Spectracom Corporation
TV210V, U, G, W & TV400 V, U, G, W
TimeView Digital Display Clocks Instruction Manual
2-19
MODE 22
Pressing the Mode switch again advances the setup process to the units of
seconds variable. Use the Set button to select the desired units of seconds
value.
2.5.5 Exit
Configuration
Mode
Pressing the Mode switch for the twenty-third
time causes the clock to exit from the
configuration mode. The clock will return to normal operation.
2.5.6 TimeBurst
Configuration
The Spectracom Model 8185 TimeBurst connects to the radio transmitter directly or
through the radio console using the Audio Output, PTT (Push To Talk), and Busy
(Inhibit) lines. The PTT and Busy lines can be optically isolated. The Busy (Inhibit)
signal from the transmitter is monitored by the TimeBurst and holds off sending a
message until the channel is clear of traffic. The hold-off does not affect accuracy
because the message sent is the current time of transmission.
The TimeBurst sends the time message automatically on a schedule set during its
installation. The minimum recommended broadcast schedule is every four hours to
maintain the 250-millisecond accuracy of the TimeView wireless clock. Once per hour
is a typical schedule. The TimeBurst can be manually prompted by connecting the
remote prompt to a push button on the radio console or by using the front panel Prompt
button.
TimeBurst’s total air time is about one second. The message is a digital burst in the
audio band and sounds like a chirp, similar to an ANI burst from a transceiver (Audio
Minimum Shift Keying, or AMSK).
Refer to the Model 8185 TimeBurst manual for information on message scheduling and
operation.
