Electronics

Some pictures from the recent Winterfest HAM radio meeting.

A semi-finalised implementation of the passive air-band receiver and field testing while I was travelling in the US.

I get oddly low results when attempting to measure the speed of sound in Water and Aluminium.

An experimental solid-state Fremodyne AM/FM Receiver for VHF.

A short video of the daring helicopter rescue I awoken to this morning.

My quick go at estimating the size of the International Space Station and Space Shuttle Orbiter from the wonderful Thierry Legault solar transit photograph.

More compatible receivers and a few circuits related to the system.

The guts of an AFL Sports Ears receiver, what you get for your money and how to build or buy your own compatible receiver for significantly less.

A tuned loop antenna with an active push-pull buffer featuring phantom powering via the coax feed.

Measurement of the half-life of Technetium-99m.

I build a variant of Roger G3XBM's latest experimental transceiver, the XBM80-2.

Adventures in measuring the selectivity of MCU-controlled super-regenerative quartz crystal controlled receivers. Resulting in a very useful selective log power meter.

A RF power measuring head using the AD8307.

A low-speed data link implemented using Pierce quartz crystal oscillators controlled by a microcontroller.

Arcing fault destroys the Rope Light controller.

A web-based emulator for the 240 LED Christmas Tree project.

I put together a USB ISP programmer for use with my Win32 laptop.