Hanyang Navicom RFCT 10 User Manual
RFCT-10 manual
Transmitter for wireless clock system
Contents
1 Description.................................................................................................................... 1
2 Initial Setup ................................................................................................................... 4
2.1 Preparation for setup.......................................................................................... 4
2.2 Setup ................................................................................................................... 4
3 Operation ...................................................................................................................... 6
3.1 Operation details.................................................................................................6
3.2 GPS Operation.....................................................................................................8
3.3 SNTP Operation ..................................................................................................9
4 Monitoring using PC ................................................................................................... 10
4.1 Preparation........................................................................................................10
4.2 Command...........................................................................................................11
5 LCD Menu using key pad............................................................................................ 17
5.1 Status ................................................................................................................17
5.2 Time ..................................................................................................................17
5.3 Reference.......................................................................................................... 18
5.4 Radio Frequency ...............................................................................................19
5.5 Init LCD .............................................................................................................20
FCC CONCERNS
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
- Consult the dealer or an experienced radio/TV technician for help.
RF Exposure Statement:
The antenna(s) used for this device must be installed to provide a separation distance of
at least 20 cm from all persons and must not be co-located or operating in conjunction
with any other antenna or transmitter.
Do not
Any changes or modifications to the equipment not expressly approved by
the party responsible for compliance co uld v oid u s er’s authority to operate
the equipment.
1 Description
Figure 1.1
The RFCT-10 receives a time from a GPS (global positioning system)
receiver or from a NTP (network time protocol) server via ethernet port.
Then the RFCT-10(time transmitter) broadcasts the time to remote wireless
clocks (time receiver of our company). As a result, all the wireless clocks are
synchronized to the exact time. This time synchronization system is ideal for
schools, universities, hospitals, and other applications in synchronizing time.
GPS Satellite
Wireless
Clock
GPS
Receiver
RFCT-10
Transmitter
Ethernet
Figure 1.2
Input, output and in-out ports are described as follows.
- Input port
¾ DC Power ( 9VDC )
1
¾ GPS Antenna port
¾ Key pad( 4x4 array)
- Output port
¾ RF Antenna port
- Input and output port
¾ RJ-45 RS232 PC Interface port
¾ Ethernet port
- Display output
¾ LED( REF, Alarm, Fault, PWR)
¾ LCD
- Accessory
¾ AC-DC Adaptor ( input:100-240VAC, output:9VDC/1.5A)
¾ GPS Antenna(GPS18LVC)
Figure 1.3 shows the input, output and in-output connection.
RFCT(Transmitter)
GPS
Ant.
NTP
Server
PC
AC/DC
Adaptor
Input:110~220V AC
Output: 9V DC
RS232
Ethernet
RS232
GPS port
72.1MHz~72.4MHz
30dBm(1W max.)
Ethernet
port
Monitor
Port
*Monitor port connector only
when being monitored.
FM
Figure 1.2
2
Figure 1.4 shows the block diagram of RFCT-10
GPS Antenna
NTP Server
internet
for connecting network time server(NTP) Server
GPS
Receiver
Port
RS232
Ethernet
Port
ethernet
PC
Monitor
port
110/220V – 9VDC
AC-DC
Adaptor
RS232
Processor block
Flash memory+SRAM)
TTL
Keypads
(uController+
TTL TTL
LCD LED
DC-DC
9V
Block
72MHz Narrow Band FM
Data 72MHz
5V
3.3V
7V
Modulator
Figure 1.4
Power
Amplifier
3
2 Initial Setup
2.1 Preparation for setup
z RFCT-10 Set
¾ Transmitter (RFCT-10 main body).
¾ AC-DC Adaptor power supply
¾ RF Transmitter Antenna
¾ GPS Antenna
z PC and monitoring cable( refer to 4.Monitoring using PC) : optional
2.2 Setup
2.2.1 Location
The first step in setting up the transmitter is to determine a suitable location for
the transmitter and GPS unit. The transmitter's power supply requires 120 Volts
AC so proximity within reach of the transformer cord is needed. It is
recommended that the transmitter be located a minimum of 2 to 3 feet above
the floor and away from large metal objects, such as lockers, filing cabinets,
etc. The transmitted signal from the antenna radiates in a circular and
‘umbrella ’ pattern, therefore the coverage for an area will be better if the
transmitter is centrally located. In multistory buildings, locating the transmitter
on the top floor will often significantly improve coverage for the lower floors
due to the umbrella ’ pattern of transmission.
The GPS antenna needs a clear view of the sky to receive the GPS signal. Only
the cable permanently attached to the GPS unit may be used outdoors. then
additional cable is required the connection must be sealed with Radio Shack
coaxial Cable Connector Sealant 278-1645 or high quality silicone sealant to
weatherproof the connection. Any cable extensions must be protected from
outside elements.
2.2.2 Assembly of the RFCT-10
1. Carefully screw the transmitter antenna onto the transmitter. The antenna
must be snug against the case but hand-tighten only.
2. Plug the GPS unit cable into the transmitter.
3. Attach the GPS unit to the inside of a window
4. Plug the supplied 9-volt/1.5 Amp DC power supply into the transmitter.
5. Plug in the supplied 9-volt/1.5 Ampere DC power supply into a 120 VAC
outlet.
6. Set all the parameter on the transmitter using key pad.
4
7. RFCT-10 setup is complete
5
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