Search results

Article explaining electronic network of low pass filters

Provides technology and solutions for the electronic test and measurement, optical, rf and microwave, wireless, wired, telecommunications. Make Frequency Counters, Antenna and spectrum analyzers, power meters, signal generators

Online calculator, Butterworth Bandstop (Notch) Filter Designer

PACTOR mode radio modems and accessories, performance sailing electronics and innovative hard to find parts. Audio cables, packet cables, usb to serial converters

Lightning protection for electronic equipment

Radio electronic and antenna consulting, servicing and buildups of customer supplied components. Transmitter and receiver site work and on line help.

About basics of the horn antenna used for many rf microwave antenna applications.

Ham radio shop in Hanstholm Denmark

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

Ham rasio shop in Chzeck republic, offer antennas, filters, roators, electronic components, cw keyers, power supplies, and other ham shack accessories

GCARA is a general interest amateur radio club intended to promote amateur radio, electronics education and fellowship through amateur radio in the Greater Cincinnati Tristate - Indiana, Ohio and Kentucky area. The club service area lies within a circle having a radius of 25 miles from downtown Cincinnati.

This is a group for CBers, Sidebanders, Amateurs and Freebanders. Items to be discussed are CB, Skip, Skeds, DX communications, SSB, export radios, Radio equipment, mods, ham radio, repairs, electronics, CW, PSK31, RTTY, digital, and different radio shops.

Around 200 electronic circuits in pdf format or images, There are also over 1000 links to useful electronics, freeware, open source websites. There are some 100 useful documents, software and pcbs too. Mainly industrial electronics, instrumentation. Covers Various aspects of electronics and basics of circuit design.

Batterytech supplies NiMH, NiCd, and Li-ion battery packs, chargers, and analyzers, catering to a range of portable electronic devices including Ham Radio handheld transceivers. The product line supports popular amateur radio brands such as _Kenwood_, _Icom_, and _Yaesu_, providing power solutions for their portable models. Offerings extend to batteries for CB radios, scanners, and other two-way communication equipment, ensuring operators can maintain field operations. The inventory includes specific battery eliminators and replacement packs designed to meet the power requirements of various handheld radios. Customers can find suitable power accessories for digital cameras, PDAs, and cellular phones, alongside specialized batteries for Nextel radios. The focus is on providing reliable power sources for critical portable electronics.

Key facts about how to solder, how to solder wire, how to solder pcb's, and including general soldering techniques and the best ways of making good solder joints for electronic circuits and construction. Includes video

Banana plugs, coaxial cable assemblies, patch cords, oscilloscope and DMM test lead and probe kits and accessories, IC test clips, boxes, RF connectors, XLR and 75-ohm cable assembly products.

Taking the Raspberry Pi 2 for a Test Drive with GNU Radio. Installing GNU Radio and receiving aircraft radar with a USB TV tuner

Index of main electronics topics

Techni-Tool is a distributor of electronic production tools, oscilloscopes, multimeters, power supplies, cases, tool kits, cutters, wrenches, crimpers, solder desolder stations, BGA, microscopes, lamps, static control, workstations, chairs, torque screwdrivers, tweezers, dusters, chemicals.

Collection of several Crystal Radio receiver circuits with schematics diagrams and pictures

Pagina personal de Radioaficion, Satelites, Antenas, Electronica y Aviacion

Janielectronics RF microwave devices online store

Electronic distributor, specializing in capacitors

PL-259, Motorola & N connectors, Coax Seal, universal adapter kit, TNC, Mini-UHF, SMA, F & BNC connectors, audio connectors,antenna mounts and antennas

This site is dedicated to those who enjoy building radios and other electronic devices using parts and techniques from bygone eras.

A MacOSX antenna design and electronics/electrical tool package. It is a multipourpose application that allow antenna design and comomn calculations

Design, build and supply Military Diesel Operated Tactical generator sets, diesel generator sets, custom generators, auxiliary power units, portable power generators and tactical quiet generators used by the U.S. Navy and Air Force.

A resource for Collectors and Restorers of Vintage Electronic Equipment.

Desgining crystal filters and find out crystal data by measuring it.

Consumer solar power products, portable solar panels maker, Solar Mini Panels & Control Electronics.

Essentials or basics of RF signal generators or microwave signal generators, their facilities, capabilities and how they work.

Search engine for electronic component datasheets and application notes.

Marshall G. Emm, N1FN, meticulously examines iambic keying, dissecting its historical introduction in the late 1950s with transistorized electronic keyers and its purported advantages. The resource defines keying systems, electronic keyers, and various paddle types, including single-lever and dual-lever paddles, clarifying the distinction between iambic keyers and the iambic sending technique itself. It details the two main types of squeeze keying: true squeeze for alternating dot-dash strings and character insertion for specific elements within a character. N1FN critically evaluates the actual efficiency gains of iambic keying, referencing Chuck Adams, K7QO's, keystroke analysis. While a straight key to bug transition yields a 34.1% reduction and a bug to non-iambic keyer offers 16.1%, iambic keying provides only an 11% theoretical improvement. However, considering typical QSO text and Morse code's inherent optimization for common letters, the practical efficiency gain is estimated at a modest 4-6%. The article also highlights how iambic keying's reliance on precise timing gates can impose a speed limit, making it less effective above 40 WPM, where many operators revert to non-iambic methods or single-lever paddles.

A guide to making good soldered joints and desoldering tips, includes an interesting how-to-guide on properly soldering electronic components

A nice tutorial and the basics of the software defined radio, SDR, and links of software defined radios to JTRS, and general SDR receiver technology.

Italian amateur radio and electronic components shop based in Firenze Italy

The _Sci.Electronics FAQ: Repair: RFI/EMI Info_ document, authored by Daniel 9V1ZV, provides a detailed analysis of computer-generated RFI/EMI, focusing on its impact on radio reception. It identifies common RFI sources such as CPU clock rates (e.g., 4.77 MHz to 80 MHz), video card oscillators (e.g., 14.316 MHz), and even keyboard microprocessors, all of which generate square-wave harmonics across HF and L-VHF regions. The resource outlines a systematic procedure for pinpointing RFI origins, including disconnecting peripherals and using a portable AM/SW receiver with a ferrite rod antenna to localize strong interference sources. The document categorizes RFI mitigation into shielding, filtering, and design problems, offering practical solutions for each. It recommends applying conductive sprays like _EMI-LAC_ or _EMV-LACK_ to plastic casings of radios, monitors, and CPUs to create effective Faraday cages, emphasizing proper grounding and avoiding short circuits. For filtering, the guide suggests using line filters, ferrite beads, and toroids on power and data lines, and small value capacitors (e.g., 0.01 uF for serial/parallel, 100 pF for video) to shunt RFI to ground. It also discusses the use of bandpass, high-pass, low-pass, and notch filters on the receiver front-end or antenna feed to combat specific in-band noise.

New and refurbished test and measurement instruments

Tait electronics provides advanced and reliable voice and data radio communications products and solutions, specialising in customised solutions for organisations worldwide.

An overview of coax cable often called coaxial feeder or RF cable, used to feed antennas and deliver radio frequency power from one point to another

A project of a linear regulated for low noise power supply 16v, 10A

Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave. Antenna for amateur radio bands

Electronic test and measurement; digital multimeters, clamp-ons, portable printers, meters and dataloggers.

Manufacturer of advanced electronic systems to measure such weather data as: wind speed, wind direction, wind chill, pressure, humidity, rainfall, and dew point.

Spanish makers or signal generators, spectrum analyzers, testers

This code practice oscillator project uses a 555 timer IC. Includes a Schematic Diagram of the morse code oscillator

Telecomunications import export, ham radio dealer based in Belgium for MicroHam, MFJ, LDG, ICOM Yaesu and other ham radio brands

Non-profit Amateur Radio club organized for the educational and scientific study of electronics and communication

Provider of electronic components documentation. Offer a reliable tool to find semiconductors components technical information like parts, datasheets, cross reference, obsolete and new circuits.

Electroswitch Electronic Products specializes in the design and manufacture of various switch types, including rotary, toggle, pushbutton, and rocker switches, as well as encoders and indicator lights. The company provides commercial and MIL-spec compliant components, detailing features such as spring return, push/pull to turn, adjustable stop, concentric shaft, and keylock configurations for their rotary switch lines. Specific product series like the M5-series enclosed frame rotary switches are highlighted, demonstrating their engineering capabilities. The resource offers a Rotary Switch Configurator to assist customers in selecting appropriate components based on application requirements. It categorizes switches by construction, such as enclosed frame, open frame, military grade, sealed, subminiature, blade, and power options for rotary switches. Toggle switches are presented in miniature, full-size, military grade, and sealed variants, while pushbutton switches include ultra-miniature, miniature, standard, and sealed types. Further product details cover rocker switches in subminiature, miniature, and sealed configurations, alongside thumb switches. Encoder offerings include magnetic and mechanical types with options like concentric shafts and push-to-turn functionality. Indicator lights are available for both commercial rectangular panel mount and MIL-spec applications, featuring configurations such as Press-to-Test, Watertight, EMI Shielded, and Dimmable options.