Oregon Scientific JMR838WFA User manual

1
GB
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 eight-
minute snooze function and an extra-large LCD display.
DESCRIPTION OF PARTS
AMAIN 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 [ ] Alarm icon
Appears when the alarm time is displayed
A5 [ ] Battery-low indicator
Apprears when the battery power is low
A6 [ ] Battery-low indicator (remote sensor)
Apprears when the remote-sensor battery power is low
A7 Trend indicator
Indicates the trend of barometric pressure changes
A8 Weather-forecast icons
Displays Weather forecasts as sunny, partly cloudy,
cloudy, rainy or snow
WEATHER FORECAST RF WALL CLOCK
WITH ROMOTETHERMOMETER
JMR838WFA
Instruction Manual
A9 [ (( SNOOZE )) ] button
Activates the snooze function
A10 [ CLOCK ] button
Toggles between “seconds” and “weekday” displays or
activates the calendar-clock setting mode
A11 [ ] UP button
Increases the value of a setting
A12 [ ALARM ] button
Displays the alarm-time or sets the alarm time and status
A13 [ ZONE ] button
Sequences through the 4 US time-zone choices of Pacific,
Mountain, Central and Eastern

2
GB
A14 [ THERMO ] button
Alternates between indoor and outdoor temperature
displays and activates auto-search for thermo signal
A15 [ RESET ] Button
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
BREMOTE 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 thermo-
sensor 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 thermo-
sensor 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.

3
GB
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: [
] Battery-low indicator
Replace the batteries when the battery-low indicator lights
up.
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 highly-
accurate 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 [ ] will blink. This
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.
STRONG
WEAK
NORECEPTION
RECEIVING
Interference
Reception can be affected by a number of factors. For best reception,
place the device away from metal objects and electrical appliances.
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
“second” display
The weekday is displayed as an abbreviation in 3 languages.
Day-of-the-week
Language Monday Tuesday Wed. Thursday Friday Saturday Sunday
English
French
Spanish
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.

4
GB
calendar mode
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 [ ] button. Hold to
rapidly increase the value.
3. Press CLOCK to confirm and proceed to set the minutes.
Again, use the [ ] button to select the correct minutes.
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.
TO SET AND ACTIVATE THE ALARM
The calendar display and the alarm display share the same section
of the display.
To set the alarm-time:
1. Press and hold ALARM for two seconds, the alarm time will
flash.
2. Press [ ] to enter a value for the hour digits. To confirm,
press ALARM and proceed to the minute digits.
3. Again, press [ ] to enter a value for the minute digits. Press
ALARM to confirm. The alarm is now automatically
activated.
To deactivate the alarm, press ALARM once.
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 [ (( SNOOZE )) ]
is pressed, the snooze function will be triggered. The alarm will
stop for eight minutes before it activates again.
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.
The unit is in searching mode.
Temperature readings are
securely registered.
No signals.

5
GB
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.
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).
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).
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
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
Arrow
Indicator
Pressure
Trend Rising Steady Falling
Sunny Cloudy Rainy Snow
Slightly
Cloudy

6
GB
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
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
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)

7
GB
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.
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.
CUSTOMER ASSISTANCE
Should you require assistance regarding this product and its
operation, please contact our customer care department at 800-
853-8883 or by email at [email protected]. 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.