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This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors

Review by G3TXQ and comparison to its modificated versions. SWR Measurements on inverted V setup and comparison from EZNEC model and a real one.

The website offers a comprehensive guide on high-frequency (HF) skywave propagation for amateur radio operators. It explains HF radio propagation fundamentals, including electromagnetic wave properties, HF bands, and propagation modes like skywave, ground wave, and line-of-sight. The site focuses on the ionosphere's critical role, influenced by solar activity, in refracting HF waves for long-distance communication. Real-time monitoring tools such as DX clusters, beacons, and digital modes like FT8 assist users in tracking band activity and propagation conditions globally. Forecasting methods are detailed, highlighting scientific insights into solar-terrestrial interactions and ionospheric variability. The guide also covers advanced topics like NVIS and gray line propagation, ionosonde data, and propagation prediction models, making it a valuable resource for ham radio enthusiasts aiming to optimize communications

Qsl Information databse updated the 1st of the month. Over 130,000 managers and direct addresses

Info about Yaesu VX-8R by APRS Wiki

Kevin KD5WX maintains this site daily and are called by the NHC to activate the net, concurrent with the HF watch nets. Activated during Hurricane season only.

The Grit Net website

Yaesu FT-100 radio control software for linux

A 4 element delta quad antenna for 15 meters in french

The Nato and Western Union Phonetic Alphabets useful for spelling words and names over the phone.

Some beginners guide to monitoring aircraft communications

SARA is a dedicated group of people that formed an international society to learn, trade technical information and do their own observations of the radio sky

glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes

This program lets you cross connect Telnet connections and ComPorts or Ethernet. It can be used as a backup connection for PacketCluster nodes or to connect a CT network to a remote PacketCluster.

Amateur Radio (G3TXQ) - Malta 40 QRP CW Transceiver

A simple & effective antenna pre-amp for 10m. Band (28-29.7 MHz)

How to homebrew a ENVIS antenna for 80 and 40 meters band

Power supplies, rf power amplifiers, dummy loads, frequency counters, repeaters antennas manufacturer based in Italy

BaseStation is a Windows application written originally for the SBS-1 family of Virtual Radar Receivers.

Schematic of a regulated 0-24v 2A Power Supply

Yaesu FT-847 (FT 847 FT847) transceivers mods reviews software manuals and diagrams

An Eprom Eraser with UV-Ray for 27Cxx Eprom (and similar, common in TNC) with a timer

Increase TS 480 PEP power level

Serving Tarrant, Parker, Wise counties, and city of Fort Worth, Azle, Springtown, Boyd, Weatherford, Saginaw

NetDXCluster provides ham radio operators access to AR DX Cluster nodes using telnet via the Internet. Internet connection is required. This software only works under Mac OS X 10.1.3 or later.

Huge amount of relevant information you should know before building a tower

A long wire balun by ON6MU

Based on original G2BCX design this J-Pole antenna for the six meter band is made with a homemade ribbon cable. The antenna shown in this article includes a coaxial cable choke feed to remove RF currents from flowing on the outer of the cable.

This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

This experiment was inspired by Peter VK2TPM's receiving loop experiments for 80 metres.

A new weak signal DX mode for Radio Amateurs, employing M-ary FSK, phase continous tones and convolutional coded FEC.

Western Australia frequencies

Official Icom comparison chart for IC 756 PRO III, IC-7600, IC-7700 and IC-7800

We are a group of Amateur Radio Operators who travel around the country in Recreational Vehicles and host radio nets to keep in touch with one another

A simple TRAP-dipole project for 20 and 40m bands includes EZNec simulations

This program has been designed for packet communication with ISS (International Space Station), PCSat or 'compatible' satellites with ease... Ideal for any UI packet communication.

A triband VHF Yagi antenna for 6 m, 4 m and 2 m with one feed-point by DK7ZB

Windows open source packet radio decoder. Decodes AFSK1200, AFSK2400, HAPN4800, and FSK9600 packet data with a radio connected to your pc sound device.

Generic PI4 + CW + Carrier Arduino Beacon Controller with interfacing to Analog Devices AD9833 DDS AD9850 DDS, AD9851 DDS, AD9912 DDS , AD9913 DDS, ADF4350 and ADF4351 synthesizers, ADF5355 synthesizer, ADF5356 synthesizer, Radio modulated by an audio soft-DDS Reverse DDS, RDDS microwave unit, Silicon Labs Si5351A programmable clock generator, Silicon Labs Si570 programmable XO/VCXO, Texas Instruments LMX2541 synthesizer

A shortened 20m vertical antenna design made with 4Nec2

NetLogger is a logging program that can use the internet to transmit check-in information to other users of NetLogger. Net participants that are monitoring the net with NetLogger receive updated information every twenty seconds.

Two types of multi-functional Home-brew 6/8Amps - 20 Ampere variable power supplies by ON6MU

The Old Tube Radio Network is dedicated to those real, American-Made, Old Tube CB Radios

Robert Norgards KL7FM's, notes on upgrading the Heathkit SB-200

Circuit diagrams drake tr7, Schaltbilder Drake Tr7, antenna tuners, baluns, and home brew power supplies, dual tone ssb test generator, zweiton ssb test generator, zweiton testgenerator, dual tone test generator by DK4DDS

Grig is a simple Ham Radio control (CAT) program based on the Ham Radio Control Libraries (Hamlib). It is intended to be highly generic presenting the user to the same graphical user interface regardless of which radio is being controlled.

IK0WRB CW Keyer using a PIC 16F84

A super-fast PSK mode for RTTY Contesting, 100 wpm character transmission speed for contest exchanges and macro transmission versus RTTY at 60 wpm

By Alfred T Yerger II WA2EHI, in this PDF file explain how to remote your rig via the internet by using HRD Ham Radio Deluxe and skype

The document provides a detailed guide on modifying an inverted-L antenna to include the 160 meters band. This enhancement allows amateur radio operators to utilize the lower frequency effectively, which is crucial for long-distance communication, especially during the night. The inverted-L design is popular due to its compact size and ease of installation, making it suitable for various environments. By adding top band capabilities, operators can engage in DXing and contesting on 160m, expanding their operational range and opportunities. The guide includes practical tips and considerations for construction, ensuring that the antenna maintains its performance across the extended frequency range. It discusses the necessary adjustments and materials required for the modification, along with potential challenges and solutions. Whether you are a seasoned operator or a beginner, this project can enhance your station's capabilities, allowing for more versatile operations and improved signal quality on the 160m band.