30
information is returned in the format: identification, amplitude. The
identification number is the station index value defined in the LSTA?
query. The amplitude is a relative value in units of dB and can be used
to compare the relative amplitudes of stations detected. The value of i
can range from 0 to the number of stations found minus 1. The number
of stations found can be determined using the NSTA? query. If the
FS700 has not completed its station search, the values -1,-1 will be
returned.
LFOS?
The LFOS? query returns the instantaneous fractional frequency offset
between the LORAN station carrier and the FS700. The value is
returned in exponential format with values typically in the 10
-10
to 10
-11
range. If the FS700 is not currently locked, the value -999 is returned.
LPHA?
The LPHA? query returns the instantaneous phase difference between
the LORAN station carrier and the FS700's internal 100 kHz source.
The value is returned in degrees between -180 and +180 with 0.1
degree resolution. The value -999 will be returned if the FS700 is not
currently locked.
LSTA?
The LSTA? query returns the index of the station to which the FS700 is
currently locked. The correspondence of returned values to the LORAN
stations is shown in the table below. Because the secondary stations in
different chains transmit in different orders, look in the station list to
determine which secondary station index (1,2,3,4,5) corresponds to
which station (V,W,X,Y,Z). The FS700 will return the value -1 if the
station identification is unknown. For example, when the FS700 can not
find the master station, then it doesn't know the station identity. The
value -999 will be returned if no station has been selected.
i Station
-1
Unknown station identification
0
Master
1
1st secondary (usually V )
2
2nd secondary (usually W)
3
3rd secondary (usually X)
4
4th secondary (usually Y)
5
5th secondary (usually Z)
NSTA?
The NSTA? query returns the number of stations found during the
station search. If the search has not been completed, the value -999
will be returned.
STON?
The STON? query returns the noise margin of the station to which the
FS700 is locked. The returned value is in dB units. If the FS700 is not
currently locked, the value -999 is returned.
TIME (?) {h,m,s}
The TIME command sets the front panel time to h, m, s where the
hours, minutes, and seconds are in 24 hour format. The TIME? query
returns the present time in the format h, m, s.
