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TC-780 Nose at end of transmission

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jsp196

Newbie
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Dec 30, 2013
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I have a TC-780 and every time I transmit (correct frequency and using CTCSS) all other radios hear a moment of broken squelch before and after each of my transmissions. It's really annoying because all the other radios (Motorolas) are completely clean before and after transmissions. How can I fix this? Is there some type of signaling option in the programming software that I can adjust to eliminate the noises?

Thanks.
 

RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
4,615
I have a TC-780 and every time I transmit (correct frequency and using CTCSS) all other radios hear a moment of broken squelch before and after each of my transmissions. It's really annoying because all the other radios (Motorolas) are completely clean before and after transmissions. How can I fix this? Is there some type of signaling option in the programming software that I can adjust to eliminate the noises?

Thanks.
Not sure why there would be noise on the beginning of your TX. Make sure you don't have MDC1200 unit ID turned on. Having a squelch burst at the end of your TX is a result of not having "reverse burst" generated by an off brand radio. Motorola radios apply a phase shift of about 120 degrees on the CTCSS tone when the radio dekeys. This speeds up muting in the repeater before your TX carrier drops. If your radio programming software has an option for the CTCSS to produce "reverse burst", a phase shift or to turn off CTCSS tone a few tenths of a second before the TX carrier drops when you dekey, that will solve the problem at the end of your transmission, I have no idea why the beginning of your TX would create noise unless there is a malfunction.
 
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