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TX on 136 Khz

My Flex 6400 will TX out of the XVTA port at 0 dbm on 476 Khz.

However, on 136 Khz it is blocked.

Is it possible to get a turf file that will allow TX on 136 Khz?


Best Answer

  • Ken Thompson
    Ken Thompson Member ✭✭
    Answer ✓

    I thought I would let those interested in this post that I did submit a help desk ticket and the answer I got from Tim Ellison was (TURF files are only applicable to the operation of the PA and not the transverter port. The DAC in the FLEX-6000 is not capable of transmitting at that low of a frequency.).

    So, help desk was a waste of time.

    However, after further investigation I noticed that I had the PTT inhibit box ticked in the band settings.

    Once I enabled the PTT on 2200m my Flex 6400 does transmit at 0 dbm out of the XVTR port, more than enough to drive a custom built Fet PA for 136Khz.


  • VE7ATJ_Don
    VE7ATJ_Don Member ✭✭✭
    edited September 2022

    Hmmmm... Are you sure you have the XVTR output (red) selected on your slice? (Just asking as this is a mistake I make ALL the time :-))

    Also, have you selected CW as output mode? SSB might be too wide for the available bandwidth... Here in Canada we're only allowed 135.7 to 137.8 and phone is not allowed.

  • VE7ATJ_Don
    VE7ATJ_Don Member ✭✭✭

  • Hi Don

    Thank you for your suggestions unfortunately I have XVTR selected, and bandwidth is correct.

    I use the same settings on 476 Khz to drive a 200W Fet amplifier and that works fine. VK6 to KH6 on WSPR

    It looks as though I will have to contact Support and see if they will supply me with a Turf file that will enable 136 Khz TX on my Flex.




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