simple calculator circui

A 5 element beam for 10 meter band - Here is a very simple 5 element covering the entire 10 meter band (28.000-29.700) with a swr of less than 1.4 at the band edges

Morgain Antenna for 40/80 - Simple and cheap antenna for 40/80 meter band

N3DNO's Antenna calculator - A 3 element yagi antenna calculator that uses javascript by N3DNO

KC0TKS Antenna Calculators - Allow calculation of a dipole, 3 element yagi and a vertical antenna

Remote Control Antenna Switch - The Remote Control Antenna Switch consists of two circuit boards. The control unit and the remotely controlled switch

Log Periodic Antenna Design  ^pop - calculates the dimensions and spacings of the elements needed to build a log periodic antenna, given tao, sigma and the lower and upper cutoff frequencies.

Simple Dipole Antenna for 2m - A simple portable dipole antenna for 144MHz

Quad antenna calculator  ^updated - To get the dimensions for your quad, all you have to do is type in the center frequency of the range where you talk, or the frequency you use most and then click the Calculate button.

Getting the most from your tuner - Here is how to adjust this popular tuner circuit so it transfers maximum power to your antenna without going snap

DXCal DX Calendar - This is DXCal - a DX Calendar. The idea is quite simple, DXCal is a calendar where hams can adds all the DX events that are planned.

ARDF transmitter for 80 meters - The 80m TX described here is the well known ON7YD ATX-80 and timer, combined and re-engineered to fit a readily available enclosure by G3ZOI

Coax Cable loss and SWR calculator - This small window application will calculate Coax Cable loss from SWR and SWR from Cable Loss

JavaScript Electronic Notebook, K7MEM - It consists of a group of JavaScript® driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. Offer calculators for Resistors, capacitors, inductors, power supplies, filters, attenuators and antennas

MacTNC - MacTNC is simple, configurable terminal software used by amateur (ham) radio operators to control a TNC (terminal node controller). MacTNC performs most of the same functions of other terminal software, but includes buttons for standard commands, and allows the user to configure additional buttons for special purposes. MacTNC works only user Mac OS X because it relies on Unix components of the current operating system.

Ham Radio Reference (HRR) - A collection of calculators, contest schedules, references, databases and more for Palm OS by KB7AVT

HAMCALC - The function that is actually implemented is a QRB and QTF calculator, but the idea is to make a complete toolkit with DXCC database, logging and so on.

GOLog Contest Logger for Palm OS - GOLog is a contest logger for Palm OS and was written with the QRP field contester in mind. GOLog is small (about 48K) and simple and should run on any handheld computer running Palm OS version 3.0 or newer.

IC746 control - IC-746 control It’s as simple as point and click. Left click will turn counter clockwise, and right click will turn clockwise.

Callsign Lookup - Callsign Lookup is a simple, small Apple Macintosh application that allows the amateur radio operator with a dedicated Internet connection (DSL, cable) to quickly access online callsign databases

Negative feedback output circuit - Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

A simple VOX circuit - Here is a 3 transistors 6 diodes circuit that is a Voice Operated Tx PTT control as well as an ANTI VOX circuit to stop mis-operation from Rx noise by G8MNY

Morse Code Beacon Keyer - This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter.

Homebrew FT 817 Headset - A simple circuit to homebrew your own headset for the Yaesu FT-817

CW Filter - I0QM Gaussian CW Filter page This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993

A regenerative receiver with 6SN7GT - Circuit to build a regenerative receiver