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Connection
The Precision CLOCK has a Sub-D (female, 9-pin) connector. Please connect it to a free serial interface (COM-Port)of your PC. Please note, that the Precision CLOCK is not able to work at a COM port with IRQ sharing.
As standard PCs e.g. COM1 and COM3 both run with IRQ4. You must assign an exclusive IRQ to the selected COM port,
which the Precision CLOCK is connected to.
Connection
via Sub-D connector (RS232 COM port).
Positioning
Positioning is very important for the best use of your receiver. A good position is characterised by a permanentgood signal. By receiving the signal in such high quality, your Computer will be synchronised very often
with the official time.
The signal is transmitted as a short wave signal with 60 kHz. Due to the nature of short wave signals, it can easily be disturbed:
Electronic equipment is often the reason for signal disturbance.
So - first of all - do not position the Precision Clock near monitors, printers, fax machines, photocopiers etc ...
take
distance from electronical equipment
We recommend to find the best position for the receiver by following
the instructions below:
Connect the PrecisionCLOCK to a serial port of your PC. Then start the
Precision CLOCK driver software and select the corresponding COM port
in the driver panel. Now the LED of the Precision CLOCK should
blink (red light). Now move the receiver to different location and
look for a position
where the LED of the receiver blinks constantly (once per second).
Don't forget to rotate the receiver, because (theoretically) you will have
the best signal reception, if the Precision CLOCK lies at right angles to
the radio signal waves from MFS transmitting station (which is located
in
Teddington, Middlesex).
At least you should check the signal quality by looking at the 'quality
history' shown by the driver software. It has to be around 100 %.
What can I do, if signal is disturbed ?
In case that the signal is disturbed, try to find out about the origin
of the signal noise. Therefore switch your other electronic equipment off
- one after the other - and check the LED of the receiver each time.
Very often disturbance is caused by a monitor. The most critical
parameter of the monitor is the line frequency.
Please make sure that the line frequency is not set to 60 kHz,
because this would disturb the MFS signal in the surrounding 10 meters
or even in longer distances. The only way to change the line frequency
of your monitor is to modify the refresh rate or display mode.
Both parameters are changeable in the settings of your graphic adapter
(see Windows control panel).
What else can I do ?
Another way is to find a new position for your receiver at greater distance
from the origin of the signal noise. Therefore you can easily extend
the cable length up to 100 meters. A standard serial cable extension
can be used.