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6300 Keying Kenwood TL-922a

John Watson W4JCW
John Watson W4JCW Member ✭✭
I have the 6300 connected to the 922a properly, but when I move the amp to operate, it keys the amp???


  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin
    edited April 2019
    Hi John

    The TL922 is a high power amp keying line.  You will need a keying buffer in place.

    I assume you have the RCA connected to TX1.

  • George KF2T
    George KF2T Member ✭✭✭
    edited February 2019
    Do you have an isolation device between the Flex and amp? If I recall, the TL922 keying may pull more current than the Flex relay can handle,
  • Eric Davenport
    edited June 2019
    I use an Ameritron ARB-704 between the 6600 and the TL922. Never checked if it was necessary due to how much the TL922 pulls but I have always used 704 between whatever radio I had and the amp. My logic went to better safe than sorry.

  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited November 2018
    Had a TL922A **** an Icom 706 Mk II G keying circuit You must get a 704 unit !!!
  • Greg N8GD
    Greg N8GD Member ✭✭
    edited November 2018
    With the behavior you describe, it is most likely that you have caused the keying device (transistor or other) to fail in a shorted condition inside your 6300.  Time to open a help desk ticket and let Flex sort it out for you, which will most likely result in sending it back to them for repair.  Older amps, like the TL-922A. draw far too much current on the keying relay coil for modern day transceiver keying circuits (Flex is no exception).  The ARB-704 is an absolute necessity, so get one before you get the 6300 back from repair!
  • Dudley  WA5QPZ
    Dudley WA5QPZ Member ✭✭✭
    edited March 2020

    If the high voltage/current did not destroy the chip,  you might try removing the DC from the radio and let the internal chip reset,   but DO NOT connect that amp directly to the radio,  needs a keying relay inbetween the radio and that amp.

  • Dave Parker
    Dave Parker Member
    edited June 2019
    Eric how is the connection made (which wires go where) from the 6300 to the 704 to the amp?
  • Larry _ NY8T
    Larry _ NY8T Member ✭✭✭
    edited June 2019


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