Creative i300 - TravelSound MP3 Players Manuel d'utilisateur télécharger pdf (Page 16)

ETSI

ETSI TR 102 626 V1.1.1 (2009

08)

A.3 Sharing and compatibility studies

A.3.1 Test Plan Testing of Digital TVs for interference levels from

CB radios

A.3.1.a TV sets immunity test with a 27 MHz CB signal

A.3.1.b Laboratory test

A.3.1.c Measurement method and test conditions

Three different Digital television sets were be used.

A Digital Video Broadcast (DVB) generator was be used to provide a TV signal of 60 dBµV (-49 dBm)in Bands IV-V.

The 27 MHz generator was AM modulated to a depth of 80 % by a 1 kHz AF signal as prescribed in EN 55020 [i.14].

The test was repeated using FM modulation using ±5 kHz deviation.

Care was taken to minimize generation of 27 MHz harmonics.

The evaluation of the observed picture degradation were be set up in accordance with ITU-R Recommendation

BT.500-7 [i.15]. The 27 MHz RF levels causing perceptible picture degradation were be recorded.

The following tests were be carried out:

• Internal immunity in differential mode (normal conduction).

• Internal immunity in common mode.

DVB TV

Generator

Variable Gain

Amplifier

Low Pass

Filter

Coupling 27 MHz RF

Generator

TV set

10 cm

Ground Plane

Figure A.1: Immunity test layout in laboratory

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Creative i300 - TravelSound MP3 Players Manuel d'utilisateur Page 16