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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 http://www.repeater-builder.com/icom/icom-ic-4ga-gat-ge-svc-man.pdf , 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.
  3. Push the top button again several times until "C" appears.
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  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."
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ok here is the awnser you are looking for you acn download the service manual here.
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