User's Manual Part 1

66 OEMV Family Installation and Operation User Manual Rev 5B
Chapter 4 Operation
To confirm you are tracking an L-Band signal, log the L-Band status information by entering the
following command:
log lbandstat
For example, if you are receiving CDGPS, the fifth field after the header should be 00c2:
lbandstat com1 0 43.5 finesteering 1295 149951.671 00000000 976f 34461
<1547546977 46.18 4541.0 0.00 00c2 00f0 0 0 0 8070 0001 0 0 0
Please refer to the LBANDSTAT command for details.
4.7 Pass-Through Logging
The pass-through logging feature enables the GNSS receiver to redirect any ASCII or binary data that
is input at a specified COM port or, if available, USB port to any specified receiver COM or USB port.
This capability, in conjunction with the SEND command, can allow the receiver to perform bi-
directional communications with other devices such as a modem, terminal, or another receiver.
There are several pass-through logs. PASSCOM1
, PASSCOM2, PASSCOM3, PASSXCOM1,
PASSXCOM2, PASSXCOM3, PASSUSB1, PASSUSB2, PASSUSB3 and PASSAUX are available
on OEMV family receivers for logging through serial ports. The AUX port is available on OEMV-3-
based products.
Refer to the PASSCOMx log for details.
4.8 T Sync Option (OEV-2, OEMV-3 or ProPak-V3 only)
This section describes the relationship constraints of the input signal phase when the Time
Synchronization Modification (T Sync Mod) option has been added to an OEMV-2 card, OEMV-3
card or ProPak-V3.
The 5, or 10, MHz external oscillator and 1PPS signals must maintain a phase relationship as shown
in Figures 17 through 20 starting on Page 67. The 1PPS signal must NOT fall within 5 ns of each of
the 4 positions of the 5 MHz sine wave, or within 5 ns of each of the 2 positions of the 10 MHz sine
wave. These are areas of instability and should be avoided.
When an external oscillator is connected, T Sync pulses are sent through hardware on the receiver
card and cannot be disabled. You must issue a time-synchronization-enabling command (refer to
ADJUST1PPS TIME in the OEMV Family Firmware Reference Manual) for the receiver to track
properly.
To adjust the phase relationship of the 5, or 10, MHz and 1PPS signals, add additional RF cable to the
5, or 10, MHz line. For example, if using RG58, each 1 meter piece will move the 5, or 10, MHz phase
by approximately 5 ns.