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Collection of modifications notes for the Kenwood TS850

Why 6 meter hams design the best antennas

A Mini Moxon antenna for 40 meters band project in a well done PDF document

What is ground?RF ground and the ground plane, how can I tell if I have a good ground? ground loops

Outlines recommended operating procedures for amateur radio repeaters, detailing best practices for general on-air conduct. It emphasizes using simplex when possible, monitoring the frequency before transmitting, and maintaining concise, thoughtful transmissions to avoid monopolizing the repeater. The resource also stresses the importance of legal identification, such as the Canadian requirement at the beginning and end of a contact and every thirty minutes of operation. Furthermore, the article provides specific instructions for **autopatch** operation, including access codes and the necessity of brief calls, while cautioning against misuse for long-distance calls or commercial purposes. It highlights the financial support expected from regular users to maintain repeater infrastructure. Finally, the guide differentiates between permanently linked repeaters, which offer extended coverage, and **code access linked repeaters**, explaining the sequence of identification and code entry required to establish and terminate links for broader communication.

The MFJ-940 VERSA TUNER II is a useful little antenna tuner for the HF-bands. However it suffers from a minor design error, which can be easily rectified.

Stream your radio audio output with free version on unreal media server. Support live audio and video broadcasting via internet

D3+ High Performance Antennas for Field Day. This article describes versatile broadband wire antennas. These antennas will double your effective radiated power over a dipole, will be easy and inexpensive to build and install, and will be simple to match.

About numbers stations, and their criptic transmissions, where to listen to them and some audio recording samples by fascinating shortwaves

KB1GW's collection of beverage antenna information

Simple, inexpensive and lots of fun! Here is an easy to make home brew antenna that can get you on the air working satellites or be built for use as a portable hand held antenna to extend the range of your HT.

The Grid Yagi (or Grid Quad) is a high performance yagi antenna that can be built with readily obtainable inexpensive materials. Described here is a 6 element 2 meter version with a boom length of about 1 wavelength, shown

Feeding a G5RV Overview by VK1OD

A project for a multiband HF windom antenna by VE2CV and VE3KLO

Map of italy with amateur radio prefixes and grid squares

Onine Log for 9J2T DX Pedition

Satellite Tracking/Orbital Prediction Program an open-source, multi-user satellite tracking and orbital prediction program written under the Linux operating system by John A. Magliacane, KD2BD. PREDICT is free software

Long Waves, Short Antennas, designing antennas for MF and LF communications

GitHub reposotory of QradioPredict, a radio propagation prediction tool for VHF-UHF, based on the Irregular Terrain Model, also known as Longley-Rice. Can be used as a repeater site planing tool. Has an internal APRS client which can be used to display stations as a landmark.

An 87ft inverted L portable antenna working on 80 40 30 20 15 meters band

This is from a posting on the BARK PBBS Keith, WB2VUO

Proppy: Online HF propagation predictions using the ITU Recommendation P.533-13 Propagation Prediction Application.

The half wave dipole antenna is a simple and practical antenna model that consists of a half wavelength long centre fed conductor.

K9AY receiving antennas for PA6Z made by PA9M

An homebrew crossed Yagi antenna for two meters band based on DK72B design with pictures, detailed description and tricks by Barry Zarucki M0DGQ

Definition of antenna gain at wikipedia

IC-2720H modifications and links to manuals

Active filter design software for windows, AktivFilter 3 for the design of active filters tuned on the opamp type.

A vertical dipole for 10, 15, 20 and 40 meters made adapting two Hustler Model 6-BTV antennas by w6sdo

The ICOM 746-Pro has acquired a history of NEC 1678G (IC-151) MMIC and driver transistor 2SK2975 failures. The failure of IC-151 appears to be a combination of ESD damage from electrostatic charge on the antenna entering IC-151, and perhaps thermal heat.

A restored version of the original CQ DX Zones of the world

Yet another G5RV antenna plan to build a G5RV Antenna for 80 to 10 meters usage

A copper pipe Hentenna for 144 MHz. The Hentenna, a compact, high-gain loop antenna developed in Japan in the 1970s, offers approximately 5.1 dBd gain, comparable to a three-element Yagi. Adapted for 2 meters, it is crafted from copper pipe for simplicity, affordability, and broadband performance. Requiring no feed-point tuning, its construction involves soldering standard copper fittings. Installation demands non-conductive materials to minimize signal disruption. Versatile for vertical or horizontal polarization, it is ideal for FM, repeater, SSB, or CW applications. This design emphasizes practicality and performance for amateur radio enthusiasts

Project plan for a 4 element yagi beam for 50 Mhz

Recordings of shortwave numbers stations

Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA

Freeware windows program by VE3NEA that allow to view and edit the Master Callsign Database file used in many contesting programs, import and export callsigns, auto-download announced DX operations.

The sun can power your Ham station and a whole lot more. Using solar power panel with a 12 volt battery can permit you to operate autonomously even for several hours without interruption.

A 2,4 GHz 13cm band quadrible qiad antenna with reflector offering a 14dbd gain

HX-B5i five band HexBeam installation

Mods and informations about yaesu VX-5R

An easy method for erecting antenna masts using readily available material

List of latest published Weather Fax world wide schedule including frequencies and modes.

YO Yagi Optimizer by K6STI is an old MSDOS based antenna modelling software that has been very popular among ham radio community. YO.exe is still today used to optimize Yagi Antennas.

There is considerable confusion as to what exactly a multiband vertical antenna is. The confusion concerns the method of feed, how much mismatch one can expect, how many radials are required, how the particular antenna is built for multiband use, plus some other points.

Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.

A vertical portable antenna system by W0SJS that will work on 40, 30, 20, 17 and 15 meters

A very short dipole with a good radiation efficiently plus a respectable bandwidth by S. C. Chuck Smith, WA7RAI

A monoband J pole antenna dimensions sheet by N6JSX

A 160 meter antenna with a base loading coil used to tune the two lower frequency segments of the band.