National Geographic 264NE - Manual (Page 4)

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2.0 Troubleshooting
Press the RESET button at any time your display shows dashes (--.-°F) and/or ensure
that the remote sensor is in direct line to the monitor.
If the outdoor temperature cannot be received, check:
1. The distance between the monitor or remote sensor should be at least 0.9 to 1.2
meters away from any interfering sources such as computer monitors or TV sets.
2. Avoid placing the monitor onto or in the immediate proximity of metal window
frames.
3. Using other electrical products such as headphones or speakers operating on
the same signal frequency (433MHz) may prevent correct signal transmission and
reception.
4. Neighbours using electrical devices operating on the 433MHz signal frequency can
also cause interference.
5. Signals from other household devices, such as door bells and home security
systems, may temporarily interfere with the units and cause reception failure.
The transmission and reception of temperature reading will resume once the
interference has stopped.
The maximum transmission range is 45 meters from the remote sensor to the
monitor (in open space). However, this depends on the surrounding environment and
interference levels. The temperature signal travels in a straight line from the remote
sensor to the monitor. The signal will not curve around an object. If no reception is
possible, despite the observation of these factors, all units will have to be reset.
Note: to reset unit please see Set up Procedure (see Section 1.0).
3.0 Radio Controlled Clock (RCC)
The RCC has the most accurate time within the continent. This unit receives the time
signal transmitted by Physikalisch-Technische Bundesanstalt (PTB) of Germany, which
is regulated by 4 atomic clocks and in average deviates less than 1 second in 2 million
years.
PTB transmits the time signal (DCF77, 77.5kHz) continuously from Mainflingen, 25 km
southeast of Frankfurt (am Main). It is expected that the signal can cover a distance
of 2,000 km from the transmitter. However, some environmental effects may affect
the transmitting distance.
For more information please see www.ptb.de