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TM 11-5821-333-12
3-4. LOADING AND CLEARING FH SYNC TIME. Continued
b. Loading FH Sync Time (ERF):
There are seven clocks in the RT. There is a master clock and one clock for each channel 1 through 6.
When time is first set in the RT (cold start ERF or manually), all seven clocks are set to the same time. It is not
possible to reset the sync time for just one channel manually. This can only be done using ERF. When ERF is re-
ceived into a specific channel, the sender’s net time is also received and stored in that channel. A typical NCS
procedure for loading FH sync time through receipt of an ERF would be:
(1) Prepare NCS radio to receive an ERF.
(2) Request, or stand by for, an ERF from higher level NCS.
(3) Store ERF in one channel (e.g., Chan 2).
Read "HFxxx" and note display blink. Press
STO (Sto/ENT), read "STO_", and press "2". ERF is now stored in Channel 2.
(4) Now store ERF in own unit channel (e.g., Chan 1). Set MODE to FH-M and
PRESET to 2. Press LOAD (H-Ld), read "HLD_". Press "2", read "HFxxx". press
STO(Sto/ENT), read "STO_", press 1.
ERF from higher NCS is now also stored in
unit operating channel.
(5) Change net ID of ERF in Chan 1 to that designated for own unit (either by keypad or
use of fill device).
NOTE
NCS radio is now ready for own unit net opening.
By loading sync time by ERF, the higher net,
your own NCS radio, and your unit operators now all have the same sync time. This fact makes
cross-net communications easy. The same procedure can be used also for net updates.
c. Checking FH Sync Time:
(1) Set FCTN switch to SQ ON and PRESET switch to the channel to be checked. (If
checking “base” time, MODE switch must be set to SC.
(2)
Press TIME three times.
. ,
Each press will give You a different display.
Refer ‘to the Julian calendar as needed, page A-2.
1ST PRESS
2ND PRESS
3RD PRESS
DAYS
HOURS MINUTES
MINUTES SECONDS
(LAST T WO-DIGITs
OF JULIAN DATE)
NOTES
Changing FH sync time must be done with caution. FH sync time is not the same as local time.
Normally, FH sync time is changed only when loading other FH data. Changing FH sync time
will result in loss of communication with other radios in net.
FH sync time for all RTs in a net must be within ±4 seconds.
FH sync time is lost if the RT memory is erased (FUNCTION switch set to Z-A or STOW).
The FH sync time clock will stop running when the RT FUNCTION switch has been at OFF for 24
hours or more.
FH sync time can be checked by pressing keyboard •••/TIME three times and watching the
display.
Section Il. NET MANAGEMENT
Subject
Para
Page
Bringing Another Station into the Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3-7
Cold Start Net Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3-5
Net Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3-4
Net Update Using ERF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3-6
3-5. NET OPENING.
Special data is used by the RT to operate in FH mode. All radios in a net must have the same data. Some FH data
is loaded into the net member RT using local fill procedures. Other FH data is transferred to the net member using
net opening procedures. Net opening is the means by which you, the NCS, transfer to the net members any FH
data they still need after local fill procedures are completed.
The Signal Operation Instructions (SOI) will tell you
what FH data to use.
NOTE
l If you want to save your FH data after net opening, do not set FUNCTION switch to
3-4
STOW or Z-A.
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