Philips Avalon CTS M2720A, Service Manual

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Frequency Bands 10 Specifications
89
Frequency Bands
Frontends
Modulation type Analog frequency modulation (frequency range depends on
frontend board)
Digital FSK 1.6kHz and 2.4kHz
Frequency Bands
Frequency Range Major countries
420 to 430 MHz, of which the following sub-ranges
are used:
– Band 1: 420.0625 to 421.0125 MHz
– Band 2: 424.5000 to 425.9500 MHz
– Band 3: 429.2625 to 429.7125 MHz
Japan
433.0500 to 434.7900 MHz Most European countries, Singapore (ISM band)
441.7500 to 441.9750 MHz Norway
This is the default ten-channel band within the ISM band approved by
the local authorities. Other channels (for transducers using specific
fixed frequencies within the ISM band) may additionally be approved for
use. Contact Philips Support for further information.
608.0125 to 613.9875 MHz US medical telemetry (WMTS) band, Canada, Australia and New Zea-
land
Frontends
US Frontend US Intensity Peak-negative acoustic pressure p
_
= (27.4 ± 4.6) kPa
Output beam intensity
(= temporal average power/area) I
ob
= (2.64 ± 0.83) mW/cm
2
Spatial-peak temporal average intensity I
spta
= (7.0 ± 2.3) mW/cm
2
US Frequency 1 MHz
US Signal range 3.5

Vpp to 350

Vpp @ 200 Hz
US Burst Repetition Rate 3.2 kHz
US LF Frequency Passband 110 to 450 Hz ± 20%
FMP Signal Range (rti) 200

Vpp to 40 mVpp
FMP Frequency Passband 10 to 90 Hz ± 20%
TOCO Frontend Signal Range 0 to 127 units
Offset Compensation (offset adjust at the fetal monitor) +100 to -200 units
Measurement Range -100 to 300 units
Resolution 0.25 units
Sensitivty 2.5g/unit (0.1 oz/unit)
Baseline Drift due to Temperature Changes 1 unit/min/°C (free air)
5 units/min/°C (underwater)
Transducer Specifications