Naahhh.... In TIA-603-C paragraph 1.3.5.3 is in the "Definitions" section not in the "Standards" section.
1.3.5.3 refers to the "Definition" of the "standard test modulation". The correct section for the actual "Standard" is under: "Standards for All Equipment" 3.4.17, "Transmitter Subaudible Deviation" 3.4.17.2 "Standard" In that table, for rated system deviation of +/- 5.0 kHz, the deviation limits are 500 to 1000 Hz. Hence it follows that the midpoint would be 750 Hz deviation which is the value most of us use as a target. ------------------------------------------------------------- --- In [email protected], "Eric Lemmon" <[EMAIL PROTECTED]> wrote: " No, that is not correct. TIA-603-C states that the Standard CTCSS Modulation for an emission of +/- 5 kHz deviation, that is, a 20K0F3E emission, "is" 500 Hz. There are no "at least" or "minimum" qualifiers. This is in Paragraph 1.3.5.3. 73, Eric Lemmon WB6FLY"
