Test Setup (Connectors)
Levels of less than –110 dBm may appear when testing (eg receiver measure-
ments), so the entire setup must be proof against EMI pickup and not radiate any
either. The following measures are recommended for this purpose:
•
Use a double-shielded RF cable between the STABILOCK test set and the
mobile.
•
Terminate the RF DIRECT socket of the STABILOCK with 50 Ω while not in
use.
•
Make sure that all plug-ins of the test set (back panel) are screwed in tightly.
•
Close vacant plug-in slots on the test set (back panel) with dummy panels.
"
Use the supplied BNC/BNC cable (382 678) to connect socket
Bu 103 of the IF unit (back panel) to socket Bu 103 of the D-AMPS
unit (see appendix: "Connectors on the rear"). Without this con-
nection no call can be set up to the mobile.
For other TETRA-specific connectors (eg synchronization port)
see section "Connectors on the rear" in the appendix of this
TETRA manual. For generally available connectors and functions
(eg AF signal generator and analyzer), see chapter 4 of the
STABILOCK manual.
TX
DUPLEX
RX
dB REL
VOLT DIST
BEAT DF
SINAD CCITT
VOLTM
DEMOD
MOD GEN
RX MOD
GEN A B/SAT
EXT
S1
S2
S3
S4
S5
S6
INTENS
SCOPE
ANALYZER MEMORY
AUX
PRINT
HELP
CLEAR
ON/OFF
POWER
MEMORY
CARD
REMOTE
RF
DIRECT
20 dB
RF
50
MAX
MAX
MAX
MOD GEN
RL > 200 8 Vpp
0...20 kHz
1M
0...20 kHz
SCOPE INPUT
POS
AC DC
600
600
600
600 0...20 kHz
DEMOD
VOLTM
30 Hz
30 kHz
MAX
20 V
0,5 W
EMF
<2 V
EMF
<2 V
0
1
2
3
4
5
6
7
8
9
ENTER
-
+
.
STEP
OFF
UNIT/SCROLL
FM AM OM
MODFREQ
LEVEL
FREQU
4032 STABILOCK
UNIVERSAL ANALOG/DIGITAL COMMUNICATION TEST SET
Fig. 10.2: Test setup with TETRA mobile station (handset and transceiver). The test
adapter is not necessary for the described tests. The test adapter couples out the
microphone signal and the loudspeaker signal so that the usual analog tests can also be
performed on TETRA mobiles (e.g. SINAD).
10
General Preparations TETRA MS Test
10-9
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