Casio 2581 Manuale d'uso

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USER'S GUIDE 2581/2671

MA0302-A

How a Radio-controlled Watch Works

What is a radio-controlled watch?

Your radio-controlled watch is designed to receive a time

calibration signal that contains standard time data and adjust its

current time setting accordingly

Signal received using

built-in antenna.

Transmitter

Long-wave time

calibration signal

Watch decodes

received data

and converts it

Signal data

to time data.

Decoding

Time is

Time data

adjusted

Cesium

according to

Inside the watch

Watch

atomic clock

time data.

After the watch receives the Standard

T i me signal, it

performs internal calculations to determine the current time.

Because of this, there may be an error of up to one second

in the displayed time.

Location

Reception is dif

ficult and may even be impossible in the locations

described below

. A void such locations when performing signal

reception.

You should think of your watch operating like a radio or

TV when it

is receiving the calibration signal.

Among or near buildings

Near high-voltage lines

Next to a household

Inside a vehicle

appliance or office equipment

(automobile, train, plane, etc.)

(TV, speaker, fax, PC, etc.)

In a location where there is

Near mountains

radio interference

(construction site, airport, etc.)

If you are experiencing problems with reception, move away from

the types of locations described above to a location with better

reception, and try again.

Calibration Signal

The Japanese calibration signal (Call Sign: JJY) is maintained by

the independent Japan Ministry of Posts and

T elecommunications

Communication Research Laboratory (CRL). It is a long wave

signal transmitted 24 hours a day from the Mt. Otakadoya

transmitter (40kHz) located in

T amura-gun, Fukushima Prefecture,

and from the Mt. Hagane transmitter (60kHz) located on the

border between Saga Prefecture and Fukuoka Prefecture.

The U.S. calibration signal (Call Sign: WWVB) is transmitted by

the National Institute of Standards and technology from Fort

Collins, Colorado.

Though the calibration signal is normally transmitted 24 hours

a day

, transmission may be interrupted occasionally due to

maintenance, lightening, etc.

Receiving the Calibration Signal

There are two methods you can use to receive the time calibration

signal.

Auto reception (Reception is performed automatically at 2:00,

4:00, and 6:00 each morning.)

Manual reception (Y

ou initiate reception using a button

operation.)

The watch is set up for auto reception at the factory

, so all you

need to do is to place it in a location that allows good reception

each night.

Setting Up to Make Reception Easier

Remove the watch from your wrist and place it somewhere so its top

(12 o'clock side, where the antenna is located) is facing

approximately in the direction of the signal transmitter

. Keep the

watch away from metal objects.

Resin band

Metal band

Orienting the watch so it is sideways to the transmitter makes it

more dif

ficult to receive the signal.

Do not move the watch while it is receiving the calibration signal.

The following explanation covers the radio-controlled timekeeping function only.

For other functions, go to the download page for Module 2578,

which is the export model that has the same functions, except for radio-controlled timekeeping.

Reception Range

This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB).

The signa

received depends on the current Home City setting.

When this Home City is selected:

Transmitter Locations

500km

Mt. Hagane

(60kHz)

1000km

Under optimum conditions, the calibration signal should be

receivable up to 1,000 kilometers from the transmitter

. Note

that the wave is relatively weak at distances greater than

500km, so reception may be poor at long distances.

Geographic contours, nearby buildings, the season, and the time of day can make reception impossible even when you are within range of

the transmitter.

Best reception is possible late at night.

Time Required for Reception

Signal reception takes anywhere from about two to six minutes.

Note that when "A/T" (auto) is specified as the transmitter

selection mode, signal reception can take up to 12 minutes.

* See "Specifying the Transmitter Selection Mode in Japan" for

more information.

Triggering Reception Manually

In the

T i mekeeping Mode:

Hold down the B B B B B button for

about two seconds.

The watch beeps and reception

starts. Ongoing reception is

indicated by the

icon and the

receive indicator

. See "Receive Icon

and Indicator" for more information.

To interrupt reception

Press the B B B B B button.

All other buttons besides B are disabled during signal reception.

When reception is successful

The watch adjusts its current time setting, and then beeps and

displays the time and date of the adjustment.

The

icon and the receive indicator remain on the display to

indicate that reception was successful.

When reception fails

The watch does not adjust its current time setting, and displays

"ERR" instead.

The display also return to the normal timekeeping screen

automatically if you do not perform any operation for about one

or two minutes.

You can receive this signal

Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)

Fort Collins, Colorado signal

1000km

Transmitter Location

1000km

Mt. Otakadoya

(40kHz)

Fort Collins

Under optimum conditions, the calibration signal should be

receivable up to 3,000 kilometers from the transmitter. Note

that the wave is relatively weak at distances greater than

1,000km, so reception may be poor at long distances.

Receive Icon and Indicator

While reception is in progress, the

icon and the receive indicator

cycle from "Unstable" through

"Stable" as shown below. How far

they cycle depends on the signal

strength. Keep the watch in a

location where reception is stable

while reception is in progress.

Unstable

Even under optimum reception conditions, it takes at least

10 seconds before reception starts.

Use the receive icon and receive indicator to check

reception status and to determine the best location for

signal reception.

Note that weather, the time of day, surroundings, and other

factors can all affect reception.

l that is

3000km

Receive indicator

Receive icon

Stable