NMEA-0183 message: PTNL,DG

L-band corrections and beacon signal strength and related information

This message, $PTNLDG, is a Trimble-created message. It outputs the L-band and beacon signal strength and other information.

Examples of the PTNL,DG message string are:

For beacon DG message: $PTNLDG,44.0,33.0,287.0,100,0,4,1,0,,,*3E

For L-band DG message: $PTNLDG,124.0,10.5,1557855.0,1200,2,4,0,3,,,*3C

DG message fields

Field Meaning
0 Talker ID
1 Signal strength
2 SNR in db
3 Signal frequency in kHz
4 Bit rate
5 Channel number. For a beacon message, the system locks only to the primary channel. As a result, there is not more than one beacon message. The channel for beacon is 0 (so it matches the DSM 232 family of GPS receivers). For L-band messages, the channel number is 2 (so it matches the DSM 232 family of GPS receivers).
6 Tracking status:

0: Channel idle.
1: Wideband FFT search.
2: Searching for signal.
3: Channel has acquired signal.
4: Channel has locked onto signal. For beacon, this means valid RTCM has been received. For L-band, this means good data has been decoded.
5: Channel disabled.

8 Channel tracking performance indicator. For beacon, this is the word error rate, which is in percentage. For L-band, this is the time since the last sync, in tenths of seconds ranging from 0 through 255.