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Delta Electronics, Inc. NY USA, family owned and operated selling all varieties of consumer electronics including 10 meter amateur radios, antennas, accessories, microphones, cw transmitters, coax cables and more

Tom's amateur radio web site provides information about Ham radio in the heartland of America. Nebraska and Iowa, USA

New, used, & reconditioned electronic test & measurement equipment sales, rentals, & service. Agilent/HP Spectrum Analyzers, Tektronix Oscilloscopes, Fluke Calibrators, & much more.

Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).

Setting the pace in Cleveland County Amateur Radio for over 50 years. ARRL Affiliated / Sponsor for ARES (amateuer radio emergency service) of Cleveland County, NC. Sponsor of the famous Shelby Hamfest

The history of radio documented in thousands of publications including copies of popular US and UK amateur radio magazines and newsletters since 1930s

The wikipedia article about NVIS Near vertical incidence skywave with information about usable frequencies and some general information on main NVIS oeprations usages

ham radio clun in Vermont USA

W9TY, the Metro DX Club of South Suburban Chicago, Illinois, USA.

An article on origin and usage of the Decibel, that has always been a logarithmically based representation of a power ratio

Communicating from the West River Valley in Windham County, Vermont, USA

About usage of DTMF Dual Tone Multi Frequency in ham radio applications

Fort Knox Amateur Radio Club Kentucky USA

Article on operating aids and band usage during solar minimun periods. Author tries to explain what can we expect on the HF bands during a solar minimum period and which approach to be used to understand band openings.

First impressions of the Icom IC-7851 Flagship Transceiver after some days of usage

An exaustive article on how to receive the QO-100 geostationary satellite, that carries transponders usable by amateur radio operators

Manufacturer of software definded radio receivers, antenna switches, preselectors, antenna splitters based in Italy and USA

Police Live Audio Feed from Elko City USA

Police radio scanners, accessories online shop includes radio scanner resources based in Minneapolis, MN USA

This paper presents the method of calculating the maximum usable frequency (MUF) and field strength of radio waves reflecting 2 times at the F2 ionosphere layer under inhomogeneous conditions of the ionosphere. The comparison between predicted and measured MUF has shown that the proposed method significantly increases the accuracy of calculation MUF.

Adapting a common PC earphone with microphone to connect to a transceiver via a homemade pre-amplifier, using a simple chip with aprox 10 db gain. Includes a schematic diagram

Mason County Amateur Radio Club / Washington State USA

Ultimax antennas manufacturer of amateur radio End-Fed and bazooka antennas made in USA

927.1250 MHz Santiago Peak, CA USA

With over 1700 members CARMA is the largest scanner club in the USA. We support all facets of public safety and promote responsible radio monitoring.

GREENSTONE USA leader in the Vacuum Industry manufacturing products such as Vacuum Tubes, Vacuum Capacitor, Vacuum Relays, Vacuum Contactors and Vacuum Interrupters.

Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners

Malcom Technical Support Radio Electronics Repair, ICOM Authorized Service Center, also service 1988 and newer Kenwood HF/VHF/UHF transceivers based in Toledo, WA USA

An article by MicroHam on using the Icom PW-1 RF Power Amplifier safely and with non-Icom transceivers.

Sporadic E is a form of propagation that can arise with little warning, and enable radio frequencies of 150 MHz and more to travel over distances of a thousand kilometres and more.

A light portable 2 element Delta beam antenna for 14 MHz. It is basically a two element delta loop wire antenna made for portable usage providing good directivity and a 4.2 dBd gain

Roane County, Tennessee, USA

General informantion and introduction to D-Star explaining what is for D-Start and the practical usage of D-Star in amateur radio communications

Amateur radio station in Parsons TN USA

Aircraft scatter is easily seen on the spectrogram window of digital communication apps, when you know what to look for. Examples of real aircraft scatter usage on six meters band

Ham radio club based in Fort lee NJ USA

Barry County, Michigan, USA

Review of Ameritron AL-82 HF amplifier, owned for three years now, and over that time, it has given me incredible performance on all bands. Inclueds a comprehensive usage report and a summary on Pro and Cons of this amateur radio RF amplifier

A 3 band dipole antenna for 40-80-160 meter bands, It's made with easily available materials and is designed for inverted V mounting. The antenna is shortened for these bands, but still manages to make contacts in 80m and 160m with stations in Canada and the USA. The construction details are provided, including the dimensions of the antenna elements and the traps. The antenna is easy to build and provides good performance in all three bands. In Italian.

Online HF Communication prediction system provided by the Australian Governament Buerau of Metereology allow to predict usable frequency rage for radiocommunications between two stations allowing to specify frequency and date range. This tool allow calculation with different methods and algorithms

Probemaster manufacturers probes of all kinds, including oscilloscope probes, differential probes, test leads and much more, all proudly made in the USA

This is an uncommon loop antenna, hombrewed without the small feeding loop. With small spare parts is possible to build a loop antenna tuner for portable usage tha can ben used with common HF QRP transceivers

NARRI is to promote the development of amateur radio repeaters in Nevada USA

A portable loop antenna, made with a 3 meter loop resonates with the chosen capacitor from just below 7MHz to about 28.300MHz which makes it usable on the bands from 40m to 10m.

Manufacturer RF coaxial cable assemblies for all purposes including GPS, Wifi, RFID, EMS/Police, Military, & Marine. Coaxial cable assemblies made in Albany, Georgia USA

The video showcases the setup of a 300 MHz oscillator, a 100W radiofrequency amplifier, and a dipole antenna for transmitting radio waves, leading to the fluorescence of a nearby light bulb. It demonstrates the presence of standing waves on the dipole antenna and how intensity varies along its length. Additionally, the usage of a copper pipe as a receiving antenna is explored, showing changes in intensity depending on alignment and proximity to the transmitter. Finally, a B field antenna sensitive to magnetic fields is introduced, revealing brightness variations in different orientations. The video offers insightful observations on radio wave transmission and reception phenomena.

Bay Area ham radio club, Bay City, Michigan USA

The Murgas Amateur Radio Club is an ARRL Special Service Club in Wilkes-Barre, Pennsylvania, USA.

This antenna works on 17, 20, and 30 meters, with the best bandwidth on 20 meters. The bandwidth on 17 and 30 is quite small but usable. There is a 20 KHz bandwidth on 20 meters.

Otto enhances WSJT-X, the popular weak-signal digital modes program for amateur radio. It automates tasks like managing QSOs, prioritizing DX stations, replying to specific calls, and optimizing band usage. Otto works with a modified WSJT-X version (v2.7.0) to add advanced features such as directed CQs, automatic logging, and multi-stream replies. Its intuitive modes streamline operations, while safety measures ensure controlled transmissions. Ideal for DX enthusiasts, Otto improves efficiency and focus, making weak-signal operations more engaging and productive.