In Brazil, the frequency 87.7 FM is one of the frequencies reserved for
community radio stations. These stations have power limited to up to 25 watts and coverage limited to a radius of up to 1 km.[3]
It also uses Pan American analog TV sound VHF channel 6 in
PAL-M (83.25 - 87.75 MHz).
87.75 MHz, a frequency-modulated audio subcarrier used by all
NTSC-M analog channel 6 television stations (discontinued July 13, 2021 in the United States)
For a list of channel 6 television stations transmitting using a modification of the
ATSC 3.0 digital TV standard to carry an analog FM audio feed on 87.75 MHz, usually advertised as 87.7 FM, see
Channel 6 radio stations in the United States.
2 Shortwave uses a combination of
AM,
VSB,
USB and
LSB, with some
NBFM and
CW/
morse code (in the case of
time signal stations) as well as numerous frequencies, depending on the time of day/night, season, and solar activity level. A reasonably full list from 16 kHz to 27MHz can be found at
[2]
3 Regions 1 and 3 also use Region 2's frequencies as well, with 50 to 100 kHz spacing.