User's Manual

CE910-DUAL Hardware User Guide
1vv0301010 Rev .0 – 2012-07-10
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 42 of 63
9.1. MIC connection
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).
TIP: 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).