AR6201 - RT6201 - RCU6201 - AR6203
DV 14307.03 Issue 1 09/2013 Page 2-11
2.4.2 Inputs / Outputs Detailed Description
Microphone Connection – Standard Microphones
Pin No. Pin Name Direction Function
P1-8 MIKE_STD_LO - Standard microphone(s) low
(ground/return) used for STD1, STD2
and STD3
P1-9 MIKE_STD2_HI IN Standard microphone 2 high (hot)
P1-18 MIKE_STD1_HI IN Standard microphone 1 high (hot)
P1-19 MIKE_STD3_HI IN Standard microphone 3 high (hot)
The transceiver has three unbalanced inputs STD1, STD2 and STD3. Each input has
an input impedance of 110 Ohm and a nominal sensitivity of 110 mV.
This sensitivity level can be adjusted in the installation setup from 9 mV to
1500 mV independently for each of the microphones. The power supply delivered
from pins P1-9, P1-18 and P1-19 for supply of the connected microphone(s) is >
8 V DC (8.3 V nominal) open circuit with an output impedance of 120 Ohm.
Note:
1. Sensitivity range 25 mV to 1000 mV was qualified under environmental
conditions.
2. For common aviation microphones the power supply is able to support
two microphones in parallel. It is recommended to combine only
microphones of the same type / impedance.
3. For installations with high interferences it is recommended to use
sensitivity level 27 mV to 1500 mV.
4. It is highly recommended to mount the jacks isolated from aircraft
frame in order to avoid ground loops.
Microphone Connection - Dynamic Microphone
Pin No. Pin Name Direction Function
P1-5 MIKE_DYN_HI IN Balanced input for dynamic
microphone(s)
P1-6 MIKE_DYN_LO IN Balanced input for dynamic
microphone(s)
For interfacing with dynamic microphone(s) the transceiver has a balanced
input with an impedance of 140 Ohm and a nominal sensitivity of 1.6 mV. This
sensitivity level can is adjustable in the installation setup from 1 mV to 20
mV. Two dynamic microphones in parallel may be connected (identical technical
characteristics of the microphones are preferable).
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