GSOF message: Radio

This message describes radio information. It contains the following data:

Radio info (Type 57 record)

Field	Item	Type	Value	Meaning
1	Output record type	Char	57	Radio information output record.
2	Record length	Char		The length of this sub-record excluding both the output record type byte and this record length byte.
3 to 4	GPS time weeks	Unsigned Short		Provides the unsigned 16-bit value of the GPS time in weeks. If GPS time is unavailable, this field will be 0.
5 to 8	GPS time (ms)	Unsigned Long	msec	GPS time, in milliseconds, of GPS week
9	Number of radios	Char	number	Identifies how many times the following "grouped" data will repeat: 0 = no radio data to follow 1 or greater = how many times the "Repeat for number of radio bands" data is repeated.
Repeater for number of radios
10	Radio data length	Char	0x09	The length of the "grouped" radio data section, including this byte.
11	Radio band	Char		Represents the type of data: 0xFF = No radio detected 0x01 = 450 MHz radio 0x02 = 900 MHz radio 0x03 = 220 MHz radio 0x04 = 2.4 GHz radio 0x05 = GPRS modem
12	Channel number	Char
13 to 14	Signal strength	Signed Short		Reported in units of dBm: 0x7FFF = measurement not available. For GPRS modems, 0 = not available.
15	Signal bars	Char	0 to 5	Indicates how many bars out of 5 should be used to represent the given signal strength.
16 to 17	Noise strength	Signed Short		Reported in units of dBm: 0x7FFF = measurement not available.
18	Noise bars	Char	0 to 5	Indicates how many bars out of 5 should be used to represent the given noise strength.
	TBD			For future expansion.