If the radio manufacturer claims to meet the requirements of
EIA/TIA-603B, an international standard for land-mobile radios, then the
radio MUST decode a standard CTCSS tone of 100 Hz or above in less than
250 ms. If the tone is lower than 100 Hz, then the maximum decode time
in milliseconds is given by dividing 25,000 by the tone frequency in
Hz. Thus, a 67 Hz CTCSS tone must be decoded within 373 ms. This
decode time is based upon a standard CTCSS deviation of 500 Hz. Most
modern radios are capable of decoding a proper CTCSS tone far more
quickly than the standard requires.
73, Eric Lemmon WB6FLY
erdin� oguz wrote:
I need information about Yaesu FT-50R (or any other HT). If it is on
tone squelch mode, What is the CTCSS tone detection time?...
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