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eham review of the ICOM IC-756PRO

Stryker 10 Meter Amateur Radio trasceivers, antennas and accessories manufacturer

Kenwood TS-2000 Transmit / Receiver eSSB Modifications by N3GX

Two tables comparing several coax cables on attenuation and power ratings

We have a wide range of power protectors and surge protection products available

Kennedy Safaris, cheap,well organized and ham radio friendly

Microphone tips for the Icom 706MkIIG

West St. Louis County Police and Fire Live Audio Feed

October 2003 QST article on working digital mondes with sound card interfaces

Basic site with links to amateur radio information and scanner info

quality Quartz Crystals, Clock Oscillators, VCXO's and TCXO's

Use this online calculator if you need to know your azimuth/elevation relative to a satellite

Ham radio HF antennas manufacturer, produce HF dynamic beam antennas, and vertical pole antenna. Offer kits and parts to build you own dynamic antennas, by IZ0AEG

The correct way to calibrate the MFJ-259B analyzer

VK port-a-log is an Android logging app primarily for portable logging. It can be used for SOTA, WWFF or portable operations.

Ham radio blog from mexico mainly in spanish

Two cheap CMOS ICs and a few transistors was all that was required to rebuild an elderly TTL automatic morse keyer into a low current lightweight battery powered iambic morse keyer.

Have you ever thought of setting up a portable HF station for an activity ?

A group of local hams who operate nightly on simplex and discuss all sorts of topics

Grupo Argentino de CW

Ham radio shop in South Salem, NY, dealer for Alinco, LDG, Cable X-perts, Jetstream and several antenna types and makers

Another general tutorial on BPL

Presents a dedicated logging solution for amateur radio DXpeditions, addressing the unique operational demands of remote or temporary stations. This freeware Windows application provides essential tools for managing QSO data, ensuring accurate record-keeping during high-volume operations. The software supports efficient entry and retrieval of contact information, crucial for verifying DXCC credit and submitting contest logs. It streamlines the process of logging contacts, which is vital when operating from rare entities or during intense pile-ups, helping operators maintain focus on making contacts rather than complex data management. The application aims to simplify the logistical challenges associated with DXpedition logging.

A Resonant FeeD line (RFD) antenna for 7 MHz prohect tested and tuned.

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.

Demonstrates the design and functionality of _uLog_, a Windows-based logging application for amateur radio operators. The resource details its core purpose as an easy-to-use logbook, emphasizing its streamlined interface that provides only the basic fields necessary for efficient QSO entry. It positions _uLog_ as a practical alternative to more complex logging software, catering to operators who prefer simplicity and speed in their logging workflow without an abundance of advanced features. The application's utility is highlighted by its focus on fundamental logging tasks, distinguishing it from comprehensive contest loggers or DX cluster clients. While not explicitly comparing it to other specific software, the description implies its niche for everyday logging rather than specialized operating events. Its design philosophy prioritizes quick data input, making it suitable for casual operating or for those who desire a minimalist approach to maintaining their station log.

Software defined radio products. Maker of AFEDRI SDR a direct sampling Software Defined Receiver by 4Z5LV

Ham radio Dxpedition

The Highland Amateur Radio Association (HARA) centers itself in Hillsboro, Ohio.

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.

Introduction to WSPR beacons. Article describe WSPR2 and WSPR15 beaconing mode and include a frequency reference table for both WSPR modes

MS Excel document that allows you to plot SWR, resistance, reactance, impedance magnitude and angle and more from a variety of sources

Article by K0BG on automatic antenna couplers, erroneously called antenna tuners with reviews of popular tuners and basic concepts.

Ham radio activities, from satellite operations, eme communications, dxing and contesting, qsling and direction findings, are just some of ham radio exciting activities

Amateur radio kits. Makers of the WinKeyer, their goal is to keep homebrewing and kit building alive.

This converter uses the popular NE602 mixer/oscillator chip and allows reception of signals below 500 kHz on a 3.5 – 4 MHz HF receiver

A homemade GPS for TM-D710 using a Telit Jupiter JN3 GPS unit

A Low Power Indoor Portable HF Antenna by N5ESE

QSL Cards from the past, ham radio QSL Card collection by W8JYZ

This is a schematic drawing of a project for the construction of a portable mast that can easily be made with PVC pipes.

Adding 17 meter band to Mosley TA-33M yagi antenna

Rules of CQ World Wide RTTY Contest. The CQ World Wide RTTY DX Contest take place last full week-end of September, inviting amateur radio operators globally to connect across various CQ zones and countries. Participants will operate on five designated bands: 3.5, 7, 14, 21, and 28 MHz, exchanging RST reports and zone numbers. Scoring is based on QSO points multiplied by zone, country, and QTH multipliers. The contest encourages innovation in operating strategies while adhering to established rules to ensure fair competition among entrants.

Personalized map company makes custom maps for ham radio enthuasiasts

How to calculate range for a VHF antenna with a simple formula and how to increase VHF coverage.

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.

VQSpot is a simple utility program developed for sending DX-Spots automatically when QSO are logged into VQLog

NFDXA On-Line Eritrea DXpedition Log

Current info on DX, special events, awards, FIRAC

Amateur Radio Station OD5SK , Op.Samir Khayat Tripoli Lebanon