R&S 4200 Series Operating Manual page 207

Interface Description
Entry in column D (direction): O = Output
Entry in column T (type):
Signal description
AUDIO_RX_B
/TEST_OC
GND
V_OP_SW
*OFF
SQ+
SQ−
AF_TX_INBAND_B
RX Audio Extended X11\RX Audio Extended X11 "Radio".doc
I = Input
A = Analog D = Digital
D T Range
O A 0 dBm ± 1.5 dB
into 600 Ω
–30 to +10 dBm
settable via software
300 to 3400 Hz
600 Ω ±15 % balanced
RX-ALC switchable
for modulation depth
30 to 90 %
O D Low = no error
Open collector =
request for
main/standby
switchover
Open collector
Ri = 10 Ω
limited to max. 6.8 V
B P
O P 0 V/19 to 32 V
Inactive: 0 V
Active: 19 to 32 V
Switched supply
Reverse current safe
I D Low (external contact
against ground)
= device off
High (or open) = on
Internal pull-up 10 kΩ
to 3.3 V, limited to
max. 6.8 V
O D Relays contact
between SQ+ and
O D
SQ−
Closed = RX signal
level above
SQ threshold
Open = no RX signal
max. 0.2 A
I A (Reserved)
B = Bi-directional
P = Power
Contact
X10.3
X10.4
X10.5
X10.6
X10.7
X10.8
X10.9
X10.10
6.11
R&S XU 4200
Remarks
Audio transformer min.
500 V isolation to ground
TEST_OC signal
generated by NOGO logic
on backplane
Operational voltage
switched
Max. 1 A for external
antenna relays
Note: Maximum current in
sum with X5.6, X7.1/X7.2,
and X11.1/X11.2
Corresponds to VOP LED
on front panel
Hardware input for
activating/deactivating
transceiver module
Differential voltage over
68 V between SQ+ and
SQ− will be clipped
Corresponds to SQ LED
on front panel
(Reserved)
6166.5368.02.01