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General
| File | Comments |
| Simple helical antennas | This calculator permits designing (or analysing) helical antennas, and produces acceptable results for versions of 3 to more than 30 turns. It suggests a matching section, and gives all mechanical data, including -1dB and -3dB bandwidth, and -3dB beamwidth. |
| Quadrifilar helical antenna | Design your own QFH (or QHA) antenna. Many people have reported good to excellent results. Practical precision has been checked from 100 MHz to over 2 GHz! The calculator also generates a PDF drill pattern to ease construction. |
| Balloon utilities |
* Convert pressure/altitude/temperature/density according to the
'standard atmosphere'. * Calculate descent time and speed for a parachute, given diameter, weight and height. |
| (c) John Coppens ON6JC/LW3HAZ |