Search results

Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor

Echos of USAF (Formally NAVSPASUR) radar signals reflected off of meteor trails received at Roswell, New Mexico

A complete DIY Raspberry Pi Weather Station including software, capable to read wind speed, wind direction, rain gauge and with a temperature and humidity sensor along to a camera.

Standard time zone map of the world in a jpeg file

A javascript online calculator for popular wire antennas, from the standard easy to build flat-top dipole, to the inverted V dipole, but also the Quad Loop, and the equilateral delta loop antenna

Live streaming audio of the K7ICU repeater

Notes on W3EDP Antenna by M1KTA

The resource details the construction of a **Hustler-compatible** HF mobile antenna mast, utilizing 1/2-inch copper water pipe and common hardware. It provides a bill of materials, specifying one 10-foot copper pipe, four 1/2-inch copper end caps, and 3/8-inch fine-thread hex bolts and nuts, totaling $8.75 for two masts. The construction process outlines preparing bolts by rounding their heads, drilling 3/8-inch holes in end caps, soldering bolts into caps, and then soldering these cap/bolt assemblies to 5-foot sections of copper pipe to achieve a final length of 54-1/4 inches per mast. The method emphasizes precise soldering techniques to ensure structural integrity and proper fit. The resulting masts are presented as functional alternatives to commercial units, with the author noting their performance is comparable to the "real thing." Installation tips are provided, including the use of braces connected to a trunk lid to mitigate stress on the antenna mount, contrasting this approach with WA8WTE's spring-based method. Photos illustrate the completed mast mounted on a vehicle, demonstrating practical application and support strategies for mobile HF operation, particularly with larger coils and longer whips at highway speeds.

A portable amateur radio station which the radio amateur can take when asked to go to an event which needs support with radio communication.

Centre fed half wave dipoles make great, simple and effective antennas for the HF bands. Sometimes however, the centre feed is not ideal. This great project will improve the overall antenna performance.

Hellschreiber is an interesting ham radio mode developed back in the 20s. It is a bit strange and different, but fun. I'll explain what it is, then I make a couple contacts during the Hellschreiber contest.

Chinese manufacturer of Software Defined Radio for commercial, public and amateur radio market. Markers of H1 H1Plus H2 Q900 SDR transceivers

Located in southern Ontario Canada, supplier for HF VHF antenna kits, aluminium tubing, portable j-pole antennas, lightning suppressors, connectors and adapters

Service manual in PDF Format for the Yaesu FT-7800 transceiver

PocketSat3 satellite tracking software for iPhone, iPad, and Android devices

An end fed 20 meter half wave antenna

A magnetic longwire unun with a T130-2 Iron Powder core by M0UKD

How to make a half l or quarter l coax cable for a specific frequency

Reference guide for amateur radio equipment. View, compare and share ham equipment specifications and personal experiences.

Bird Technologies supplier of RF products, like RF Meters, Bird 43, VNA, Spectrum analyzers, attenuators, transmitters combiners, dummyloads, terminators and replacement parts

Ferrite rod antenna or aerial, a form of RF antenna that is widely used in RFID and transistor radio applications.

SDL is a dedicated contest logger for SWLs. It's good for all the major international contests and for dozens of others worldwide. SDL is fully working and unrestricted, and is distributed as freeware. It links to Icom, Kenwood and Yaesu radios to follow band and mode changes.

Part 2 - Ten-Tec Jupiter CW copying and keyboard transmit

Manufacturer of led digital clocks, digital timers, countdown clocks, electronic kits, audio switches, binary clock, telegraph keys, and cool gadgets.

A 70cm and 2m 6 elements yagi antenna plan based on the IEEE Transactions on Antennas and Propagation

A Tribute to Morse telegraphy and resource for wire and wireless telegraph historians and key collectors

VHF UHF diplexer by G8MNY

Presents the construction of a 6-meter (50 MHz) Moxon wire beam antenna, detailing the use of #14 AWG THNN stranded wire and a treated wood frame. It covers the assembly of a galvanized pipe mast, emphasizing the use of pipe sleeves for joint reinforcement over threaded couplers to prevent breakage during raising and lowering operations. The resource also describes the integration of a 1:1 current balun, rated for 50-54 MHz, and the use of RG-8X coax for the transmission line, recommending low-loss alternatives like Belden 9913-7F. Further, it outlines a manual rotation mechanism using pipe hanger clamps and carriage bolts for true North orientation, incorporating magnetic declination calculations from NOAA. The antenna's performance is discussed, noting good gain and take-off angle, with SWR tuning facilitated by a Palstar AT-500 manual tuner. An EZNEC+ 5.054 model for the antenna is available for download, alongside predicted radiation patterns and SWR curves, compared with actual AIM-4170C measurements.

Yaesu FT-450, FT-950, FT-2000, FT-5000, FT-9000 backup and restore Program for win32, requires login to Yahoo Groups

Open-Wire/Twinlead Antenna Switch

How to build a simple WSPR beacon using the Raspberry Pi for the transmitter

Sound Byte is a voice keyer for contests as well as general ham radio use. Windows and Mac, commercial by Black Cat Systems

Audio setting and improvements for Yaesu FT-2000 by k6jrf

A High-End UHF Preamp for the VHF/UHF Dongle

Laws, rules and regulation on scanning expecially in the usa

Key your transmitter from the tone output of a Morse Code generator program

Analyzing FCC amateur radio license issuance data, this resource presents monthly graphs and raw numerical statistics detailing the number of new and upgraded amateur radio licenses. The primary focus is on the impact of the Element 1 Morse Code test removal on HF privileges, specifically observing the transition rates from _Technician_ to _General_ and _Extra_ class licenses. Data is sourced from _QRZ Archives_ and processed using a custom Perl script to tally "Issued" licenses each month. The presented data, available in graphical, tabular, and raw XML formats, clearly illustrates the "spike" in General class upgrades following the rule change. It also highlights a consistent rise in new Technician licenses observed in March of both 2006 and 2007. While the dataset currently extends back to January 2006, providing a limited statistical snapshot for long-term Technician trends, it effectively captures the immediate climb in General class licenses.

NUE-PSK Digital Modem A digital modem for PSK31 field operation, without using a PC

The Folded Dipole is not used much amongst Radio amateurs, probably due to the fact that this antenna uses twice as much wire as a single-wire dipole.

FT-847 Specifications

Comparison of 50 and 70 Mhz antennas, commercial and home made projects

A Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbars.

A ATU for beam and vertical antennas by PA0FRI

Chuck Dachis author of radios by hallicrafters. common/unusual Hallicrafters, wanted, FAQ, links, and other treasures

This is the Loop Antenna Group to Ask Your Questions, Get Answers and Information about Loop Antennas for improved your Radio Listening and Enjoyment.

A Slinky-based doublet or loaded vertical QRP antenna tested for 40 meters band

A homebrew Magmount for 2m antenna

Interesting article on multiband fan dipoles. This article give an overview on designing this wire antenna, and planning a robust installation and proper feed line. Includes notes on setting up a commercial fan dipole antenna and on how diy your own.

Iphone app for ncdxf IARU beacon monitoring, shows the currently transmitting beacon on each band, reception charts from the active monitoring stations, and latest solar flux A and K indices

This antenna analyzer measures complex impedance over the 1.6 - 33 MHz HF spectrum