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Dentron Clipperton L

Discussion in 'Amateur Radio Amplifiers' started by KN4VCT, Aug 14, 2019.

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  1. W9GB

    W9GB Ham Member QRZ Page

    DENTRON HF Amplifier Tuned Input Board : Oct. 15, 2006
    Jim Pickett, K5LAD GLA-1000/Dentron Tuned Input.htm
    Dentron Documents Tuned
    Dentron CM-1 document (PDF) is attached.

    Check with Carl, K1MH and Lou, W1QJ to see they have any spare multi-band Input Boards.
    Carl, K1MH discusses (2012, QRZ Tech Forum) that their were at least three (3) production versions of the Clipperton L amplifier.

    Tony King, W4ZT (sk, 2009) -- Tuned Input board (used for GS35b amplifier), 2004.
    FAR CIRCUITS (Illinois) has the PC boards 6 POSITION TUNED INPUT FILTER.pdf

    Paul Hewitt, WD7S (sk, 2008) -- TU-6B Nine band Tuned Input board, 2008
    These disappeared after his death in 2018.

    Attached Files:

    Last edited: Aug 16, 2019
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    The OP never returned to tell us what kind of rig he's using to drive the Clipperton.
  3. N8FVJ

    N8FVJ Ham Member QRZ Page

    If your HF radio has an antenna tuner, do not be concerned the amp does not have a tuned input. Use your HF radio antenna tuner on each band.
  4. AF7XT

    AF7XT Ham Member QRZ Page

    You can tune a radio but you can't tune a fish.
    What if you mix...mayonnaise right in the can with the tuna fish? Hold it! Hold it! Wait a minute! Chuck! Take live tuna fish...and feed them mayonnaise. Oh this is good. [speaks into tape recorder] Call StarKist.
    K5RT and W1TRY like this.
  5. KN4VCT

    KN4VCT Ham Member QRZ Page

    Hey guys I'm sorry I went mia, thank you for the help! Lots of very helpful information. I'm driving the Dentron with an Icom ic-7100: no internal tuner.My swr seams pretty reasonable on most bands but it could be better, sometimes up to 2:1 at rig after tuning between my amp and antenna. The multi band input board seems like a good idea to me.
    Oh and for now I key the amp manually with a momentary foot switch.
  6. WE4E

    WE4E Premium Subscriber QRZ Page

    The relay isn't original, but the amp generally looks pretty clean.
  7. W9GB

    W9GB Ham Member QRZ Page

  8. KN4VCT

    KN4VCT Ham Member QRZ Page

    @WE4E: That's good to know, it runs well in general, less than 100 watts of drive gets me around 1100-1200 peak on 20 meters, with 40 and 80 meters I stick to around 45-50 watts drive for 700-800 pep max. At higher power I think I had something arcing on the lower frequencies (tuner maybe?) Although I'm using a compromise antenna: ZS6BKW so maybe voltage is just too high when tuned up at higher power.
  9. KN4VCT

    KN4VCT Ham Member QRZ Page

    @W9GB : That sounds a bit above my current skill set, but I love to learn as much as I can, so some day I'm sure I'll be capable.
  10. N0NC

    N0NC Ham Member QRZ Page

    @W9GB looked for the TU-6b on ebay, but couldn't find it. Was going to buy one, but procrastinated too long (WD7S SK).
    @KN4VCT Andrew, really like my clipperton L, Used it on 160 thru 20, 15 and 10 seemed a little unstable. I never got around to checking the parasitic suppressors, matbe I'll have to do that one of these days. The ZS6BKW is a G5RV opinized for 40-10, some loading it on 80 meters is probably causing a really high voltage in the tuner i'd bet. Don't know if anyone has mentioned it or not, but the plate choke in the L has resonances that cause problems on 17 meters. A lot of Clipperton owners have replaced the stock plate choke with one from Ameritron that takes care of that problem.
    73, Chuck

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