Скачать или смотреть Testing a 1.5 volt / 1 transistor pulsed VHF beacon

Possibly the simplest possible pulsed beacon transmitter. Video describes where I got the circuit from, modifications to make it light dependent and complications along the way. I then do a range test on a local beach and get a surprising distance for a 1 transistor circuit powered by 1 x AA battery.

The beacon operates just below 37 MHz using a commonly available 36.864 MHz crystal. In Australia frequencies around this are allocated to 'low interference potential devices' with a 100mW EIRP power limit. This transmitter would have an output of a few milliwatts only.

Contents
0:00 Introduction
0:23 Circuit of previous 2 transistor beacon
1:06 Inspiration for this project
1:29 My unit and description
2:05 Circuit of 1 transistor beacon and description
3:07 Important components
3:53 Outside range test - How far?
5:02 Summary and applications
5:22 Hand-carried QRP Antennas (book)

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