The 15m/80m beacon PA1W/B

If switched on this beacon will operate at 21,388.4KHz or 3,579.1kHz.

Pictures here.

The beacons at 21.3884MHz/3.5756MHz are only switched on temporarily via remote control using a Raspberry Pi.
Sends - vvvvv de PA1W/B beacon jo21rj 350mW -
Antenna is often a vertical 10m j-ant matched to 15 m and a Windom for 80m.
Principle 15m: xtal osc. at 10.695MHz with doubler filter, amp. with bandfilter, 1W amplifier with keying circuit, harmonic filter. 1W is only delivered if the voltage is 14V. At 12V the output power is 320mW and 200mW a bit below 12V. Transistor is not running hot at these low power values.
Principle 80m: Just a Pixie2 with extra amplifier (IRF630) and harmonic filter. Will be used when I am on holiday to tune the antenna and to check 15m/80m propagation to the Netherlands. If the band is very quiet only. I experienced a quiet band even during openings. These beacons are used very rarely.
Python code used on the Raspberry Pi.


Websdr Twente reception of PA1W/B at 80mtrs

Websdr in Sweden reception of PA1W/B at 80mtrs

Websdr in Estonia reception of PA1W/B at 80mtrs

Websdr in Austria reception of PA1W/B at 80mtrs





Reception of the 80m beacon at a distance of 53km (Groesbeek at night).




Reception of the 80m beacon at a distance of 53km (Groesbeek during daylight)