Instruction manual

ACU-1000 Operations Manual
7-3
Table 7-2 HSP-2A Module Connections- P13
PIN Signal Description
1
Ground
Ground connection.
2
N/C
No connection.
3
/AUX Out 1
Auxiliary Output 1- Active low; used for special functions only.
4
/AUX In 1
Auxiliary Input 1- Active low; used for special functions only.
5
Ground
Ground connection.
6
External Speaker –or –
Ground for single ended
audio
External Speaker output- Use JP1 to enable.
Configure via JP10. Ground used to allow use of standard Raytheon
radio and NXU-2A interface cables.
7
Audio Ground
Ground connection for Mic audio input.
8
Audio Line In
0 dBm line level audio input; 22k-100K ohm impedance via gain
select jumpers JP7-JP9.
9
N/C
Alternant COR in HSP-2A.
10
/AUX Out 2
Auxiliary Output 2- Active low; used for special functions only.
11
/AUX In 2
Auxiliary Input 2- Active low; used for special functions only.
12
/PTT Out (/AUX Out 3)
Active Low PTT output to a transmitter.
13
COR IN (/AUX In 3)
COR Input from a receiver; active low. May also be configured as
Auxiliary Input 3- Active low; used for special functions only.
14
Monitor Out
Same audio as fed to the speaker except at 0 dBm line level from a
600 ohm source. Level is not affected by the front panel volume
control.
15
N/C
No connection; not used in the HSP-2A.
7.4 HSP-2/HSP-2A Compatibility Details
7.4.1 Handset Microphone
The HSP-2A handset mic level is now adjustable in three steps using jumpers as detailed
below.
JP4 -6dB
JP5 0dB
JP6 +6dB
The mic circuit no longer has an ALC circuit.
7.4.2 Line Input
The line inputs (pin 8 of the DB-15) are also adjustable with jumpers which was not possible
before, see below.
JP7 -6dB
JP8 0dB
JP9 +6dB