ATU failing to tune up 60 meters.

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  • Updated 11 months ago
  • Answered
I have been working FT8 on 60 meters with a DX160 OCF Windom antenna and 60 meters was working just fine.
I worked the NAQP SSB with a DX80 over the weekend because it is higher in the air than the DX160.
When I went back to the DX160 to work FT8 the ATU will not tune 60 meters and the SWR is off the chart.
I have tried a hard reset on my Flex 6300 but it will not tune the antenna at all, it just quickly flips on and off.
Any suggestions?
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Ronald Barber

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  • confused and fustrated

Posted 11 months ago

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Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

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Official Response
Here is the issue.  In USB mode, the TUNE carrier is on the suppressed carrier frequency (what is displayed in the slice frequency readout).  60m is a channelized band, so that frequency is technically always a band edge.  If you do a TUNE operation on that frequency, some of the RF emissions are outside of the channel (out of band).

You need to change to CW to do a TUNE operation or tune up in frequency about 100 Hz and it will work.