Rohde & Schwarz GB4000V, User Manual

Page: 61 / 70

R&S GB4000V Audio Unit
User Manual 6174.7514.02 - 02 59
Auxiliary Interface X3 AUX
Figure 25: Audio interface X3, DSUB female (25pins).
Column D (Direction): O = Output I = Input B = Bidirectional
Column T (Type): A = Analog D = Digital P = Power
Column TI (Test Instructions): P = Test Value T = Trimming Value D = Type Test Value
E = Setting Value
Signal Description D T Range TI Contact Remarks
PTT_RADIO O P
U
min
:
–0.3 V
U
max
: +30 V
open drain
I
max
: 25 mA
R
I
: ~220
Ω
P X3.1 Push-To-Talk
output,
Contact against
GND = transmit
PTT_EXT O D
U
min
:
–0.3 V
U
max
: +30 V
open drain
I
max
: 25 mA
R
I
: ~220
Ω
P X3.2 Push-To-Talk
output,
Contact against
GND = transmit
SQL_RADIO_RECORDER O D
U
min
:
–0.3 V
U
max
: +4.0 V
internal pull-up
(10
kΩ) to +3.3 V
open drain
I
max
: 18 mA
R
I
: ~220
Ω
P X3.3 Radio Squelch
forwarded to the
recorder,
active low
GND B A Ground P X3.4
D_MIC_INPUT_EXT_MIC I A 1 mV ±20 dB
Input impedance
200
Ω
(300 Hz to 3.4 kHz)
Automatic level
controlled (ALC)
P X3.5 Dynamic
microphone
GND B A Ground P X3.6
V_MIC_INPUT_EXT_MIC I A 100 mV ±20 dB
Input impedance
330

Ω
(300 Hz to 3.4 kHz)
8 V DC ± 10 %
Automatic level
controlled (ALC)
P X3.7 Electret
microphone
/PTT_IN_EXT_MIC I D
U
min
:
–0.3 V
U
max
: +4.0 V
internal pull-up
(10
kΩ) to +3.3 V
Low = PTT ON
P X3.8 Push-To-Talk
input,
Contact against
GND = transmit
GND B A Ground P X3.9
RECORDER_OUT_A O A
0 dBm ±1.5 dB
600
Ω
300 Hz to 3.4 kHz
P X3.10 Output to external
voice recorder
RECORDER_OUT_B O A P X3.11