E F Johnson Company 2422001-1 Benutzerhandbuch
ALIGNMENT AND TEST PROCEDURES
7-15
August 2000
Part No. 001-2001-200
5. On the modulation analyzer select:
300 Hz
3 kHz
750
3 kHz
750
µ
s de-emphasis
6. Distortion is < 2%.
LTR Modem Repeat Audio Level Adjust
NOTE: Valid only with LTR modem option.
1. Adjust the RF generator for 100
µ
V into the
receiver with a 1 kHz tone at
±
1.5 kHz deviation
(25 kHz channels) ±800 Hz (12.5 kHz channels).
Be sure the Modulation Analyzer LPF switch is set
to 3 kHz.
Be sure the Modulation Analyzer LPF switch is set
to 3 kHz.
2. Press the space bar to key the transmitter.
3. Adjust R305 for
±
1.5 kHz
±
100 Hz deviation
(25 kHz channels) or 800 Hz (12.5 kHz channels)
out of the Transmitter.
out of the Transmitter.
4. Press the space bar to unkey the transmitter.
7.4.6 VOTER AUDIO LEVEL ADJUSTMENT
NOTE: Use an unbalanced audio voltmeter.
1. Inject a 1 kHz tone at -12 dBm (194 mV RMS) into
J2, pin 17. This tone represents
±
1.5 kHz deviation
in the Voter Receiver.
2. On the MAC, adjust R233 to obtain a level of
-6 dBm (387 mV RMS) at J100/J103.
7.4.7 AUDIO/DATA LEVEL ADJUSTMENTS
NOTE: Section 7.4.5 must be completed before any of
the following adjustments can be made.
the following adjustments can be made.
NOTE: All audio generators and audio voltmeters are
unbalanced unless specifically stated otherwise.
unbalanced unless specifically stated otherwise.
Voice Audio From Repeater
1. On the MAC, set 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.
RXA- on J2, located on the back of the Repeater.
4. On the MAC, adjust R239 for the type of line used.
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
-28 dBm (31 mV RMS)
Voice Audio To Repeater
1. On the MAC, set S100 and S101, all Sections OFF
(see Figure 7-9).
Figure 7-9 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 7-11).
used, into TXA+ and TXA- of J2 located on the
back of the Repeater (see Figure 7-11).
Leased Line/Direct Connect (default)
-12 dBm (194 mV RMS)
-12 dBm (194 mV RMS)
Microwave/T1 (optional)
-28 dBm (31 mV RMS)
-28 dBm (31 mV RMS)
3. On the MAC, adjust R243 to obtain -6 dBm
(387 mV RMS) measured at J100/J103.
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
)
S10
0
S10
1
FS
K
TX
S+