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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 .

..,..10-

Glenn Sim HC

Casio TM-100 User Manual

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