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Internal 6000 series tuner question?

I am using a 6600M and I have had two occurrences of not being able to transmit; The TX button would not turn red when pressed. 

The 6600M ATU was set for Byp.

Pressing the Tune button did nothing. 

I changed the ATU to Tune and it automatically started to adjust.

When tuning was completed I pressed the TX button. It lit red and when I pressed Tune the 6600M started to transmit.

My question is, does the 6000 series internal tuners, when in Byp, actually go to a neutral position?

Or, is this some sort of Software/Hardware issue??


  • Joe N3HEEJoe N3HEE Member ✭✭
    edited February 2019

    When in bypass the ATU is physically switched out of the TX path.  See hardware reference guide page 39.  Can you replicate this behavior?  Or is it random ?  I have not had this experience with my 6600M.  -Joe
  • Tom W3FRGTom W3FRG Member
    edited April 2019
    Hopefully, that's the way it should be, switched out.
    Yes, totally random. Last week was the first I noticed this anomaly and again yesterday.
    Cannot reproduce and it happened when I was switching antennas/bands from 160m to 75m.
  • WX7YWX7Y Member ✭✭
    edited June 6
    Sounds like you where out of the HAM band to me, If ANY part of your transmit filter is outside the legal Amateur radio band or channel for the 5MHz band the radio will lock out the transmitter. 


  • Tom W3FRGTom W3FRG Member
    edited November 2018
    I only use pre set up profiles and they are for in band connections.
    If that were the case, the ATU would not tune.

    Tom W3FRG
  • Steve K9ZWSteve K9ZW Member ✭✭✭
    edited November 2018
    Do profiles keep you “in band?” Thinking not so much. Trying to transmit out of band is a common way to trigger transmit-inhibit. In rare instances I’ve found transmit inhibited, but never anything I could duplicate and nothing that survived a full cold reboot. It looked like conflicting software with third party software not being updated to match the latest SmartSDR. YMMV of course. Worth having a really in-depth look at your system configuration for all running software if you can duplicate the problem again. If it persists and can be duplicated opening a Help Ticket will get the FRS team on it. It is of course the hardest to diagnose completely random isolated problems that cannot be induced to repeat themselves. GL & 73 Steve K9ZW
  • Tom W3FRGTom W3FRG Member
    edited April 2019
    The 6600M will not Transmit or Tune out of band.

    Tom W3FRG
  • edited March 11
    Without the MARS option, that's correct. 73 Jim, WQ2H

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