Casio TM-100 Manual de servicio y lista de piezas - Página 11
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Radio field strength becomes strong in the following cases.
o Field strength is induced around a conductive object near the TM-l 00.
o Areas close to the water
o The TM-l00 is being operated at a high altitude.
C.
Transmission techniques for the TM-l00
The radio wave produced by the TM-l 00 is very weak, and the antenna is also so short that it
can be retracted into the watch case. This means that it is far shorter than a conventional
rod
antenna ..
The antenna is so designed that variations in the radio field strength will occur depending on the
direction
in which the person holding the TM-l 00 faces or the position of his wrist at which the
TM-l00 is worn.
Example:
When the person holding the TM-l 00 turns his back toward the receiving station,
reception will be better, since directivity is produced in the backward direction.
Also, variations in the radio field strength will be caused by the height of the
person holding the TM-l 00.
(When the holder bends forward, a similar result is obtained.)
Like other transmitters,
the distance travelled by radio waves will differ according to the voice
input level through a microphone.
If the voice input level is lower and the communication
distance is longer, the articulation
of
speech will be reduced.
When a microphone
is positioned too close to the speaker's mouth, the
sound will be distorted.
Keep your mouth 5 to 8 em off the microphone
and speak in at the
proper input level.
Note:
Never attempt to increase the power of the transmitter
by altering the internal circuitry
or extending the antenna.
Doing so may be violation of local laws governing the use of
radio transmitters.
D.
Receiving techniques
by radio sets
To increase the transmission
range without violating of local laws, radio set performance
also
needs to be improved.
o Connect a high-performance
antenna to the radio antenna.
o Attach an FM receiving amplifier sold on the market.
By adjusting the direction of the receiving antenna, the best receiving effect can be obtained .
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