Elecraft K3S and Heathkit SB-200 hookup advice

Discussion in 'Amateur Radio Amplifiers' started by N8MDC, May 8, 2021.

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  1. W1QJ

    W1QJ Ham Member QRZ Page

    You specifically said +200 volts. I’m saying it’s a minus voltage that’s all.
  2. K2XT

    K2XT Premium Subscriber QRZ Page

    I was just quoting the manual. Let me get right on this. We can't let this issue hang. The whole ham radio world is waiting.
  3. K2XT

    K2XT Premium Subscriber QRZ Page

    My goof in assuming the K3 key out was a relay contact. It actually uses an IRF1630 FET to key the key out line.
  4. KD2ACO

    KD2ACO Platinum Subscriber Platinum Subscriber Life Member QRZ Page

    Well, that FET would blow its top! :p
  5. W4HWD

    W4HWD Premium Subscriber QRZ Page

    You could also call Elecraft and ask them.

    That would be preferable to messing up something in a rig that can't be replaced cos it's out of production.
  6. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    I'd use the ARB interface here; or better still, if one doesn't mind the slight additional delay, just add a small 12Vdc relay inside the amp whose coil is powered by a voltage doubler from the filament circuit and whose contacts key the original relay and make the amp "universal" so it can be used with any kind of transceiver and without the external interface.:)
  7. K2XT

    K2XT Premium Subscriber QRZ Page

    OP said he has it working. Presumably with the Ameritron interface unit.

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