RF Design and Amateur Radio Related Programs
These programs are distributed in the hope that they will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
Most are made available under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or (at your option) any
later version, but see the License conditions for each individual program.
Almost all of these programs are in the form of Yahoo! Widgets
which require installation of the Yahoo! (Konfabulator) Widget Engine.
They are packaged as zipped Widgets (with extension .widget) inside a zipped folder. The
code can be examined by unzipping the .widget files.
A Portuguese translation of this page by Artur Weber and Adelina Domingos can be found
A Hindi translation of this page by Nathan Zed can be found
RF Design Widgets
- NetCalc - an RF Impedance Calculator (Downloads: 23,979)
NetCalc is broadly based on the
program NETCALC by Ian White. NETCALC was
described by Ian as a simple impedance calculator for working out Radio
Frequency network design ideas.
This Yahoo! Widget can be used on Windows and on older version of macOS (before 10.11 El Capitan).
You may also use the new web version
or download the files for local use in your browser.
- TLC - Transmission Line Calculator
This is a special purpose calculator which performs transmission line
calculations. Various geometries are possible with the hot and cold conductors
having elliptic or rectangular shapes. The Widget calculates the line
characteristics and displays the voltage field.
Amateur Radio Related Widgets
- AC 3-Phase Calculator
This is a special purpose calculator which performs simple 3-phase alternating
current calculations. Given three of the four quantities voltage, current, power
factor and power, the Widget calculates the value of the fourth. Two formulae
are used, one for line voltages and currents, the other for phase voltages and
- Attenuator (Downloads: 8,525)
Attenuator is a special purpose calculator for the design of passive resistive attenuators
and impedance matching circuits.
The Widget can assist in the design of PI-network, T-network, BT-network, B-network
and L-network attenuators and impedance matching circuits.
It can perform single calculations and (in symmetric cases) generate tables for later use.
- Coil Inductance
This is a special purpose calculator which calculates the properties of a single-layer
air-spaced coil. Given three parameters, the Widget calculates the value of a fourth.
- Morse Key
This is a Morse code practice program. The sending speed is user settable (Farnsworth
method) between 5 and 20 wpm. Text files and texts can be dragged onto the main window and
are sent after a two second delay. There are ten user settable "standard" texts which are
sent by pressing a hotkey. The keyboard can be used to send Morse code. The Widget
displays the characters (but not the Morse patterns) as they are sent.
- Ohm's Law Calculator
This is a special purpose calculator which performs simple calculations using
Ohm's Law. Given any two of the four quantities - voltage, current, resistance
or power - the Widget calculates the values of the other two.
The Resistors Widget is a special purpose calculator which can be used to decode
the colored bands on resistors (and some small capacitors).
- Tx Line Calculator
This is a special purpose calculator which performs simple transmission line
calculations. Given three line parameters, the Widget calculates the value of a
fourth. Two formulae are used, one for coaxial cable, the other for parallel
(My) Yahoo! Widgets
This is a collection of Widgets which were designed and made by me or to which I made a contribution.
- (My) Yahoo! Widgets
- CRC32 Checksum Calculator
- CRC-CCITT-16 Checksum Calculator
- CRC16 Checksum Calculator
- NMEA to RS232 Interface Board
- NetCalc Impedance Chart (PDF)
- Resonant Circuit Nomogram (1-10MHz) (PDF)
- Resonant Circuit Nomogram (100kHz-10MHz) (PDF)
Tuesday, November 27, 2018.