Spectracom NetClock - Synchronizing to the Transceiver; Conserving Battery Power; Manually Transmitting and Receiving; Testing the Distance between Clocks Used as Repeaters

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www.spectracomcorp.com / US +1.585.321.5800 1168-5001-0050 Rev. H, Copyright June, 2011
Spectracom Corporation: 1565 Jefferson Road, Rochester, NY 14623 4 of 19
2.5.1 Synchronizing to the Transceiver
1. Install the transceiver.
2. Pick the location of the display clock(s).
3. Place each display clock in a location where the signal is
available from the transceiver. In order to verify that the
clock is receiving a signal from the transceiver, power up
the clock. (This can be done simply by removing the
clock’s battery cover, installing two D-cell batteries, and
replacing the battery cover.) The display clock should
indicate the transceiver’s transmitted time within five
minutes of power-up. If the clock does not correct to the
transceiver time, choose a different location for the clock.
4. Repeat steps 2 and 3 for each display clock. Remember as
you test each clock that display clocks can receive and
repeat signals from and to each other, not just from the
transceiver unit.
NOTE: The transceiver transmits once per minute. Battery-
powered wireless analog clocks transmit once every two
hours in normal mode and once every four hours in
economy mode. Refer to Conserving Battery Power to
toggle economy mode.
2.5.2 Conserving Battery Power
To toggle economy mode, press Switch #1 and Switch #2 (on the
back of the clock) simultaneously. When in economy mode, the
diagnostic LED will illuminate solid green for one minute and the
second hand will move to numeral 8. When in normal mode, the
diagnostic will illuminate solid red for one minute and the second
hand will move to numeral 5.
2.5.3 Manually Transmitting and Receiving
To synchronize display clocks after initial installation, you may wish
to send or receive time signals manually:
Pressing Switch #2 twice in rapid succession will enable the receiver
manually for ten minutes, allowing the clock to receive the time
signal. The second hand will move to the 20 second location until
the signal is received. The clock will then resume normal operation.
Pressing Switch #2 once will enable the clock transceiver for ten
minutes, allowing the clock to transmit the time signal. The clock
transceiver can be enabled only if the clock has received a time
signal within the last 12 hours. In this case, the second hand will
move to the 40 second location. The clock will resume normal
operation after ten minutes.
2.5.4 Testing the Distance Between Clocks Used as Repeaters
If display clocks distributed through a facility or across a campus are
too far apart, they may fail to transmit/repeat time to each other. If
during installation all clocks do not correct for the transceiver’s time,
find the corrected, synchronized clock closest to the first
unsynchronized clock. Press Switch #2 on the synchronized clock.
The second hand should move to 40 seconds and the clock should
stop running. This indicates that the synchronized clock is now in
transmission mode.
Go to the unsynchronized clock and press Switch #2. The second
hand should move to 20 seconds until the unsynchronized clock
receives the signal from transmitting, synchronized clock. The
previously unsynchronized clock should correct for the synchronized
time within five minutes. Within ten minutes, the first clock (the clock
used to transmit time) should resume normal operation.
Continue this troubleshooting process with all clocks that failed to
correct for the transceiver’s transmitted time. Remember that while
one clock is transmitting, you may synchronize multiple display
clocks within range of receiving the transmitted signal. Each clock
you synchronize as you move farther away from the transceiver
extends the range at which you can synchronize more clocks.