# HamCalc¶

I wrote a Ham-Radio Calculator.

This is an interesting piece of Java because it uses a simple Model-View-Control (MVC) framework for a variety of calculations.

First, the presentation is based on Observer-Observable relationship. Each model is an Observable and an Observer of other models. A change in one can trickle through to others.

Second, the models are stateful, and remember which values where set. When *n*-1 of
the required *n* parameter have been supplied, it calculates the remaining parameter.
By changing the order of entry, you can force it to solve for any parameter.

## Implementation Notes¶

Also, note that the hamcalc site (as a whole) is static HTML, GIF’s and applet code.

The pages are built from a template by a Python tool that makes use of Docutils, Jinja2 and a customized applet directive to extended the Restructured Text markup.

## Extensions¶

First, finish all the various calculators.

Second, fold in metric in addition to English units.