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MDS 05-2818A01, Rev. C
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Transmit Audio Level, R19
While monitoring the transmitted signal on a communications ser vice monitor,
adjust the Transmit Audio Level control, R19, to achieve the desired deviation
level of 2.5 kHz for 12.5 kHz channel operation, or 3.0 kHz for 25 kHz channel
operation. The
switch, SW1, on the Interface/Utility Board can be
TX TEST
used to manually key the transmitter during this adjustment. The audio present
on Pins 1 and 2 of J1 is used to modulate the transmitter. The level must be
within the range of –20 dBm to +10 dBm.
Receive Audio Level, R2
The Receive Audio Level control, R2, is used to set the outgoing signal level
to Pins 4 and 5 of J1. With an actual or simulated signal being received by the
transceiver, adjust R2 to achieve the desired line level signal to the associated
remote equipment. The outgoing level depends on the desired signal level at
the remote terminal unit. The maximum output level is + 6 dBm at 600 . Con-
sult the RTU manual for specific recommendations.
5.10 Order Wire Levels (Analog Interface/Utility
Board P/N 03-1105A21)
On an MDS P-50 Analog Interface/Utility Board, the Order Wire level is fac-
tory set with fixed resi s tors. There are no Order Wire level adjustments on this
board.
Order Wire Levels (Digital Interface/Utility Board
03-1467A21)
The Interface/Utility Board has an Order Wire Deviation control, R19, used to
set the transmit modulation level of the audio from the local Order Wire
handset's microphone. The Order Wire handset is plugged into J9 on the Inter-
face/Utility Board.
While monitoring the transmitted signal on a communications ser vice monitor,
adjust the Order Wire Level control, R19, to achieve the desired deviation
level—2.5 kHz for 12.5 kHz channel operation, and 3.0 kHz for 25 kHz
channel operation. The radio is automatically keyed by speaking into the Order
Wire handset (VOX).
Unintentional sound picked up by the Order Wire handset may key
NOTE:
the transmitter and interrupt the normal data flow through the trans-
ceiver. To prevent erratic operation of the system, remove the Order
Wire handset when the Order Wire is not in use.
Battery Charging Check—AC-Powered Units Only
For proper charging of the battery, the power supply must be set at the correct
output voltage. To check for the correct charger output, perform the following
procedure:
1. Disconnect the battery by removing the plug from J4 on the
Interface/Utility Board.
2. Connect a 1.5 k (1/4 watt or larger) resistor between Pins 2 & 3 of J4. This
simulates the load of a discharged battery.
MDS P-60/P-60 HL Reference Manual
65
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