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Ut 40 and 50 tone squelch

I am looking for a schematic diagram of ut 40 and 50 tone squelch for my icom 28H mobile base and portable icom 2G.

Pls help help where can i get this diagram cause here in our place i cannot buy one cause there is no stock here.

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Go to , there is a layout of the decoder in this pdf file. I hope this helps

73's de Patrick N5SLI

Posted on Nov 14, 2008


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Any FM transmitter operating in those frequency ranges will be received and played thru the speaker - unless they are encoded with a squelch decode sub-audible tone or digitally encoded squelch control that does not match the one set to the IC-T8E. Program the squelch to be open or to match that of the transmitter so that the radio will play only when that particular transmitter is transmitting.

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  2. Press and hold the "Set Mode" button on the top of the radio for 2 seconds to enter set mode.
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  4. Push "Scan/Tag" to toggle the CTCSS tone frequency/DTCS code setting modes.
  5. Push "CH Up" or "CH Down" to set the desired CTCSS/DTCS code or remove the codes by rotating it to "0" or "OFF."
  6. When the tones are set as you wish press and hold the "set" button at the top of the radio again for 2 seconds to exit.
  7. Done.
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