I got my amateur radio license (as SM0YSR) in January 2004, and since then I have occasionally active on the shortwave CW bands. My primary interest in amateur radio is building things, some projects are destribed on this page.
| Project | Year | Description |
|---|---|---|
| Trensceiver | 2006 | Probably the simplest transceiver out there, with only three (Swedish: tre) components. The schematic contains a crystal, a resistor and a JFET transistor connected to an earphone. By varying the input voltage, you can use it as a regenerative receiver or a CW transmitter. |
| Baking soda powered radio | 2005 | A small regenerative receiver powered by baking soda, steel wire and some coins. |
| Spark gap transmitter | 2004 | I built a simple spark gap transmitter with a small transformer (using a power MOSFET to drive it from a 9V battery) and a Cockroft ladder to generate the spark voltage. |
| 80m direct conversion transceiver | 2004 | This is my only major radio construction/design project, and not a terribly good one. It works pretty fine, though, and I even got on the cover of the Swedish QTC magazine with it. |
| My Pixie2 tranceivers | 2004 | The Pixie2 is a very small, simple and cheap low-power CW transceiver for the shortwave bands (mine use 3.58 MHz crystals). |
