Viking VX 900 MHz LTR, User Manual

Page: 130 / 234

ALIGNMENT AND TEST PROCEDURES
7-18
October 1999
Part No. 001-2009-201
3. Press the space bar to key the transmitter.
4. Deviation shall be between 1.35 and 1.5 kHz.
5. Adjust 1 kHz signal to -8.2 dBm (300 mV RMS).
Deviation shall be between 750 and
850 kHz.
6. Adjust 1 kHz signal to -17.8 dBm (100 mV RMS).
Deviation shall be between 450 and
500 kHz.
7. Press the space bar to unkey the transmitter.
7.6.8 AUDIO/DATA LEVEL ADJUSTMENTS
NOTE: Section 7.6.6 must be completed before any of
the following adjustments can be made.
NOTE: All audio generators and audio voltmeters are
unbalanced unless specifically stated otherwise.
Voice Audio From Repeater
1. Set MAC S100 and S101, all Sections OFF.
2. Adjust the RF generator for 100
µ
V modulated with
a 1 kHz tone at
±
1.5 kHz deviation.
3. Connect a balanced AC voltmeter with a 600 ohm
input impedance between balanced lines RXA+ and
RXA- on J2, located on the back of the Repeater.
4. Adjust R239 on the MAC for the type of line.
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
Voice Audio To Repeater
1. Set MAC S100 and S101, all Sections OFF (see
Figure 7-12).
Figure 7-12 S100 SETTING
2. Inject a 1 kHz tone from a balanced 600 ohm
source, at the level determined by the type of line
used, into TXA+ and TXA- of J2 located on the
back of the Repeater (see Figure 7-13).
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
3. Adjust R243 on the MAC to obtain -6 dBm (387
mV RMS) measured at J100/J103.
Figure 7-13 J2 TERMINAL BLOCK
ON
2
1
8
7
6
5
4
3
ON
2
1
4
3
RX
S-
(G
ND
)
RX
S-
RX
S+
(A
UD
IO
)
RX
S+
(F
SK
)
RX
S-
(G
ND
)
TX
S-
TX
S+
(A
UD
IO
)
TX
S+
(F
SK
)
S1
00
S1
01
FS
K
TX
S+
2
1
33
34
RXA+
RXA-
J2
TXA+
TXA-