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Thread: Do I Really Need It?

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  1. #1
    Join Date
    Jan 2013
    Anderson, CA

    Default Do I Really Need It?

    I am waiting for my Ameritron AL-811H to arrive to use with my Yaesu FT-900AT. According to the Ameritron ads, I need an Amplifier to Transceiver
    Interface (Model ARB-704) to save my transceiver from, 1) too much relay control voltage, 2) voltage spikes, 3) excessive relay current. $60. for the interface, plus about $20. for the correct cables is not that much. I don't want to wreck my Yaesu, so $80. is cheap insurance. BUT, DO I REALLY NEED IT? All ideas considered!!!!!

    Dennis KA6YGR

  2. #2
    Join Date
    Aug 2009
    Phoenix, AZ


    Dennis, I do not really know if you need one or not. If you decide you do need one, I will sell you the one I used on my ALS-600 before I sold it and upgraded to Elecraft KPA500, is in FB shape. Send me a PM if you want it, it will be a lot cheaper shipped than cost of new.
    73 de KK7EL Bruce

  3. #3
    Join Date
    Dec 2001


    I have had my AL-80A connected to 3 HF rigs, with no interface unit between the rigs and amplifier. No problems. I don't know too many who are using those amps with a keying interface in line.

    But if it makes you feel better than go ahead and buy one, or buy the used one being offered to you.

  4. #4


    I just checked both, and no external interface is needed or desired with the FT-900 and AL-811H.

    Just a waste of more stuff.

    When Ameritron recommends the ARB-704 or whatever, that's a "general" recommendation in case a user wants to connect a modern rig to an older amplifier that uses either higher voltage or higher current keying. The AL-811H doesn't; it's 12Vdc at 100 mA, and the FT-900 can key that just fine all by itself.

    I'd double my money by folding it in half and putting it back in my pocket.
    A government which robs Peter to pay Paul can always depend on the support of Paul.

    -- George Bernard Shaw

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