PCM and FM are different products because they are analog methods. The digital telemetry type used by our company is introduced as direct spread spectrum as a format. The features of this method are that it is resistant to noise (since the waveform is modulated, correlated, and then restored), and the transmitting and receiving antennas can be separated. In the telemeter system DT-221T/DT-281R, the receiver unit (DT-281R) can be installed inside the car for ease of use. 

The response frequency is 200μsec, which is -3dB (30% of output) lower than the cutoff characteristic of the filter in the analog circuit. On the other hand, after A/D conversion, the sampling speed of the 6-component force transducer (SLW-ND/-NE) is 1 ms, so sampling is divided into 5 segments, resulting in a 19% error. Therefore, the response frequency after A/D conversion is about 100 Hz. 

The digital telemeter type 6-minute force load cell (SLW-ND/-NE) can be used for more than 6 hours with alkaline batteries: in the full temperature range -10 to +80°C (sensor part only). It is even longer at room temperature, and can be used for 10 hours with nickel-hydrogen batteries. The digital telemeter type wheel torque transducer (LTW-ND) can be used for 6 hours or more with alkaline batteries over the entire temperature range of -10 to +80°C (sensor part only). It is even longer at room temperature.