ATU requires three or four tries

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  • Updated 6 months ago
The ATU doesn't appear to be working properly on my Flex 6400.  Whenever I turn the Maestro and radio on, I have to press the ATU button three or four times before it tunes.  Each time it takes five to ten seconds for the tuner to turn off.   Eventually it tunes it to about 1:1.2.  This occurs even when I have not changed the frequency from the last time I used the radio.
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Mike-N1VE

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Posted 6 months ago

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Michael Walker, Employee

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Mike

The 6M ATU settings are a bit different than for the rest of the HF bands.

Do you know how much RF cable loss you have on 6M?  What type of antenna are you using and does it require a tuner? 

Mike

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Mike-N1VE

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I am operating on 20-meters.  The antenna is a Crushcraft R-7.  I have no problem tuning it with the Yaesu 990 or the manual tuner.
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Michael Walker, Employee

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Sorry, I thought you were on 6M.  my  apologies.  Clearing the memories may help.
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Neil D Friedman N3DF

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Do you have the ATU memory function turned on?
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Mike-N1VE

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I have no idea.  I am looking at the Flex series user guide and it refers to a setting in the TX menu.  I cannot find the TX menu in the list of menus on the Maestro.
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N9VC

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Look at the face of the Maestro. On the right side is the mic gain, push in and you will
get the TX menu. It is marked under the control.
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Mike-N1VE

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Thanks N9VC.  ATU MEM was not highlighted.  I pushed it and now it is highlighted.  Without changing the frequency from where it was tuned an hour ago, I pressed ATU on the Maestro and the radio went through its tuning procedure and the ATU light was lit.  SWR was out of sight.  I pressed the ATU two more times and then the SWR was where it should be and the power output was about 100 watts.  Then I turned down the band and the SWR was high, so I pushed the ATU once and it was tuned. Then I went up the band to the first frequency and it was tuned without pushing the ATU.  I assume this is normal.  Thanks for your help.