Your radio is listening for only signals that have a 100.0 PL tone. You key up your repeater that transmits that PL tone on its output and your radios squelch opens - then closes when the PL tone disappears.For a better experience, please enable JavaScript in your browser before proceeding.
Is there more to it than this Because I recently sold a radio (TM261A Kenwood) on line that I used soley for repeater operation. It did have the tone board inside as all the repaters here have tones on them, and I was able to access them with this radio. Now the buyer is trying to say it doesnt have CTCSS and wants a partial refund. I emailed him back asking if hes having trouble with repeater access. It is a function that allows the radio to remain silent until the proper PL tone is received from a signal. CTCSS is the PL tone received to open squelch on radio B transmitted from radio A. Example: The repeater squelch will not open unless it receives a PL tone of 100.0. The repeater also transmits that 100.0 tone on its output. So, you cannot key up the repeater unless you transmit a PL tone of 100.0 however you can hear the repeaters response regardless if your radio is listening for that PL tone or not. If youre radio isnt trying to receive the PL tone, youre using carrier squelch, when the carrier from the repeater drops the squelch closes. ![]() Your radio is listening for only signals that have a 100.0 PL tone. You key up your repeater that transmits that PL tone on its output and your radios squelch opens - then closes when the PL tone disappears. If you were to receive a distant repeater on the same frequency that was not transmitting the 100.0 tone, your radios squelch would not open and allow you to hear that distant repeater. ![]() Ctcss Tone Board Code And DecodePL implies both encode and decode and CTCSS usually refers to encode and decode. Even though PL is a Motorola thing everyone seems to adopt the term for general tone squelch just like adjustable wrenches are called crescent wrenches even though its a trademark of the Crescent Tool Company. The TM-261A comes with tone encode and you need the optional TSU-8 board to decode and make use of the receive part of the tone squelch. The buyer of the radio seems to indicate receive problems with the tone squelch but if the radio had the TSU-8 it should work. Unless its broken. Did you test the tone decode function before selling prcguy.
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