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Ham radio blog from CX3SS Uruguay

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

Full color QSL printer in Poland

Spectrum Microwave is a market leader in the world of RF & Microwave components and system

Portable heavy-duty gas generators

Ham radio for people with disabilities provide podcast and blog

Germany manufacturer of solar energy products

Setting up Digital voice keyer via USB for Kenwood TS-590

MF TeleType is a program for amateur radio digital communication via sound card, ham radio chat program for extra reliable text transmissions over long distance

This article reports and collect some frequencies used during 2020 Ukraine war and reported as being used by army forces. HF communications are still a crucial part of military communications and can ben monitored on web sdr radios available on the internet.

This page only applies to TH D7A's that have a S/N below 010xxxxx and have not had their firmware upgraded by a Kenwood Service Center.

A home made 50 MHz KW power amplifier project with picture and PCB schematic by W6PQL

Discover the huge amount of components inside Compact Fluorescent Lights

KB6NU end-fed, half-wave antenna article and project

The Superantennas MP-1 portable HF antenna is analyzed for its design and field performance, particularly its high-Q loading coil and 3/8-inch mounting. The review details the antenna's construction, including an 8-inch vertical section, a large-diameter loading coil tuned by a sleeve, and a 4-foot whip that disassembles into six rods for transport. Initial testing with the supplied 10-foot ribbon cable "ground plane" yielded poor SWR and RF hot conditions, indicating an inadequate ground system. Further experimentation with longer radials and resonant counterpoises for each band improved matching and eliminated RF hot issues, but introduced significant operational complexity. The author notes the difficulty in optimizing both counterpoise length and coil setting without an antenna analyzer, and the sensitivity of the MP-1 to counterpoise deployment. The review also discusses the recommendation to tune for maximum received signals rather than minimum SWR, often necessitating an external ATU due to the antenna's typical low impedance. The **MP-1**'s critical dependence on resonant counterpoises for effective operation, especially when elevated, is highlighted as a major drawback for portable use. The author ultimately sold the antenna, concluding that despite its sound technical design, its fussy nature and the need for extensive counterpoise management or an ATU detract from its portability and convenience compared to simpler, less expensive dipole solutions. The **Superantennas MP-1** is deemed a flawed portable antenna, requiring considerable effort to achieve its claimed performance.

10MHz WSPR and QRSS Transmitter Project

Constructing a directional antenna for the 6-meter band (50 MHz) can significantly improve signal strength and reduce QRM during local ragchews or **Field Day** operations. This project details the assembly of a Moxon rectangle antenna, known for its compact size and respectable gain, making it a practical choice for portable or fixed station use on the magic band. The design utilizes readily available materials such as 14 AWG copper wire for the radiating elements and PVC pipe for the frame, ensuring an inexpensive build. The article provides specific dimensions and construction steps, allowing radio amateurs to replicate the antenna with confidence. It emphasizes achieving a low **SWR** across a bandwidth exceeding 1 MHz, crucial for efficient power transfer from the transceiver. Performance characteristics include a reported 5.5 dBi gain and a front-to-back ratio of 20 dB, offering effective directivity. The project also highlights the antenna's suitability for Field Day, where quick deployment and reliable performance are paramount for maximizing contacts.

Exploring these mysterious transmissions and how their strong following has created a niche in the community. Free article in PDF Format from QST November 2019

The document explains the technical aspects of how the Internet Radio Linking Project (IRLP) works, focusing on the use of VoIP streaming software under the Linux operating system. It details the audio sampling, compression, transmission, reception, and playback processes involved in IRLP communication.

Hard to find Kenwood Parts available for shipping worldwide

The radio website that respects the Civil Air Patrol and their copyrights. Home of the world's largest radio/scanner frequency database, include live police scanner recordings

RF Solutions is your authorised distributor of superior amateur radio products in Australia, New Zealand, and the Asia Pacific region

Win32 command line utility, that allows you to create Master Callsign Database file (DTA), used in many contesting programs, from different logs in ADIF, Cabrillo, and plain text formats.

Chip64 yahoo group, discuss about IZ8BLY chip 64 mode

A different implementation of the G7FEK HF multiband antenna with some adjustments and modifications

A manufacturer of standby and prime power generator sets for industrial, telecommunication, commercial, small business, mobile and residential applications.

Resources for custom battery chargers and power supplies from powerstream

The _Letter Post Regulations_ article RL 128 defines specific dimensional requirements for address placement on envelopes, crucial for efficient postal processing. The addressee's address area must be positioned at least **15 mm** from the right and bottom edges, and at least **40 mm** (with a 2 mm tolerance) from the top edge, extending no more than 140 mm from the right-hand edge. These precise measurements ensure rapid optical reading and facilitate manual sorting and delivery by postal services. Adherence to these Universal Postal Union (UPU) standards prevents interference with indexing, coding, and address detection areas, which must remain blank. While individual countries may adapt these values, they must maintain a minimum address area width of 74 mm. Proper placement avoids extraneous markings to the right, below, or within a 15 mm wide area to the left of the address, extending from the first line to the bottom edge, and a 15 mm high by 140 mm long area from the bottom-right corner.

Ham radio yagi beam antennas manufacturer based in NY USA. Produce monoband and multiband yagi antennas fot HF and VHH

Fine tuning your Multiband Hustler Vertical

Article on a QRSS receiver for 30 meters band

Passive Band-Pass Filter, low-pass filter calculator

Long review of the Elecraft K3 , 18 months on.

Paulo Sousa ham radio blog with QSL pictures

Debco electronics, inc. - computers and electronic components for business, developers and hobbyists

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.

Ararat Shrine Radio Club of Kansas City

L4B by Drake amplifier mod

This program locates the Sun and Moon in real time using a full set of ephemeris factors. Gives azimuth, elevation, right ascension, declination, and range to each.

A selection of speakers or headphones for use with amateur radio equipment. Includes an interesting paragraph comparing Dynamic and Electret Condenser Microphones, but also about audio Equalization.

QSL Printer shop, products include Photo QSL cards, Eyeball cards, and State QSL Cards, based in Hampstead, MD USA

Manufacture high quality low cost powder cores with a wide selection of shapes

A borderline insane 30m QRSS beacon project, completely independent of computer control and containing NO microprocessors!

A study on 20m antennas by Kenny Silverman, K2KW

HF VHF UHF antenna ideas to be used for field days. All antennas are quick to set up and take down and offer proven performance and flexibility. Presentation offered by Mahoning Country ARES

A Microvert antenna by KD5RVX based on the original microvert concept by DL7PE. PDF includes a 20 foot portable PVC tower project

MiniDSP is a platform for digital audio signal processing applications. Manufacture low cost digital signal processor kits for the DIY/OEM market. Our flexible audio platforms are software controlled and easily upgradeable.

This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. Using a simple RTL-SDR Dongle and Raspberry Pi 3 computer using GNU RADIO

Yaesu FTDX10 vs. ICOM IC-7300 Comparison Chart and review of reception performances

A simple drawing schematic of a portable field dipole for 14 MHz with dimensions in meters and instruction for setting up the antenna and to store the radial for easy transportation