This ensures the frame and segment syncs of the two signals don’t line up. The frequency tolerance of the DTV transmitters should be ☑0 Hz.” An offset of 1.5 times the segment frequency (i.e., 19,403 Hz) appears to provide the best performance. There are several choices that meet this requirement. “In the DTV co-channel interference condition, it has been found that a DTV pilot frequency offset that is an odd multiple of half the DTV segment rate provides improved interference rejection. This offset is defined in ATSC Recommended Practice A/64B, (section 5.1.6.1). One of the offsets remains relevant-between two ATSC 1 stations operating on the same channel. (This offset won’t be relevant after July 13, 2021, when all LPTV stations must cease analog broadcasting.)
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This is 22.697 kHz above the normal 309.440559 kHz offset from the channel edge, assuming the DTV signal is centered in the 6 MHz TV channel. The FCC rules mandate an ATSC station must have its pilot carrier 5.082138 MHz above that of the lower adjacent NTSC station’s visual carrier. Excluding that case, the only requirement is that the emissions from the transmitter comply with the mask requirements in Section 73.622(h) (see sidebar).īack in 1998, I wrote about frequency offsets for ATSC 1 in my column most related to analog stations.
The correct answer is that the FCC does not specify a frequency tolerance for digital TV (ATSC 1 or 3.0) transmissions except in relation to lower adjacent analog TV stations.
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