Sync Time

TM 11-5820-890-10-8

4.3c.

Sync Time

OTHER VARIABLE

The remaining variable required for two or more frequency hopping

radios to communicate is called "Sync Time." In addition to the FH Data

elements discussed above, communicating radios must also have the

same sync time, within plus or minus 4 seconds.

RADIO CLOCKS

In order to maintain proper sync time, the SINCGARS radio uses seven

internal clocks, a base clock plus one for each of the six FH channels.

MAN and CUE settings will display the base clock time.

For purposes of net opening, sync time can be loaded into the radio

LOADING TIME

three

ways:

electronically

from

ANCD or

PLGR

(RT-1523A/B/C/D/E only); manually through the RT keypad; or by

receipt of a cold start net opening ERF. All three procedures set all

seven clocks to the same sync time.

The plus or minus 4 seconds sync time requirement applies to each net

CHANNEL TIME

individually. For example, if you are operating on Channel 1, and have

proper sync time for that net, you cannot communicate on Channel 2

unless you also have the proper sync time for that net. With a separate

clock for each channel, the radio allows for time differences greater

than +/- 4 seconds among nets.

CHANGING TIME

Once your radio is operational in the FH mode, sync time can be

changed in all seven clocks by the three methods discussed above.

Sync time can be changed in a single channel, leaving other channels

unchanged, only by receipt of an ERF and storing it in the channel to be

changed.

DANGER

Nothing will take your radio OUT of a FH net quicker than changing

sync time unintentionally. Normally, a SINCGARS operator loads sync

time in preparation for net opening and does not touch the TIME button

thereafter.

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