Wire Line Remote Base Phone Line Levels; Transmit Line Input; Receive Line Input - Motorola R-2001D Operator's Manual

WIRE LINE REMOTE BASE
PHONE LINE LEVELS
A. Phone Line Levels
1. Perform the Transmitter Modulation procedure, outlined in the previous method, before proceeding with the
phone line level adjustments.
2. Connect the Analyzer to the base station under test as shown in figure
4-17.
Connect
RF
In/Out to the antenna
connector and Mod Out - DVM/Counter In connector to the station phone line input.
CAUTION
Disconnect the telephone line from the base station and connect a 600 ohm load across the input. Failure to do so
will introduce hum and noise that will cause erroneous readings.
3. To measure levels across a balanced phone line, refer to paragraph D. To generate signals across a balanced phone
line, refer to paragraph E.
B. TRANSMIT Line Input
1. Set DISPLAY to DVM, FUNCTION switch to Monitor FM, and MODULATION switch to off. Set MONITOR
BW switch to narrow and squelch control to threshold.
2. Set attenuator to -30 dB. For low-power transmitters, it may be necessary to reduce the attenuator setting to un-
squelch the monitor. Too high an attenuator setting or too tight a squelch setting inhibits the modulation devia-
tion display.
3. Enter the proper transmitter frequency. Move the display cursor down to DVM and enter 1 for AC mode.
4. Adjust the 1 KHz Level control for the DBM level expected from the remote control console. The typical value of
-16 dBm will be +/-4 dB of most actual levels.
5. Remove the cable from the DVM/Counter In connector coming from Mod Out. Connect the cable coming from
the line driver output to DVM/Counter In.
6. Adjust the exciter level control on the station control module for the value stamped on the exciter, as indicated on
the display.
7. Set DISPLAY to Oen/Mon Mtr. Make a line push-to-talk by applying the proper control signal to the input line.
Verify that modulation is 5 KHz.
C. RECEIVE Line Output
1. Disconnect the cable from the Mod Out and DVM/Counter In connectors. Connect the cable from the receiver
line driver output to the DVM/Counter In.
2. Set DISPLAY to Oen/Mon Mtr, FUNCTION switch to Generate FM, and MODULATION switch to off.
3. Adjust the 1 KHz Level control for 5 KHz DEV indicated on the display. Set the attenuator to -30 dB and the
Variable control to mid-range.
4. Set DISPLAY
to
DVM. Enter the proper receiver frequency. Move the display cursor down to DVM and enter 1
for AC mode.
5. Adjust the line level control on the line driver module for the desired level on the phone line. A typical value for
carrier - type lines is 0 dBm.
4-30
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