CLOCKOFFSET

Adjusts for delay in 1PPS output

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This command is used to remove a delay in the PPS output. The PPS signal is delayed from the actual measurement time due to two major factors:

• A delay in the signal path from the antenna to the receiver

• An intrinsic delay through the RF and digital sections of the receiver

The second delay is automatically accounted for by the receiver using a nominal value determined for each receiver type. However, since the delay from the antenna to the receiver cannot be determined by the receiver, an adjustment cannot automatically be made. The CLOCKOFFSET command can be used to adjust for this delay.

For dual antenna receivers, a CLOCKOFFSET_1 command should be issued to adjust for delay on the second antenna. As described in Table: Binary Message Header Structure, the message type indicates the message is for the second antenna. To issue an ASCII message, enter CLOCKOFFSETA_1.

Message ID: 596

Abbreviated ASCII Syntax:

CLOCKOFFSET offset

Factory Default:

CLOCKOFFSET 0

ASCII Example:

CLOCKOFFSET -15

There may be small variances in the delays for each cable or card. The CLOCKOFFSET command can be used to characterize each setup. For example, for a cable with a delay of 10 ns, the offset can be set to -10 to remove the delay from the PPS output.

Field	Field Type	ASCII Value	Binary Value	Description	Format	Binary Bytes	Binary Offset
1	Command header	-	-	CLOCKOFFSET header This field contains the command name for abbreviated ASCII or the message header for ASCII (see page 1) or Binary (see page 1).	-	H	0
2	offset	±2000		Specifies the offset in nanoseconds	Long	4	H