Installation Manual

THALES COMMUNICATIONS
OIM
AHV1600-SYSTEM
Page 117
July 16/09
 Initiated Built In Test (IBIT) function inhibited when it is set to low level voltage (dis-
crete grounded).

Initiated Built In Test (IBIT) function enabled when it is set to high level voltage (dis-
crete open).
In the AHV1600 transceiver, the discrete input signal “TST_INH” shall be in accordance with
the following electrical characteristics:

Low level voltage

+ 3.5 VDC with sink current < 2mA (discrete grounded).

High level voltage

+15.3 VDC with sink current < 1 mA.

Maximum level voltage

+32.2 VDC.
when measured to the “M_GND” reference signal.
To inhibit the internal Built In Test function of the AHV1600 transceiver, the minimum time du-
ration of “TST_INH” discrete input signal shall be 200ms when measured at 50% level of the
electrical changing voltage.
In the AHV1600 transceiver, the discrete input signal ”TST_INH” shall be protected against
the indirect effect of lightning.
3. OPERATIONAL INTERFACES
A. POWER SUPPLY
The Transceiver shall be powered with a 28 Vdc ± 5 %.
The voltage transients shall be:

range 21 V to 32 V for up to 2 ms,

range 21 V to 38 V for up to 1 ms.
The Transceiver shall be not damaged in unusual conditions:
 50 V during 50 ms.
B. DIGITAL ARINC429 INTERFACE
This digital interface outputs the altitude information exchanged between the Transceiver and the
navigation computer. There is no ARINC 429 input.
All information is through the Main receptacle J1.
ARINC 429 outputs are differential output signals:

first ARINC429 output (IRS1 TX HI / IRS1 TX LO),
 second ARINC 429 output (IRS2 TX HI / IRS2 TX LO).*
(1) ELECTRICAL CHARACTERISTICS
(a) When measured to the AID ground reference signal in open circuit
- differential low level voltage : - 10 Vdc

1 Vdc
- differential high level voltage : + 10 Vdc

1 Vdc