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Tuning Flex 6600 with an external ATU.

Amos Sobel
Amos Sobel Member ✭✭
in FLEX-6000 Signature Series

I did build a 90 meter long longwire loop to serve as a 160m antenna. It does not tune with my Flex 6600 ATU but it does tune with MFJ-993B ATU connected to my ICOM-7300. I did disconnect the MFJ-993B from the 7300, put it on manual control, and connected it to the Flex 6600. Playing all tricks I did not manage to get the 6600 tune the antenna with the MFJ.

  1. How to you make the Flex 6600 tune an external ATU in general and MFJ-993B in particular.
  2. Which types of ATU are fit for use as an external ATU for Flex 6600.

Amos 4X4MF

Comments

  • John KB4DU
    John KB4DU Member ✭✭✭

    Amos, I use an MFJ 929 which is pretty much the same tuner without the meter. It works very well. I set the tune power in the flex to 10 watts, and click the tune button. I don’t have an internal tuner. Is yours off?

  • Amos Sobel
    Amos Sobel Member ✭✭

    John

    Thank you for coming back.

    1. Which Flex are you using?
    2. Is it possible to turn the 6600 ATU off?

    Amos 4X4MF

  • KD0RC
    KD0RC Broomfield, COMember ✭✭✭

    Hi Amos, Yes, you can turn the ATU off. Click the ATU button on the TX tab of the Radio Panel. The Tune button will still output a signal when clicked. If you use an external automatic tuner, be sure to turn off the internal tuner or they will chase each other looking for a match.

    73,

    Len, KD0RC

  • Amos Sobel
    Amos Sobel Member ✭✭

    John

    Following your remarks and reading the manual again, I did finally manage to get my 6600 work on 160m with the new antenna.

    Thanks again and see you on 160m FT8.

    Amos 4X4MF

  • John KB4DU
    John KB4DU Member ✭✭✭

    Good that you got it going. Stayed in Jerusalem last time, maybe Haifa next time.

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