Search results

A little information about my equipment, qsl cards etc.

Multi band Moxon Yagi Antenna for 10,15,20 meters band with just one feed line. Drawing and project with dimensions

Mark Connelly, WA1ION article on Medium Frequency Amplifier Circuits in PDF format, include some RF amplifier schematics

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

All about stacking and matching yagi antennas.

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

A transceiver front-end protector in high signal level environments. An homemade RF limiter to protect your receiver front-end from high radio frequency.

Live audio of the National Hurricane Center’s Skywarn Nets. This live feed covers several different states, and locations throughout the US including: TX, LA, MS, AL, FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, VT, and ME

Review of Logikey K-5 Keyer

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.

A complete guide to undestand and know how electret condensor microphone elements works by K3DAV

Microhams is a dynamic organization of hams in the Puget Sound area. The club includes a broad range of people from our local tech industry who participate in just about every aspect of our hobby.

Analysis of N3UJJ installed antennas using the AIM4170b Antenna Analyzer

QRP Popular Frequencies, where to operate in QRP mode

Distributor of ESD, kapton tapes, high temperature tapes, esd wrist straps, ionizers, ground cords, grounding devices, ESD gloves, esd finger cots, esd workstations, esd rubber bands, esd binders, esd bags, anti static glove, esd rubber bands, no clean solder paste, water soluble solder paste, finger cots, esd mats

Homepage Of The Big Time Operators CB Club Based In Muncie Indiana USA

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

Six elements yagi antenna for 6 meters band. This antenna design is based on the QuickYagi 4 software by WA7RAI, uses a 6.5 m boom, feature 12.0 dBi gain and 35dB front/back

Radials & Counterpoise

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

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

Autocode makes a selection of fine morse code identifiers for commercial and amateur radio applications.

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.

A freeware windows antenna design and modelling software developed by an amateur radio operators primarily intended for VHF yagi aerials.

On this page are designs for Dual Band 2M / 70cm antennas. All antennas are 50 ohm designed driver. These Yagis have a unique element called a Open Sleeve. 4 Element 5 element and 9 element Dual Band - 2M / 70cm antenna projects

Ham Radio cartoons of common situations

A multiband trapped end-fed antenna can cover 20 30 40m bands. An option for portable sota operations were weight end simplicity are essential

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

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.

Study of the Coaxial Dipole: Just how does this thing work.

ScopeIIR: an Infinite Impulse Response (IIR) digital filter design tool for Windows. It designs high-order IIR filters based on analog filter prototypes, and can design lowpass, highpass, bandpass, and bandstop filters.

Page dedicated to the Yaesu FT-920

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

ABR Industries specializes in providing high-quality coaxial cable and related components for the amateur radio community and beyond. Their product line includes various types of _coaxial cable_, such as LMR-400 equivalent and RG-8X, designed to minimize signal loss and ensure efficient power transfer. The company also offers custom cable assemblies, allowing operators to specify exact lengths and connector types for their unique shack configurations or field deployments. Beyond bulk cable and assemblies, ABR Industries supplies a range of RF connectors, including PL-259, N-type, and BNC, compatible with their cable offerings. Their manufacturing process emphasizes durability and performance, crucial for reliable operation in diverse environments, from fixed station installations to portable operations. The company's focus on quality control ensures that products meet specifications for impedance matching and shielding effectiveness, which are vital for achieving optimal signal integrity and reducing interference in radio systems.

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

QRQ or Copying CW over 70 wpm

An illustrade article that try to explain with simple concepts how and why rhombic antenna work.

Installing a ham radio transceiver into a moder vehicle and aspects you may consider.

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.

Speaker repair, reconing, re-edging, speaker parts, DIY re-edge kits.

Discussion at towertalk about coax cable feed lines vs Open Wire Lines

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

Introduction to the use of clusters and Packet Radio, hardware, settings and commands by ON4SKY

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.

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

Based in Virginia USA, offer repearing services for amateur radio equipment and related accessories

ALFA SIERRA Serbia division homepage

PDF File of the IC R7100 communication receiver service manual