TM 11-5820-890-10-1
A cold start TSK must be loaded into the MAN channel before it is possible to perform
cold start net opening. The TSK determines the starting point at which the RT frequen-
cy hops. A TSK is loaded locally with an ECCM fill device. Use the procedure for
loading a hopset to load your RT with the TSK. If MAN channel does not have a TSK
loaded into it, the RT will use the TSK present in channel 1. If a TSK is not loaded
in either MAN or channel 1, cold start is not possible. See page 3-4.
FH sync time is used during FH operation. NEVER confuse FH sync time with the
time of day. There are seven separate clocks inside the radio. There is a base clock,
and a clock for each CHAN setting (1 - 6). MAN and CUE settings will display the
base clock time.
When time is first loaded into the radio (cold start ERF, or manually), all seven clocks
are set to the same time, When an ERF is received into a specific channel, the send-
er’s net time is also received and stored in the channel with the hopset (it must be
within one hour of base clock time already in the radio). Whenever FH sync time
is loaded using the keyboard, ALL of the clocks in the radio are reset to the base
clock’s time. It is not possible to reset the net time for only one channel manually.
This can only be done using ERF.
Updating the FH sync time is done automatically each time a message is received
from the NCS. The NCS must be an active member of a FH radio net so that mem-
ber’s radios are updated (NCS is the time standard for net). If you are a member
of more than one net, it is important that you communicate with the NCS daily.
To find the time of a specific net (monitoring FH sync time of other nets), set the
CHAN to the position where the net's hopset is stored; then press
/TIME. The
display will show that net’s time. It is possible to check the time of a net while operat-
ing in a different net: Enter the number of the channel (1 - 6) on the keyboard while
the time of your operating net is on display. The display will change to that net’s
time.
SYNC TIME DIFFERENCES
plus or minus 4 seconds
plus or minus 1 minute
normal FH
May use passive late
net entry to gain nor-
mal FH operation.
1 to 59 minutes
May use CUE and ERF
to gain normal FH op-
eration.
3-5
