Kenwood TR-2400 tone encoder?

Discussion in 'Ham Radio Discussions' started by KE0DNZ, Aug 10, 2018.

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  1. KE0DNZ

    KE0DNZ Ham Member QRZ Page

    With my Kenwood TR-2400 that I'm trying to resurrect, I've found that there's a third-party tone encoder; naturally, I wasn't lucky enough for my 2400 to have one installed, so I need to find one so I can use it with my local repeater.

    I've googled it several times; NOTHING!

    Would anyone know where to find one, or maybe a schematic to DIY it?


    -Bob KE0DNZ
  2. KA9JLM

    KA9JLM Ham Member QRZ Page

    Did you search here on QRZ ?

    I seen a few for sale here recently.

    Frequency adjustable by dip switches.

    In the day we used a 555 and rolled off the square wave with caps.

    A LM567 may work better. It is a decoder, You can use the PLL Osc pin to encode.

    Good Luck.
    Last edited: Aug 10, 2018
  3. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

  4. KY5U

    KY5U Subscriber QRZ Page

    Key microphone, hum. Problem solved.
    K7MH likes this.
  5. KA9JLM

    KA9JLM Ham Member QRZ Page

    That is cool that they still make them.
    Hooking it to a power supply that has a lot of AC ripple will work too. For a little while.
  6. KE0DNZ

    KE0DNZ Ham Member QRZ Page


    Is there a schematic available?
  7. KE0DNZ

    KE0DNZ Ham Member QRZ Page


    It looks like they're still available!
  8. KE0DNZ

    KE0DNZ Ham Member QRZ Page

    Will that work for a 146.2 tone?
  9. KE0DNZ

    KE0DNZ Ham Member QRZ Page

    Interesting... :)
  10. VK6ZGO

    VK6ZGO Ham Member QRZ Page

    If you only want a CTCSS for one local repeater, a home brew one will do a good job.
    Will VK6UU published a couple of different types in the WIA mag "AmateurRadio" quite a few years back.

    I built the LM567 one, & it worked well.
    They are on the 'Net somewhere.
    Googling CTCSS & VK6UU might find it.

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