformers for IN/OUT, optical isolation for CAT/CIV, and isolated PTT/COS lines. Includes a log of software updates, such as the _HMI/TFT for NX8048K070_ and _2.1.14 Lite_ release with bug fixes for PEP hold and gradual watt decay.
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Operating ham radio in international waters
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Highlights the VE2CWQ amateur radio club, a key player in Quebec's emergency communication network and a member of the _RAQI_ federation. The club actively supports the _CANWARN_ program, providing crucial communication links during outages or natural disasters when traditional telecommunication infrastructure fails. Members are encouraged to monitor specific frequencies for vital updates and instructions during emergencies. The club maintains a repeater, VE2RAW, operating on **449.325 MHz** from Mont-Rougemont, ensuring reliable local coverage for its operations. VE2CWQ emphasizes the significant public service role of amateur radio beyond hobby, contributing to community safety and resilience.
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Details the history and cessation of the Amateur Radio Association of Bahrain (ARAB), operating under the callsign **A92C**. Established in 1970, ARAB functioned as the primary representative body for amateur radio enthusiasts within Bahrain for several decades. The organization facilitated various amateur radio activities and provided a central point of contact for local hams. The resource indicates that ARAB ceased operations due to unspecified circumstances. It explicitly states that the organization is no longer active, marking the end of its long-standing service to the Bahraini amateur radio community. Information regarding a newly formed society, open for membership, is provided, with contact details for Fawaz, **A92AA**, for further inquiries about the successor organization.
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When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters
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VK9GMW will be operating from Mellish Reef between March 22 and April 6, 2009.
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Provides a robust logging solution for amateur radio operators across multiple operating systems, QLog simplifies the process of recording contacts and managing station data. It leverages the _Qt framework_ for its graphical user interface and stores all QSO information efficiently in a local SQLite database, ensuring data integrity and accessibility. This design choice supports a streamlined user experience for daily logging activities. QLog supports essential logbook functionalities, enabling hams to accurately document their two-way radio contacts. While not specifically designed for high-speed contest operation, it serves as a reliable tool for general amateur radio logging, allowing operators to maintain detailed records of their on-air achievements and station activities. Its cross-platform compatibility, including Linux, Windows, and macOS, makes it a versatile option for a wide range of amateur radio enthusiasts seeking a free and functional logging application. The project is a fork from _7h0ma5/QLog_, indicating a continued development path.
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Single operator two radios (SO2R) operating practice at wikipedia
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Amateur radio repeaters, often designated by an "R" number like _R6_ or _R5_, serve as crucial infrastructure for extending VHF/UHF communications range. This resource from Essex Ham explains the fundamental concept of a repeater, detailing how it receives on one frequency and simultaneously retransmits on another, typically with a 600 kHz offset for 2-meter repeaters. Understanding the input and output frequencies, along with the required CTCSS tone, is essential for successful access, ensuring your signal is processed and relayed across a wider service area. The article clarifies the importance of using the correct _CTCSS_ (Continuous Tone-Coded Squelch System) tone, often referred to as a sub-audible tone, to activate a specific repeater. It also touches upon the concept of _simplex_ operation versus repeater use, highlighting the benefits of repeaters for mobile and handheld transceivers. Proper operating procedures, such as listening before transmitting and keeping transmissions concise, are emphasized to maintain good amateur practice on shared repeater assets.
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A tutorial on how to get started operating RTTY using MMTTY as the primary program to begin your RTTY operations. Installing, configuring and using MMTTY. Documentation in English and Spanish
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Determining the characteristic impedance (Z) of an unknown coaxial cable, a common challenge for many radio amateurs, can be resolved with a straightforward method. The impedance of a coaxial cable is derived from its inductance and capacitance, and importantly, these values are independent of the cable's length or the operating frequency. This means that measuring a random length of cable, such as 20 meters, provides sufficient data for calculation. The core of this technique involves an LC-meter to obtain the inductance (L) in microHenries (uH) and capacitance (C) in microFarads (uF). The impedance is then calculated using the formula Z = L/C. For instance, a measurement yielding L=1.2uH and C=450pF (0.00045 uF) results in an impedance of 51.6 Ohms, closely matching **RG-58** specifications. Similarly, a TV coaxial cable with L=1.8uH and C=320pF (0.00032 uF) calculates to 75 Ohms. While the accuracy of this method, depending on the LC-meter's tolerance, is approximately 10%, it proves sufficiently precise for practical determination of unknown coaxial cable impedance, as noted by Makis, SV1BSX, who credits Cliff, K7RR, for the formula's dissemination.
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Operating on Airplane scattering. Scattering of radio signals by airplanes. An introduction to operating ariplane scattering, using aircraft to redirect RF that would otherwise be lost in space. Antenna Pointing, Doppler Shift/Digital Modes, using digital modes to operate airscatter.
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Getting Started on the Magic Band is a very exaustive article about operating the six meters band. It covers several aspects of operations, techniques, tips and guidelines on getting started on the six meters band.
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Free to download PDF book about operating The VHF/UHF bands written in the early to mid-1990s by a team of experienced VHF/UHF DXers and equipment developers, in an effort to pass on their knowledge and stimulate further developments.