The FCC does not consider digitized audio such as P25 or D-Star digitized audio to be a data emission instead they consider it to be phone (I'm referring to voice only transmissions). The C4FM modulation type currently used with phase I 12.5Khz P25 voice signals is still FM and while it has a different emission designator (8K10F1E) than analog narrowband FM it is still phone according to the FCC. Gary
Nate Bargmann wrote: > Here is the relevant portion for FCC jurisdictions: > ----- > §97.309 RTTY and data emission codes. > > (b) Where authorized by §§ 97.305(c) and 97.307(f) of this part, a > station may transmit a RTTY or data emission using an unspecified > digital code, except to a station in a country with which the United > States does not have an agreement permitting the code to be used. RTTY > and data emissions using unspecified digital codes must not be > transmitted for the purpose of obscuring the meaning of any > communication. When deemed necessary by a District Director to assure > compliance with the FCC Rules, a station must: > > (1) Cease the transmission using the unspecified digital code; > > (2) Restrict transmissions of any digital code to the extent > instructed; > > (3) Maintain a record, convertible to the original information, > of all digital communications transmitted. > ----- > Looks like to me that P25 is legal above 50.1 MHz noting the bandwidth > restrictions of 97.307(f)(5) and 97.307(f)(6). From 33cm and shorter > wavelengths, there are no bandwidth restrictions--97.307(f)(7). > > 73, de Nate >>
