User's Manual

page 46/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
Document Sagemcom Reproduction et divulgation interdites
Sagemcom document. Reproduction and disclosure prohibited
7.4 MECHANICAL SURROUNDING
 Do not apply mechanical pressure over the HiLoNC V2 shield, this could damage the mechanical
structure of the shield and lead to internal short-circuits or other undesirable issues.
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Avoid any metallic part around the antenna area
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Keep FPCs and battery contact (if any) far from antenna area.
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FPC's (if any) have to be shielded
7.5 OTHER RECOMMENDATIONS – TESTS FOR PRODUCTION/DESIGN
SAGEMCOM guarantees the RF performances in conductive mode but strongly recommends making RF
measurements in an anechoic chamber in radiated mode (tests conditions for FTA): the radiated performances
strongly depend on radio integration (layout, antenna, matching circuit, ground area…..)
8. AUDIO INTEGRATION
Audio mandatory tests for FTA are in handset mode only so a particular care must be brought to the design of
audio (mechanical integration, gasket, electronic) in this mode.
The audio norms which describe the audio tests are 3GPP TS 26.131 & 3GPP TS 26.132.
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Note that acoustic competences are mandatory to get accurate audio performance on customer’s product.
8.1 MECHANICAL INTEGRATION AND ACOUSTICS
Particular care to Handset Mode:
To get a better audio output design (speaker part):
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The speaker must be completely sealed on front side.
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The front aperture must be compliant with speaker supplier’s specifications
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The back volume must be completely sealed.
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The sealed back volume must be compliant with speaker supplier’s specifications
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Take care of the design of the speaker gasket (elastomer).
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Foresee a stable and large enough area for the gasket of the artificial ear.
To get a better audio input design (microphone part):
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Take care of the design of the microphone (elastomer).
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All receivers must be completely sealed on front side.
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Microphone sensitivity depends on the shape of the device e.g. about –40 ±3 dBV/Pa.
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Promote the use of pre-amplified microphone. If needed, use a pre-amplification stage.