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
|2||SNR in db|
|3||Signal frequency in kHz|
|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).|
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.
|7||Channel used. Output 1 if the RTCM is being used for outputting DGPS position. 0 otherwise. If the system is not outputting DGPS, the output is 0 also.|
|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.|