GOES 1691 MHz
NOAA 11* 137.62 MHz
(afternoon)
NOAA 12 137.5 MHz
(morning)
NOAA HRPT 1698 MHz
METEOR (Russian) 137.85
137.4
137.3 MHz
U.S. polar-orbiting morning satellites generally transmit at 137.5 MHz, after-
noon satellites transmit at 137.62 MHz. U.S. satellites are launched with the
capability to transmit at both frequencies (2 APT and 2 HRPT frequencies
are available for ground control to chose from on each polar orbiter). Note
that the U.S. uses a two-polar-satellite system to provide complete Earth
coverage; existing satellites in standby mode can be activated to replace
the designated satellites if needed.
- pending successful instrument checkout, the recently launched NOAA
14 will replace NOAA 11 as the designated afternoon satellite.
NOAA Weather Radio 162.550 MHz
162.525
162.500
162.475
162.450
162.425
162.400
Hertz is the unit for measuring the frequency of any radiated signal.
One Hertz equals one cycle per second
One Kilohertz (kHz) equals 1,000 cycles per second
One Megahertz (MHz) equals 1,000,000 cycles per second