Casio 2730 Instrukcja obsługi - Strona 3

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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

Calibration Signal

Watch decodes

received data and

Signal Data

converts it to time

data.

Decode

Time Data

Time is adjusted

Cesium

according to time

Atomic Clock

Internally

Watch

data.

After the watch receives the time calibration 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 difficult and may even be impossible in the locations

described below. Avoid 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

Inside a vehicle

Next to a household appliance

(automobile, train, plane, etc.)

or office equipment

(TV, speaker, fax, PC,

mobile phone, etc.)

In a location where there is

radio interference

(construction site, airport, etc.)

Near mountains

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.

Operation Guide 2730

Calibration Signal

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

the independent Japan Ministry of Posts and Telecommunications

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

signal transmitted 24 hours a day from the Mt. Otakadoya

transmitter (40kHz) located in Tamura-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 receive (Reception is performed automatically at

midnight, 1:00, 2:00, 3:00, and 4:00 each morning.)

• Manual receive (You initiate reception using a button operation.)

• If reception is not successful for any of the normal auto receive

times shown above, auto receive is performed one more time at

5:00 a.m.

• 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 it

away from metal objects.

Resin Band

Metal Band

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

more difficult to receive the signal.

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

Reception Range

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

received depends on the current Home City setting.

• For information about selecting a Home City, see "Setting the Time and Date Manually".

Home City

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

TYO

Fort Collins, Colorado signal

LAX, DEN, CHI, NYC

Transmitter Location

1000km

Mt. Otakadoya

500km

(40kHz)

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, the time of day, can even 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 "AT" is specified as the frequency selection mode,

signal reception can take up to 12 minutes.

• See "Specifying the Transmitter Selection Mode" for more

information.

Triggering Reception Manually

In the Timekeeping Mode, hold

down the D

D button for about

two seconds until the watch

beeps.

• This indicates that manual receive

has started. Ongoing reception is

indicated by the

icon and the

receive indicator.

Stopping Signal Reception

Press the D

D button.

• All other buttons besides D are disabled during signal reception.

When reception is successful

The watch terminates reception and adjusts the current time. Next

it beeps and then displays the date and time the adjustment was

performed.

• The

icon on the display also indicates successful signal reception.

• Following successful reception, the analog hands adjust

automatically to the digital time.

When reception fails

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

"ERR" instead.

• The display also returns to the normal timekeeping screen

automatically if you do not perform any operation for about one

or two minutes.

Transmitter

Transmitter Location

3000km

1000km

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

The receive indicator cycles from

"Unstable" through "Stable" as

shown below while reception is in

progress. How far it cycles depends

on the signal strength. Keep the

watch in a location where reception

isstable when it is in progress.

Unstable

Stable

• Even under optimum reception conditions, it can take about 10

seconds for reception to stabilize.

• Use the receive icon 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.

Analog Hands and Signal Reception

Second Hand

This hand moves to the 12 o'clock position when reception starts.

• It resumes normal movement after reception is complete.

• Pressing a button to stop reception causes the second

hand to move to the seconds count as kept by the digital

display and resume normal operation.

Hour and Minute Hand

These hands continue to operate normally.

Note that the second hand does not move while signal

reception is in progress.