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KA9LXP's HF antenna mast page

Basic of shortwave antennas

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

Ham Radio Class On-Line. A complete On-Line Course for the Technician, General or Extra Class amateur radio license.

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

An easy portable VHF antenna to build for ARES - RACES work is the 300 Ohm Twin Lead JPole antenna

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

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

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

Issue 35, October 1992 Six News

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

This page describes a fix to the Low Pass Filter that provides more filtering of the second harmonic of 144-148 MHz.

Shortwave frequency list and swl links

Part 2 You're now much closer to saying goodbye to your unwanted signal problems!

A Useful Horizontally Polarised Omni-directional Antenna with Gain for 144 MHz

60KHz to 60MHz. laboratory quality Vector Network Analyzer project

This article describes the characteristics of the Windom antenna and shows the results of several simulations made with MMANA-GAL, covering models optimized for the 20 m, 40 m and 80 m bands.

The society representing the interests of Amateur Radio in Northern Peninsular Malaysia

A very basic guide to antennas concept. Explain the usage of dummy load, basic antennas like dipole o j-poles.

2 Meter Indoor Slim Jim Antennas for Cyclone Season and Other Uses by VK4MDX

Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM

Provider of point-to-point microwave radio system sales, service, and integration, employing refurbished name brand digital (DS1/E1, DS3/E3) and analog video radios. Specializing in Microwave Associates (M/A-COM) , Digital Microwave Corp. (DMC/Stratex) and Alcatel/Rockwell microwave radios.

Home of the NERG amateur radio club located in Melbourne, Victoria, Australia

The Super Check Partial database files provide a list of callsigns used by active contesters. The data comes from Cabrillo logs contributed by contesters themselves. Contributed logs from the past 24 months are used to create the database. These logs are combined and filtered so that they result in a fairly good (but not perfect) list. The files do not contain any QSO data, such as state, CQ zone, Maidenhead Grid Locator, etc. The dta files can be used with CT, WriteLog, TRlog, SD, N1MM Logger, NA, Win-Test, and others

DigChip is a provider of integrated circuits documentation search engine, it's also distributor agent between buyers and distributors excess inventory stock.

Amateur radio-telescope project of a retired seafarer.

The Resonant Feedline Dipole (RFD) HF antenna design utilizes a single piece of coaxial cable and a stranded wire section, forming a 1/4-wavelength radiator. This configuration, based on a 1997 ARRL Handbook design (page 20.17), functions by RF traveling on the inside of the coax shield and returning on the outside, creating the second half of the dipole. A choke wound into the feedline prevents RF current from flowing back down the feedline. Construction details include using RG-58a/u coax for a 75m version, with a 1/4-wavelength section of stranded wire soldered to the center conductor. The document provides choke dimensions for RG-213, RG-8, and RG-58 coax across 3.5 MHz to 28 MHz, specifying cable length and number of turns. Dipole dimensions are also tabulated for frequencies from 3.6 MHz to 28.4 MHz, listing overall length and individual leg lengths. Field tests included deployment near Bryson City at 5 feet off the ground and as a sloper during WCARS Field Day in Asheville, yielding successful local and regional contacts.

The basics of what is a discone antenna for wide band or bandwidth omnidirectional applications.

Win92 - windows-based data management for the pro-92/2067 trunking scanner

Where to look on the Bands for SSTV

ARRL article on random wire antenna, simple antennas that can be tuned for every band, excellent solution for field day operations

Analysis of an antenna trap where a coil is formed of a length of coax cable, the outer conductor of one coax end is tied to the inner conductor of the other coax end, and the remaining connections form the terminals for the trap.

Clackamas County KD7ZDO Amateur Radio Emergency Service Radio Amateur Civil Emergency Service

W3EDP antenna assembly instructions and dimensions with pictures in this PDF File

RFAC Solutions specializes in providing a range of RF components, including various connector types, cable assemblies, attenuators, and filters. Their product line features common connector standards such as SMA, BNC, TNC, N-Type, MCX, and MMCX, essential for reliable RF signal paths in amateur radio and commercial applications. The company also offers high-power VHF amplifiers, catering to needs for signal boosting in specific frequency ranges. Their offerings extend to dust caps and adapters, which are crucial for maintaining the integrity and versatility of RF systems. The focus on supplying components from South Korea suggests a commitment to specific manufacturing standards and supply chain practices. This resource details a vendor's product scope, useful for hams sourcing specific parts for shack builds or antenna projects. Jeff is listed as a contact for inquiries.

The International DX Association is an amateur radio organization dedicated to working DX and making DX possible. Promotes and supports DX operations in countries that have limited or no amateur radio activity. Support is usually to DXpeditions to rare DXCC entities. Provides DX news and QSL routes on 14.236 MHz at 2330z.

Radio frequency systems require robust protection against transient voltage events, which can severely damage sensitive equipment. This resource details a range of **RF surge protection** devices, including models with DC Pass, DC Block, Bias T, and Ultra Low PIM characteristics, designed to safeguard critical infrastructure. It also presents various RF filtering solutions and interconnect components, emphasizing their role in maintaining signal integrity and operational continuity across diverse applications. The site provides information on products engineered for both RF and data line protection, highlighting their utility in preventing downtime and equipment loss. Specific product categories encompass coaxial protectors, grounding items, and fiber optic solutions, indicating a broad scope of application from amateur radio installations to industrial and telecommunications networks. Furthermore, the resource mentions the availability of NOM-certified products and offers same-day shipping for many items, underscoring a commitment to rapid deployment and compliance with industry standards.

Industrial Communication Engineers (ICE) was a manufacturer specializing in **RF components** and solutions for amateur radio and commercial applications. Their product line included a range of RF parts, various types of filters, and RF switching products designed to enhance station performance and mitigate interference. These components were critical for hams engaged in contesting, DXing, or general operating, providing means to improve signal integrity and manage complex antenna systems. The company's offerings addressed common operational challenges such as RFI and TVI, with products like **low pass filters** and antenna filters. While the specific technical specifications of their product range are no longer available, such components typically provided significant attenuation of unwanted harmonics and out-of-band emissions, crucial for maintaining a clean signal and preventing interference with other electronic devices. The current status indicates the domain is for sale, suggesting the manufacturing operations have ceased.

An interesting project of the popular IW3HEV antenna analyzer in and embedded solution by PA3CKR.

Open source software designed for the ICOM IC-R5 receiver. Linux, MacOS X and Windows

Promoting interest in DX to the state of Arkansas and the world.

WRAASE Slow-Scan-Television (SSTV) commercial windows software, need an external hardware, SC-4 to work.

Homebrew a 2 meter square dipole antenna

An off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m by M0UKD

Modification to connect a frequency counter to a MFJ-9406 50 MHz transceiver by ON6MU

Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

Electronic communication museum Bloomfield, NY USA

A project of a 5 Antennas Relay Switch Box, all Switches & Relays have both contacts wired in parallel to improve reliability of operation, to prevent static build up, when an antenna is not in use the feeder coax is grounded.

17-Element Very High Frequency/Ultra High Frequency Log Period Dipole Array

In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles