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The range and coverage of your VHF transceiver will be limited to your radio horizon. How to calculate the visual horizon and how to determine the Radio Horizon

Analysis of N3UJJ installed antennas using the AIM4170b Antenna Analyzer

A 220-ft tower that has five catenary lines, each about 500 feet long. Four of these lines, running NE, SE, SW, and NW support four 1/4-wavelength wire verticals used in a 160-meter four-square antenna.

VK9MT Online Log Search - Mellish Reef 2014

From 1973 we work in the communication system on HF, VHF, UHF, SHF for P.M.R., OM and broadcasting.

On line shop in Greece for amateur radio products, electronics, DAB Radio and GPS. Dealer for popular amateur radio brands, heil sound, kenwood, MFJ and more

PDF File of the IC R7100 communication receiver service manual

Demonstrates a range of specialized radio frequency equipment and consulting services for amateur and professional applications. The offerings include _Vector-Finder_ direction finding antennas, various test equipment such as _gate dip meters_ and RF sniffers, and communications receiving adjuncts. Additionally, the company produces satellite antennas for weather satellite reception, voice amplification devices like the _Flex-Mike_, and custom prototype circuit boards. The company's product line addresses needs for precise RF measurement, signal detection, and specialized antenna systems, particularly for direction finding and satellite communications. Their historical association with National Radio (HRO) suggests a legacy in radio technology. The site also highlights a subsidiary, Sierra Mountain Products, which offers outdoor recreational gear, indicating a diversification beyond core RF manufacturing.

QRP Popular Frequencies, where to operate in QRP mode

Effectively teaching amateur radio licensing classes requires more than just technical knowledge; it demands strong pedagogical skills and organizational acumen. This guide addresses the practical aspects of conducting successful amateur radio courses, emphasizing the instructor's role as an educational manager rather than merely a knowledge dispenser. It explores various class organizational structures, including traditional weekly sessions and _hybrid_ full-day formats, noting that many small meetings are often preferable for student engagement. The resource also provides strategies for finding suitable class locations, from public libraries and community centers to navigating public and private school systems, highlighting the importance of stressing the public service aspect of amateur radio to potential hosts. Key sections delve into effective classroom management, stressing the importance of preparation, a structured routine, and creating a comfortable learning environment. It details the VARK learning styles (Visual, Aural, Read/write, Kinesthetic), advocating for teaching methods that engage multiple senses to enhance student comprehension. The guide also offers advice on breaking down complex technical material, defining unfamiliar vocabulary, and making theoretical concepts practical through real-world examples. It includes a sample entry-level license syllabus covering topics like the nature of amateur radio, technical basics, transmitter/receiver fundamentals, and antennas, providing a framework for instructors to build their curriculum.

WA3KEY Virtual Collins Radio Museum. A complete resource for Collins Radio users, collectors and restorers.

Vintage radio equipment and memorabilia 1910 - 1950

100 W output RF amplifier for 10 meter band project by W4NFR

Valcom Guelph specializes in the design and manufacturing of a full range of MF Beacon 100 KHz - 600 KHz, AM Broadcasting 540 - 1700 KHz, HF 1.8 - 30 MHz, VHF 30 - 300 MHz and UHF 300 - 1,200 MHz and SHF up to 6 GHz antennas based in Canada

A little information about my equipment, qsl cards etc.

A vertical antenna project for the 7MHz made with some spare parts. Based on a broken 20 foot fishing pole, it is based on a good ground system made with radials and a capacitive hat done to increase the global radiation resistance of the antenna. A custom loading coil is also included in this project to perfectly tune the antenna to the CW portion of the 40 meters band.

The CWJF CW Club website is a resource for Morse code radio enthusiasts in Juiz de Fora, Brazil. It provides information about the club, its activities, and contact details for those interested in joining. The site also includes news updates and event announcements for members and visitors.

Receive and listen to FM and AM radio broadcasts on your browser or ChromeBook using an RTL2832U-based USB digital TV tuner.

Radials & Counterpoise

Used in the Kenwood TM-241, TM-741 2m module by W3KKC

ScanBC is British Columbia's online radio scanning community

List compiled by N4LCD with description of main frequency usage

An home made end fed half wave antenna with a tuner box by NG0R

Lot's of vintage radios from 30's

A Flemish association of shortwave listeners

This group is being formed to support those radio enthusiasts that already have experience in SWL, Scanners, or Citizen Band/FRS radio that would like to know more about becoming a Ham.

Club Russian Robinson for amateurs interested in radio communication from polar stations, islands and maritime mobile objects RRC founded in 1993. Goals are consolidation of radio amateurs, operating now or operated in the past on islands, drift-ice research, arctic and marine stations, signing their personal callsigns or as participants of DX-peditions.

Technical Correspondence, QST, July 1990 - Why even "perfect" phased array element currents don't produce perfect patterns.

Illinois Cook County, police scanner includes Chicago Fire Dispatch channels (North, South, and HazMat)

The .64 wavelength antenna is presented as a single-element design offering superior gain, specifically noted for achieving at least 0.8 dB/d more gain towards the horizon compared to a 5/8 wave element. The discussion emphasizes identifying specific hardware revisions, defining clear operating goals for various signal paths like receiving, transmitting, and data, and establishing a baseline measurement before any modifications. This methodical approach ensures accurate assessment of antenna performance. Practical application involves a structured testing methodology where only one variable is altered at a time to ensure valid comparisons. The article suggests exploring related technical paths, referencing components like the R820T Rafael Micro and Mirics MSI3101 SDR USB Dongle, and encourages a holistic view of the radio system from antenna to operator. This systematic process helps hams optimize their antenna systems for improved DXing and contesting.

This Radio Direction Finder Device Connects to an FM Receiver, Transceiver, or HT

This is a presentation used at OVARC on the LindenBlad antenna construction. The presentation cover several topics about this antenna, from the basic antenna design, to the guide on how to contruct a custom lindenblad antenna for the 2 meters band and and 70 centimenters band.

Sizes of wire as compared to their gauge American Wire Gauge by W8HDU

Ham Radio cartoons of common situations

With spectrum analysis of beacon signals, it's possible to see features relating to various propagation phenomonen.

QRQ or Copying CW over 70 wpm

Comparison of FT-1000D FT-736R FT-817 FT-847 FT-897 IC-765 Orion TS-2000 Spectral purity of a continous carrier, of a SSB and CW signals

Homebrewing a Gamma Match to tune yagi antennas

Amateur Radio dealer based in Japan

Products and books for the radio hobbist. Antennas, Coax cables, filters,Lightning Protection, Wire & Cable, Books

"Sked Wizard is an applet designed to help radio enthusiast get more enjoyment from their available operating time, ships with a list of ""radio related"" world band programs"

Batteries online store

Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.

Broadcasts national and international programs locally and to all world regions in over 30 languages on mediumwave FM, TV, RealAudio/TV and on shortwave.

Practival project that contains two isolation transformers, one for AF from the tranciever to the line in on a soundcard, and one from the audio out of the soundcard back to the mic / data input of the radio. Both of which are variable inside the interface via two preset resistors.

There are a large number of antenna designs for HF. One choice out of many is the fan dipole. The ability to transmit of multiple bands without needing a tuner (and even more with a tuner) is a very desirable factor in choosing a versitle antenna for HF.

This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied.

A selection of radio collectors from all around the world interested in collecting, repairing, restoring, trading, selling parts, radio magazines, advertising collectibles, old records and technical talk.

Super Antenna Systems for HF - VHF - UHF Portable Stealth Mobile Base Backpack EmComm Ham Radio antennas

G0UPL QRSS receiver inspired by I1DFS receiver