User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 59 of 78
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
If a "balanced way" is anyway desired, much more care has to be taken to Vmic noise and ground
noise; also the 33pF-100Ohm-33pF RF-filter has to be doubled (one each wire).
NOTE:
Since the J-FET transistor inside the microphone acts as RF-detector-amplifier,
ask vendor for a microphone with anti-EMI capacitor (usually a 33pF or a 10pF
capacitor placed across the output terminals inside the case).