Creative i300 - TravelSound MP3 Players Manuel d'utilisateur télécharger pdf (Page 35)

ETSI

ETSI TR 102 626 V1.1.1 (2009

08)

• As expected, it is confirmed that the AM and SSB modulations have the greatest interference potential,

however, at the RF powers requested, there was no indication of interference. Interference was only

experienced in the presence of RF power levels far exceeding those being considered in the present document.

• During differential mode testing, 2 UHF TV tuners broke down when applying extreme high input load to it

(estimated load value between 35 dBm to 40 dBm at receiver antenna input connector). Surprisingly, these two

devices could be used again during the following day due to "self-healing" over one night.

A.3.2 Test Plan Testing of Domestic and Vehicle Equipment for

interference levels from CB radios

Practical tests to:

• Long-Wave (LW) and Medium-Wave (MW) AM Broadcast receivers (domestic and vehicle-based);

• band II FM receivers (domestic and vehicle-based);

• Digital Audio Broadcast (DAB) receivers (domestic and vehicle-based); and

• a variety of domestic communications and audio devices.

Using CB radios utilizing 12 W PEP SSB and 4 W AM/FM modulation to:

• ascertain whether any interference was generated; and

• if so, what kind and under what circumstances, such that further studies may be made.

A.3.2.1 Testing of Domestic and Vehicle Equipment for interference levels

from CB radios

A.3.2.1.1 Introduction

The present clause displays the results of a brief practical study conducted to ascertain the interference potential of CB

radios utilizing 12 W PEP SSB and 4 W AM/FM modulation to:

• Long-Wave (LW) and Medium-Wave (MW) AM Broadcast receivers (domestic and vehicle-based);

• band II FM receivers (domestic and vehicle-based);

• Digital Audio Broadcast (DAB) receivers (domestic and vehicle-based); and

• a variety of domestic communications and audio devices.

The objective was to ascertain whether any interference was generated and, if so, what kind and under what

circumstances, such that further studies may be made.

A.3.2.1.2 Test Plan

A.3.2.1.2.1 Environmental Considerations

The tests were carried out at Edgcott in Buckinghamshire in the United Kingdom (UK), which is located at Ordnance

Survey (OS) grid reference SP677225.

A.3.2.1.2.1.1 Local Transmitting Stations

The Band II (FM) and DAB signals were primarily received from Oxford Transmitting Station, located at Beckley, OS

grid reference SP567105, some 19 miles from Edgcott. This location also broadcasts MW (AM) on 1197 KHz.

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Creative i300 - TravelSound MP3 Players Manuel d'utilisateur Page 35