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CommCat Mobile is a free integrated spot management, remote radio control, and logging app for the iPhone. CommCat is required for remote control.

The document titled 'Extending the Range of Your Handheld' by WG7S is a guide on how to extend the range of your handheld VHF UHF transceiver by using an external antenna. It provides information on comparing popular models, selecting the right antenna, and resources for amateur radio antennas.

K0GKJ project of a copper tube slim jim antenna for two meter band

Article describing how to homebrew a yagi antenna for 50 MHz, includes plans for a four and five elements yagi beam and details how how match impedence with a gamma match

Live Fire/EMS feed from Eastern King County, WA as dispatched by Eastside Communications

A PDF File of a Maria Maluca multiband HF antenna with schematic diagram, dimension and plan

High quality VHF/UHF Yagi (directional) antennas

Ham radio frequency list consolidation software. The Ham Radio database can house a unlimited number of records. Holding frequency information from DC to Daylight. The Radio Scanner Database is designed to emulate a radio scanner. A 5,000 record table is provided and is organized by channel number.

Youtube video about Yaesu Vertex VX-6R

A simple fixed frequency SSB voice transceiver for the 7 MHz amateur band

Competent all-around 2-meter mobile transceiver, review by W4TI

Various configurations of the Z Match Tuner are tested for power efficiency over a wide range of antenna load conditions

GPS module for Yaesu VX-8DR/DE handheld transceivers with ublox NEO-6M chip and Arduino Nano.

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

QSL printing service based Bulgaria and managed by LZ1JZ, offer from single color to full color qsl cards.

What become our QSL once sent ? QSL routes, IRC and green stamps, the best and worst practices.

Enhanced SSB Audio (ESSB) is a specialized operating mode that extends the capabilities of traditional Single Sideband (SSB) voice transmissions. This presentation by K4QKY delves into the technical aspects of ESSB, discussing its advantages and the ongoing debates within the ham radio community regarding audio quality and bandwidth usage. ESSB aims to provide clearer and more natural-sounding audio, which can enhance the overall communication experience for operators. The presentation covers various topics, including microphone selection, audio processing techniques, and the importance of proper equalization. It also addresses the controversies surrounding ESSB, such as the potential for interference and the debate over whether it strays too far from traditional SSB practices. By understanding these elements, amateur radio operators can make informed decisions about their audio setups and contribute to discussions about the future of SSB operations.

The 10-minute, 25-second video demonstrates making a QSO via the VO-52 amateur radio satellite, focusing on real-time Doppler shift correction. It features Simon, 2E0HTS, operating a Yaesu FT-847 transceiver and a homebrew dual-band Yagi antenna, specifically a 10-element 435 MHz Yagi for uplink and an IO Loop for 145 MHz downlink. The video visually details the operator's technique for continuously adjusting the uplink frequency to compensate for the satellite's changing velocity relative to the ground station, a critical aspect of successful satellite communication. The demonstration highlights the practical application of Doppler compensation, showing the operator tuning the transmit frequency to maintain a stable received signal from the satellite. This approach contrasts with systems employing automatic Doppler correction or full-duplex operation, providing insight into manual frequency management for satellite passes. The video serves as a direct, observational guide for hams interested in LEO satellite operations, particularly those using non-tracking, manually tuned setups.

Making portable pperations easier, N1GY present a different way to make a tilt-base and mast

W0FMS Two-Wire Beverage (SWA) Transformer Calculator

Icom Australian web site

Special test lead that converts your regular DC voltmeter to a RF reading voltmeter

A google map of the UK amateur radio repeaters with clickable information

Whith more than 20 years of ham practicen SWL Thierry LOMBRY, alias ONL5183, has written several technical pages about ham activities, including propagation, radio perturbations, radioastronomy, DXing, QSLing, ham-spirit, review of material and more. This very interesting website is completed by a large French section devoted to amateur astronomy illustrated with vivid colors pictures.

Extremely reliable FET preamplifier can handle several watts directly into either the input or the output without failure

The purpose of this web page is to try to investigate some of the issues around ICOM IC-746PRO reported by many radio amateurs through out the world; and unfortunately not properly taken care of by ICOM.

This homepage introduces Palau Rental Shack for the visitors who enjoy amateur radio in Republi of Palau.

Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght.

Building a 1:1 balun, aka un-un, with an Amidon Ferrite toroid core T 200

Speakers for Amateur Radio, 2-Way Radio, Shortwave and Scanner listening

Ham radio site devoted to classic collectible amateur and military radios, featuring vintage ham radio color photos and commentary, free downloadable manuals and pamphlets and links for ham radio hobbyists.

1500 watts PEP output from a Kenwood TL-922 amplifier requires careful attention to parasitic suppression and component selection to ensure stability and longevity. This resource critically examines common modifications, often based on anecdotal evidence rather than sound engineering principles, that can degrade performance or introduce new issues. It highlights how replacing aged components often gets misattributed to the efficacy of unnecessary modifications, leading to widespread misinformation within the amateur radio community regarding amplifier stability. The article details specific, effective modifications for the TL-922, such as shortening anode-to-chassis and anode-to-grid paths to improve VHF stability and efficiency. It addresses issues like incorrect capacitor types in the tank circuit, inadequate grid grounding, and poor RF sheet metal design, providing practical solutions like adding direct ground connections for the plate tune variable capacitor. The author also discusses proper parasitic suppressor design, emphasizing the importance of lead length and component selection for optimal performance and harmonic suppression, contrasting these with less effective or detrimental 'magical suppression kits'.

The system consists of a pair of Morse practice oscillators connected by a piece of two-conductor cable. Pressing the key on one unit produces a sound in both units by Peter Parker VK3YE -

A spanish commercial windows PSK Software, demo version is available by EA1CUI

UK based online shop for cb and amateur radio equipment and related accessories

Only 2x 10ft wide, performance similar to full-size dipole, covers whole band with SWR better than 1:1.2.

This scheme can be used to combine two antennas

Italian ham radio shop based in Milan

Far East Broadcasting Company (FEBC) - Manilla, Philippines.

Ideas and notes on designing a SO2R radio shack room. Includes lots of radio shack pictures used by K8ND as ideas to plan his new radio shack, with contesting in mind.

Frequency allocation in Santa Barbara California

Decode Slow Scan TV (SSTV) on your iPad, iPhone and iPod Touch by Blackcatsystems

Distributor of aluminum and a manufacturer of finished aluminum products. Pierce Aluminum offers a diverse inventory and distributes a complete line of sheets, coils, plates, bars, structural shapes, tubes, pipes and extrusions in the most varied alloys and sizes possible

Technical experts in RF path protection

A simple portable VHF ground plane antenna project used for ARES activities

West mountain radio, Useful electronic hobbyist products, RigBlaster and RIG Runners products, Waukesha, WI.

Modelling an horizontal Loop antenna at 3.5 MHz

Exaustive shortwave dx and tech resources for BCLs.

How To Connect Elecraft KX3 To iPad

A review of the IC-7000 at Delta Alfa