Oregon JMR838WFA USER MANUAL

WEATHER FORECAST RF WALL CLOCK

WITH ROMO TE THERMOMETER

JMR838WFA

Instruction Manual

INTRODUCTION

Congratulations for purchase of the Weather Forecast RF Wall
Clock with Remote Thermometer (JMR838WFA).

The JMR838WFA is designed to receive RF signals generated by
the US Atomic Clock, one of the world's most accurate timekeepers.
Each time the JMR838WFA receives this signal, the current time
and date is synchronized with the US Atomic Clock.

the JMR838WFA also displays outdoor and indoor temperature
and uses barometric information to indicate weather forecasts
and atmospheric pressure trends.

Included in this package is a remote thermo-sensor. Place the
thermo-sensor in a sheltered outdoor location within a 30 meters
(100 feet) radius of the main unit and it will transmit outdoor
temperature readings to the JMR838WFA.

Other features include a daily crescendo alarm with an eight­minute snooze function and an extra-large LCD display.

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DESCRIPTION OF PARTS

A MAIN UNIT

A1 Extra-large liquid crystal display (LCD)

• Displays the time, date and weekday

• Alarm status, and alarm-set time

• Weather forecast and pressure trend

• In/outdoor temperatures in ºF

A2 [

] Radio-reception signal

Indicates the strength of RF signal reception

A3 [

] Alarm-on icon

Appears when the alarm is activated

A4 [

A5 [ ] Battery-low indicator

A6 [ ] Battery-low indicator (remote sensor)

A7 Trend indicator

A8 Weather-forecast icons

] Alarm icon

Appears when the alarm time is displayed

Apprears when the battery power is low

Apprears when the remote-sensor battery power is low

Indicates the trend of barometric pressure changes

Displays Weather forecasts as sunny, partly cloudy,
cloudy, rainy or snow

A9 [ ((

Activates the snooze function

A10 [

CLOCK

Toggles between “seconds” and “weekday” displays or
activates the calendar-clock setting mode

A11 [

Increases the value of a setting

A12 [

ALARM

Displays the alarm-time or sets the alarm time and status

A13 [

ZONE

Sequences through the 4 US time-zone choices of Pacific,
Mountain, Central and Eastern

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SNOOZE

] button

] UP button

] button

] button

)) ] button

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A14 [

Alternates between indoor and outdoor temperature
displays and activates auto-search for thermo signal

A15 [

Resets the unit by returning all settings to their default
values

A16 Battery Compartment

Accommodates four UM4 or AAA-size batteries (included)

A17 Table Stand

For placing the unit on a flat surface

A18 Wall-Mount Hole

For mounting the unit on a wall

THERMO

RESET

] button

] Button

B REMOTE THERMO SENSOR

B1 LCD

Displays the current temperature monitored by the remote
unit

B2 LED indicator

Flashes when the remote unit transmits data to the main
display unit

B3 °C/°F slide switch

Selects between Centigrade (°C) and Fahrenheit (°F)

B4 [ ] Battery-low indicator

Appears when the battery power is low

B5 Reset button

Returns all settings to default values

B6 Battery compartment

Accommodates two UM-3 or AA size alkaline batteries
(included)

B7 Battery door
B8 Wall-mount holder

Use to mount remote sensor on a wall

B9 Removable table-stand

For standing the remote unit on a flat surface

BATTERY INSTALLATION AND REMOTE

THERMO-SENSOR SETUP

Follow this step-by-step procedure for installing batteries and
setting up the remote-sensor unit. Successful setup should ensure
that temperature signals are properly received.

Note: The effective range may be limited by building
materials and the position of either the main unit or the
remote thermo-sensor unit. Try various set-up
arrangements for best result.

Setting up the thermo-sensor unit:

1. Position the remote sensor within the signal transmission
range of the main display unit. The maximum transmission
range is 100 feet (30 metres).

2. Remove the screws of the battery door on the remote thermo­sensor unit.

3. Select display of temperature in either °C or °F using the
°C/°F slide switch.

4. Install into the thermo-sensor unit, two UM-3 or “AA” size

1.5V alkaline batteries strictly according to the polarities
shown.

5. Replace the battery compartment door and secure its screws.

Note: Though the sensor is splash proof and is meant for
use outside, it should be placed away from direct sunlight,
rain, or snow.

Once the batteries have been inserted into the remote thermo­sensor unit, batteries can now be inserted into the main unit.

The JMR838WFA (main unit) requires four UM4 or “AAA” size
batteries for operation.

How to insert batteries into the main unit:

1. Press the door tab and click-open the door.

2. Insert the batteries strictly according to the polarities shown
therein.

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3. Replace the door so that it clicks into place.

Note: If not disposed of properly, batteries can be
harmful. Protect the environment by taking
exhausted batteries to authorized disposal stations.

Note: [
Replace the batteries when the battery-low indicator lights

] Battery-low indicator

up.

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Note: When the JMR838WFA is new and just out of the box,
initial signal reception can take up to 72 hours. It is
recommended that the JMR838WFA be placed on a window
sill away from a TV, PC, radio, microwave or other
equipment that generates RF signals. Interference to signal
reception is lowest between midnight and 4AM.

“SECONDS” AND “WEEKDAY” DISPLAY

The “second” and the “weekday” share the same section of the
display.

“weekday” display

ABOUT RADIO RECEPTION

The JMR838WFA is a radio frequency (RF) controlled clock. It
will automatically synchronize current time and date with the US
Atomic Clock. The benefit of a RF controlled clock is that highly­accurate time is maintained and manual adjustments to the time
and date are not required.

When the batteries are first installed, the JMR838WFA will
automatically search for a radio signal.

When in search mode, the antenna icon [
process takes between two to ten minutes. After initial search,
short periodic reception-signal scans will commence several
times a day.

The antenna icon indicates the strength of reception.

Interference

Reception can be affected by a number of factors. For best reception,
place the device away from metal objects and electrical appliances.

] will blink. This

STRONG

WEAK

NO RECEPTION

RECEIVING

“second” display

The weekday is displayed as an abbreviation in 3 languages.

Language

English

French

Spanish

Monday Tuesday Wed. Thursday Friday Saturda y Sunday

Day-of-the-week

To change the “seconds” display to the “weekday” display:

1. When the “seconds” are displayed, press CLOCK once.

To change the “weekday” display to the “seconds” display:

1. When the “weekday” is displayed, press CLOCK once.

CALENDAR AND ALARM TIME DISPLAY

The calendar and the alarm-time share the same section of the
display.

The calendar is displayed in a month-day format.

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calendar mode

To set the alarm-time:

1. Press and hold ALARM for two seconds, the alarm time will
flash.

2. Press [
press ALARM and proceed to the minute digits.

3. Again, press [

ALARM to confirm. The alarm is now automatically
activated.

To deactivate the alarm, press ALARM once.

] to enter a value for the hour digits. To confirm,

] to enter a value for the minute digits. Press

alarm mode

To change the calendar display to the alarm-time display:

2. When the calendar is displayed, press ALARM once.

To change the alarm-time display to the calendar display:

2. When the alarm time is displayed, press CLOCK once.

HOW TO SET THE CALENDAR CLOCK

MANUALLY

Under certain circumstances, the user may wish to set the
JMR838WFA manually. To set the JMR838WFA manually, follow
the procedures below:

Note: The RF controlled mechanism overrides manual
settings. If manual settings are made, the clock will
periodically adjust the time to what is indicated by the
radio signal.

To manually set the clock:

1. Press CLOCK and hold for two seconds. The hour digits will

start to flash.

2. Enter the correct month using the [

rapidly increase the value.

3. Press CLOCK to confirm and proceed to set the minutes.
Again, use the [

4. Press CLOCK to confirm and proceed to enter the year, current
month and day.

5. Next, select a language for the weekday. To choose a language
press [ ] button.

6. When finished, press CLOCK. The time and date are now set.

] button to select the correct minutes.

] button. Hold to

ALARM AND SNOOZE FUNCTION

When the alarm function is active, the unit will sound at the set
time.

With the crescendo function, the alarm initially starts gently and
increases in intensity in three stages. Without interruption, the
alarm will activate for two minutes.

To stop the alarm, press any key. However, if the [ ((
is pressed, the snooze function will be triggered. The alarm will
stop for eight minutes before it activates again.

SNOOZE

)) ]

TEMPERATURE DISPLAY

The JMR838WFA displays temperature in Fahrenheit (°F). A
user-select option lets the user choose between indoor and outdoor
display.

indoor temperature display

outdoor temperature display

Press THERMO to alternate between the temperature displays.
The outdoor temperature display has a kinetic-way display.
The kinetic-wave display shows the signal-receiving status by

the main unit. The are three different signal status icons.

TO SET AND ACTIVATE THE ALARM

The calendar display and the alarm display share the same section
of the display.

The unit is in searching mode.

Temperature readings are
securely registered.

No signals.

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SENSOR TRANSMITION STATUS

If blanks "----" appear on the outdoor temperature display of the
main, the unit is not receiving a signal from the remote thermo
sensor. The user may be able to receive a signal by forcing a
signal search.

To force a remote sensor signal:

Press and hold THERMO for two seconds. The unit will search
for a remote thermo-sensor signal.

Search mode will last for about sixty seconds. If the unit still
cannot receive a signal, check the batteries to ensure they are
properly installed and have ample power. Try repositioning the
units as they may be having temperature transmission block as a
result of interference.

Note:

Reasons for not receiving a signal from the remote thermo
sensor may include:

1. The batteries of the remote sensor, the main unit, or
both may be low. Battery-low icons should indicate that
battery power is low and the batteries require changing.

• When the temperature falls below freezing point, the

batteries will freeze. Frozen batteries will have a
lower voltage and result in a lower transmission
radius.

2. The transmission range is too far.

• Shorten the distance.

3. The transmission path is cluttered with obstacles and
interference.

• Shorten the distance or reposition the remote sensor

or the main unit.

WEATHER FORECAST FUNCTION

The JMR838WFA detects barometric pressure changes and
displays the illustrated weather symbols that indicate weather
forecasts for 12 to 24 hours in the future. The radius of the
forecast is approximately 30 - 50 km (18 - 31 miles).

Slightly

Sunny Cloudy Rainy Snow

Cloudy

Important:

1. The accuracy of a weather forecast, when only using
pressure trends, is approximately 70 to 75 percent.

2. The weather forecast symbols may not reflect current
weather condition. The symbols are forecasting the
future.

3. A ‘SUNNY’ forecast covering the nighttime reflects fine
clear weather.

HOW TO RESET THE UNIT

Press RESET to return all settings to the factory values.

NOTE: Pressing RESET will clear all user selected or
programmed settings.

HOW TO WALL MOUNT OR

USE TABLE STAND

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HOW TO READ THE PRESSURE TREND

The JMR838WFA gives a barometric pressure trend for the last
hour. As illustrated below, a rising trend (arrow) indicates
improving weather. Deteriorating weather conditions are indicated
with a falling trend (arrow).

Arrow

Indicator

Pressure

Trend

Rising Steady Falling

MAIN UNIT

Flip the table stand open to place the unit on a steady, flat surface.
Or use the recessed hole on the back to mount it on a wall.

Wall-mount Table Stand

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REMOTE THERMO SENSOR

This sensor comes with a wall-mount holder and a removable
stand. Use either to hold the unit in place.

Wall-mount Table Stand

MAINTENANCE

The JMR838WFA will give you many years of service if treated
properly. Please follow these care instructions:

1. Do not immerse the unit in water. If the unit comes in contact
with water, dry it immediately with a soft lint-free cloth.

2. Do not clean the unit with abrasive or corrosive materials.
Abrasive cleaning agents may scratch the plastic parts and
corrode the electronic circuit.

3. Do not subject the unit to excessive: force, shock, dust,
temperature, or humidity. Such treatment may result in
malfunction, a shorter electronic life span, damaged batteries,
or distorted parts.

4. Do not tamper with the unit’s internal components. Doing so
will terminate the unit’s warranty and may cause damage. The
unit contains no user-serviceable parts.

5. Only use new batteries as specified in this instruction manual.
Do not mix new and old batteries as the old batteries may leak.
Batteries contain dangerous chemicals and may explode or
leak and cause injuries if old and new batteries are used
together, are inserted improperly or are improperly disposed
of. Always use caution when using or disposing of batteries.

6. Read this instruction manual thoroughly before operating
the unit.

SPECIFICATIONS

Clock Time : 12-hour format
Alarm Duration : 2-minute crescendo
Snooze : 8 minutes
Accuracy : +/- 0.5 second/day

( In manual set quartz clock mode)

General specification

Battery Type : Four pieces of UM4 or “AAA” size

1.5V alkaline battery

LCD Dimension : Viewing area - 155 x 107 mm

6.2" x 4.28"

Unit Dimension : 267 x 204 x 36 mm

10.68" x 8.16" x 1.44"
(H x W x D)

Unit Weight : Approx. 660 g (23.1 ounces)

(not including batteries)

Temperature Measurement

Operating Temperature : -5°C to 50°C (23.0°F to 122°F)
Temperature Resolution : 0.1°C to (0.2°F)

REMOTE THERMO SENSOR

Proposed operating range : -20.0°C to +60.0°C

(-4.0°F to 140.0°F)
Temperature resolution : 0.1°C (0.2°F)
RF Transmission : 433 MHz

Frequency
RF Transmission Range : Maximum 30 meters (100 feet)
Temperature sensing : Approximately 30 seconds

cycle
Power : Two pieces of UM-3 or “AA” size

1.5V alkaline battery

Weight : 100gm (3.5 ounces)

(without batteries)
Dimension : 105 x 70 x 22 mm

4.2" x 2.8" x 0.88"

(H x W x D)

MAIN UNIT

Clock Functions

Radio Control : Auto synchronization of

current time and date with the
US Atomic Clock

Calendar : Weekday in English / Spanish /

French
Current month / day format

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NOTE ON COMPLIANCE

Warning: Changes or modifications to this unit not expressly

approved by the party responsible for compliance could void the
user’s authority to operate the equipment.

FCC :
NOTE: This equipment has been tested and found to comply

with the limits for a Class B 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 of the receiver which the receiver is needed.

! Consult the dealer of an experienced radio/TV technician for

help.

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CUSTOMER ASSISTANCE

Should you require assistance regarding this product and its
operation, please contact our customer care department at 800­853-8883 or by email at [e-mail]. Our customer
care department is available 24-7-365.

WARRANTY

This product is warranted to be free of manufacturing defects for
a period of 90-days from date of retail purchase. Defective
product should be directed to the place of retail purchase for
replacment. If this is not possible, contact our customer care
department for assistance and a return material authorization. No
returns may be made without a return material authorization.
Please retain your retail receipt as you may be asked to provide a
copy of the receipt for proof of date purchased.

CAUTION

— The content of this manual is subject to change without

further notice.

— Due to printing limitation, the displays shown in this

manual may differ from the actual display.

— The contents of this manual may not be reproduced

without the permission of the manufacturer.

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