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 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of wd8chl Sent: Saturday, July 19, 2008 11:50 AM To: [email protected] Subject: Re: [Repeater-Builder] PL Problem Eric Lemmon wrote: > Tom, > > The TIA-recommended standard deviation for CTCSS is 500 Hz on a 16K0F3E or > 20K0F3E emission. Most CTCSS decoders can reliably detect tone deviated as > low as 100 Hz. Any deviation greater than 500 Hz can be considered > excessive. > The TIA spec is for +/- 500Hz deviation *minimum*. Any less then 500 is considered inadequate. 800-1000 Hz is a maximum. So anywhere between 500 and 800-1000 is right.
