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Founded in 2000 by Jim Weidner, K2JXW, the ARLHS is the only society devoted exclusively to Maritime Communications and Ham Radio, Lighthouses and Lightships

LEMO, established in 1946, specializes in high-performance interconnect solutions, offering an extensive range of over 50,000 circular connectors. Their product line includes the REDEL SP IP68 series, which features resin-free IP68 sealing for robust performance without complex potting processes. These connectors are critical for applications in medical, military, test and measurement, security, defense, and industrial sectors, ensuring reliable signal integrity in harsh conditions. The company designs, tests, and manufactures high-quality cable solutions, providing complete connectivity services such as custom cable assembly and signal integrity analysis. LEMO's solutions are integral to advanced scientific endeavors, as demonstrated by their use in CERN’s NA62 experiment for instrumentation and maintenance. LEMO's 80-year history, detailed in their anniversary publication, highlights their evolution from a Swiss family workshop to a global leader in connector technology. Their product finder tool assists customers in selecting appropriate connectors from their broad portfolio, which also serves audio-video, transportation, aerospace, and UAV applications.

After a year of preparation, 150 students and 11 professors participated in 10 hours of intense Contesting instruction covering some 22 topics, with over 400 pages of text

Keyclicks and NB modifications for the Yaesu FT-1000MP Mark-V HF transceiver

Hams or amateur radio operators and CB operators usually cannot have ideal grounds, but with some care and planning they can have nearly perfect systems

MBU Cluster is simple android application for ham radio operators to view live the spots on mobile device. All the spots are refreshing every 60 seconds.

The BTech DMR-6X2 dual-band DMR handheld radio is thoroughly reviewed, detailing its features and performance for amateur radio operators. This resource covers the radio's capabilities for both VHF and UHF frequencies, supporting Tier II DMR digital and FM analog modes. It highlights key specifications such as its **136-174 MHz** and **400-480 MHz** frequency ranges, CTCSS/DCS, DTMF, 2-TONE, and 5-TONE signaling, and its _digital simplex repeater_ function. The review provides a comprehensive unboxing experience, listing included accessories like two Li-Ion batteries (2100 and 3100 mAh), a programming cable, and a 37-page English user guide. It also specifies the radio's physical dimensions of 5.1 x 2.4 x 1.5 inches and weights of 9.9 oz with the 2100 mAh battery and 10.8 oz with the 3100 mAh battery, offering practical insights for hams considering this transceiver.

This dipole is composed by a coaxial structure and non-folded dipole made from two open conductive cylinders, and benefits from the stub compensation of a folded dipole by passing an insulated wire through the axis and connecting it to the ends of both limbs. By G4CQM

The C.A.R.E.N. Club is one of the oldest amateur radio clubs in Arkansas, dating back to the late 1950s. Just as the name implies, the C.A.R.E.N. Club is the state leader in emergency communications, SKYWARN, Amateur Radio Emergency Service (ARES), Radio Amateur Civil Emergency Service (RACES).

Wouxun KG-UV8D Standard Programming Software. Used to adjust or expand the frequency range to the full authorized range of the radio and not beyond. 134-174MHz 400-519MHz This software will Not add the 2.5kHz step.

An HF 10-20m portable RF power amplifier based on the RD16HHF1 FETS giving 25 W.

Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably

Receiver performance test of the Icom IC-7610 transceiver done by Rob Sherwood

Yaesu ATAS 120 Autotune Antenna Repair

Pileup simulator for for the existing and future DX-pedition operators, and for those who are curious how it feels to manage a pileup.

Saipan rental shack for the customer who enjoys amateur radio from Saipan

Kenwood TS-590S QST review comments and table comparison vs Elecraft K3

Pictures, details and specifications about Yaesu VX-170

Antennas are influenced by the effect of the ground and by the type of conductors from which they are constructed. Effects of various types of grounds on a 1.825 MHz horizontal 0.5 wave dipole

VP5X contest group website. VP5X is licensed to KY1V for contest operation from the Turks & Caicos Islands.

A custom manual for the Yaesu FT 450 owners, tha includes system controls, factory reset procedure, procedural uses, memory management, programming and many more

A 2m band Moxon antenna design is presented, centered at 145.2 MHz, with dimensions derived from Moxgen software. The design features a calculated 6 dBi gain, an 80-degree beamwidth, and an impressive 43 dB front-to-back ratio with minimal back lobes, concentrating RF energy in the forward direction. The antenna is balanced to 50 Ohms, facilitating direct feed. SWR sweep data from 144 MHz to 146 MHz demonstrates a near 1:1 SWR at the center frequency, maintaining healthy SWR values across the entire 2m amateur band. This performance is comparable to a 3-element Yagi, yet the Moxon offers advantages in compact size and ease of mast mounting, making it suitable for various operating environments.

Greetins from Gran Canaria, Canary Island, includes many information and video about digital modes, in spanish

Schemaric for a simple headset adaptor for some popular HTs by Kenwood, Baofeng and Wouxun by N1GY

This PDF File include the serial commands to program and control the TH-G71. Should work with TH-D7 series too

The station can be configured for either SO2R (single operator-two radios), M/S (multiple operators single radio), or M2 (multiple operators two radio) contest classifications.

The Orion II A9 Power Distribution Board Problem and Fix by N6IE

AO-51 Operating guidelines and introduction

A beginners guide to DMR. This web site cover all aspects of DMR and is a valuable resource for those who want to get started with DMR.

Commsaudit uk, i/q quadrature , hf receivers, rf, multicoupler, multicouplers, switch matrix, antenna matrices, masthead amplifier,, vhf receiver, uhf,

An on-line museum featuring over 400 pictures of radios and related items from the 1920's

This article was first published in CQ-TV issue 208. Author try to explain digital television in layman's terms and without getting too involved in mathematics.

Understand how high pass filters are done

A 200 Watt amplifier for 23 cm band

The CES Wireless Technologies website details a range of **GPS fleet tracking** solutions designed for mobile information systems. It highlights offerings such as dispatch and mapping software, Automatic Vehicle Location (AVL) systems, and mobile data display terminals. The platform also mentions support for Automatic Number Identification (ANI) and Continuous Tone-Coded Squelch System (CTCSS) functionalities, indicating integration with two-way radio communication protocols. Specific products include GPS tracking devices and associated software for fleet management, emphasizing features like real-time location monitoring and operational efficiency. The site positions itself as a manufacturer in this specialized domain, catering to commercial and public safety sectors requiring robust mobile data solutions. While the page title mentions "Ham Radio Directory" categories, the content primarily focuses on commercial GPS and fleet management technologies, not amateur radio applications. The listed products are geared towards professional mobile radio (PMR) environments rather than typical ham radio operations.

Homepage of the OS/2 and eComStation enabled Radio Amateurs, the HAM/2s. Reference site for OS/2 ham radio users,

A considerably shortened Magnetic Loop antenna with performance of a single conductor text book magnetic loop.

Horn Antennas theory and principles

The mid florida dx association was formed in february 2005. to promote friendship and cooperation among amateur radio (wireless) operators primarily

A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC Bands, it is designed for portability for field days, camping, or permanent installation, cost, and to achieve at least 1/2 wavelength on the WARC bands.

DIXPRS is an APRS Internet Gateway and Digipeater software for HAM radio use. It is designed to be portable and platform independent as much as possible. To reach this goal it is written in Python with minimal dependency considering older versions of operating systems and Python.

Build this noise reducing system to enhance audio of your speaker. A project by kg4jjh

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.

Common causes of failues, due to wrong clamps. About Guy Anchors

This home made antenna provides around 10.5dBd gain on 70cm, and 6.5dBd gain on 2m, which is more than adequate to work the FM satellites with a handheld dual band radio

Here you will be able to access all of the information regarding our amateur radio disaster relief communications organization, its divisions and volunteer members

A review of all possible receiving antennas for top band 160 meters

This article is about a 4 element yagi VHF antenna designed to be easy to be assembled and suited for portable operations

A Mailing list for Greek Radio Amateurs from all over the world.

The Yaesu FT-2000 on RigPix