Pirate Amplitude Modulated Transmitter 1600KHz – 1800KHz with PL509 PL519 40KG6 EL519 6KG6

Pirate radio AM transmitter with PF86 in oscillator,  PCF80 in cathode follower and driver, PL 36 in driver and PL 509 / PL 519 in output stage. This transmitter is completely done without transformers. Only one transformer is used for modulation. In this version I used about 850 V in PL 509 plate. Finally I made 1500V power supply .It’s amplitude modulated on second grid of PL 509. I used stabilized power supply for G2, to avoid “vibrations” and to achieve better modulation quality. G2 voltage can be very fine regulated, so you can adjust power very close to max dissipation limits.

With this pirate radio transmitter and revised receiver RR230 with preselector, I spent a lot of time in the period from 1989 until 1992. I used 83 meters long longwire antenna at height of approximately 20 meters. As modulator I used an amplifier with two EL84 (6BQ5) in a push-pull connection, ECC83 (12AX7) as cathodyne phase inverter, EF86 (6267) as line preamp and ECC81 (12AT7) as microphone preamp in connection with amplitude limiter.

My call sign in that period was Columbia, Pancevo, 73 to all people I talked to!!!

2 thoughts on “Pirate Amplitude Modulated Transmitter 1600KHz – 1800KHz with PL509 PL519 40KG6 EL519 6KG6

  1. Per

    Nice to know someone else used the PL519 as PA for transmitters.

    Maybe we have talked sometime, but I don’t remember.

    73
    Call sign : Nummer 05

    Reply

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