T
RANSMITTER
O
PERATION
Time Synchronization
Once the transmitter has received its time, from either a GPS Receiver, NTP time source or another transmitter, it sets its
internal clock. It then transmits time information or schedules via a wireless radio signal to the wireless clocks, bells, and
other devices in the system. As a result, the system clocks, bells, and other devices are precisely synchronized to each
other and all time, schedules, and events are kept current.
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Time Source:
The transmitter has its time synchronized by a GPS Receiver or a NTP server and then broadcasts
that time and event schedules to clocks and other devices. The transmitter operates on channels with 12.5KHz
bandwidths and 68MHz frequency and is preset to one of the channels licensed by the OFCOM to minimize
interference on these frequencies and channels.
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Transmit Schedule - External Antenna Model Only
: The transmitter broadcasts its synchronized time to the
system clocks and devices from the 39th to the 6th minute of the next hour and changes to a standby mode
during the 7th to the 38th minute of the hour (standard broadcast schedule). During initial power-up, the
transmitter broadcasts for 8 consecutive hours. After the 8 hour power-up period, the transmitter reverts to the
standard broadcast schedule.
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Lightning Arrester - 5 Watt and 30 Watt Models Only:
The transmitter lightning arrester is housed inside the
enclosure and helps protect the transmitter and amplifier from lightning damage during severe weather.
However, we cannot guarantee that all damage will be prevented even with the lightning arrester installed.
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High Power Amplifier - 5 Watt and 30 Watt Models Only:
The 5 watt transmitter model increases the output
power of the base transmitter by utilizing a high power amplifier. The amplifier is housed in the transmitter's
industrial style enclosure for safety reasons. Transmitter includes an externally mounted antenna and an RF
power amplifier that increases the output power, allowing it to transmit a greater distance.
Power Up Transmitter
When the transmitter is plugged into the wall the front display lights up. The green, yellow, and red LED lights turn on for
2 seconds as a test, then the LEDs turn off. The green light will turn on to show that the transmitter is broadcasting.
The display initially shows the time as 12:00:00 and the software version. Then the transmitter checks the position of the
switches on the back of the transmitter and stores their settings in memory. The transmitter completes an initialization
sequence with its time source which could be either a GPS receiver, Satellite Transmitter, or NTP time source.
Power Failure
Once the transmitter has been powered up for a few hours it is capable of keeping track of time off its internal backup
power for up to 8 hours. During a power failure the transmitter will continue to track time with the last valid time signal
that it received. Once the power had been restored the transmitter will begin to broadcast (even without a valid time
signal) to the down-stream components.
The system has a fail-safe design. If the failure of a system component or power loss to a component occurs, all down-
stream components will continue normal operations using their own internal time base. If after a specified period of time
communication has not been restored, a visual indicator that notifies the user of a loss of communication appears and
remains until communication is restored. Examples: Yellowflashing LED on the transmitter; flashing colons on LED digital
clocks; stepping of second hand on analog clocks.
NOTE:
In the event of a facility-wide power outage, upon power restoration, transmitters using scheduled
transmission will broadcast continuously for 8 hours, synchronizing all the Primex Wireless products
throughout your facility.
Primex Wireless
UK 1/2 and 5 Watt Transmitter - External Antenna Installation & User Guide
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