Even better VHF solar powered pulsing radio beacon

3,322 views · Published 30 October 2016 · 1:24 · Indexed 22 October 2026

Channel: Amateur Radio VK3YE · 2016 · Science & Technology

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A refined VHF solar powered pulsing radio beacon.  Uses a 2 transistor multivibrator 400 Hz audio oscillator pulsed by a flashing LED.  This modulates a one transistor milliwatt VHF transmitter.  The coil in the RF transistor's collector is 9 turns of tinned copper wire 6mm diameter and spread out to about 10mm.  When light is low the pulsing is just CW but becomes modulated CW when it's brighter. 

VK6FH circuit http://www.vk6fh.com/vk6fh/simple%20radio%20beacon%20mod.htm

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