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Tone Channel Guard Decode (FCN 2 6)
When the FCN 2 6 function is selected the radio displays
[CG DEC] and looks for an on channel signal modulated
with 210.7 Hz tone. If the tone is present the squelch is
opened.
RADIO ALIGNMENT PROCEDURE
To align the radio, test mode operation must be used as
described in the Test Preparation section. Refer to Figure 1
for location of adjustment controls. Refer to Figures 3, 4, and
5 for Troubleshooting, Control Signal, and Power Distribu-
tion Diagrams.
TEST EQUIPMENT AND SERVICE AIDS
The following list of test equipment and service aids is
provided to facilitate servicing.
•
Test Interface Box
TQ0618
Figure 1- Location of Adjustment Controls
•
•
•
•
•
PC Programming Adapter - includes
TQ3310
19D438367G1 Programming Inter-
or
face Box w /LBI-31986, ca ble
TQ3370
19B235027P1 (interface to PC Com-
put er),
19B800850P2
Programming cable - interface to
TQ3371
MDR Series radios
19A704875P1
Service cable - provides an extension
between the audio and logic boards to
permit servicing both sides of the
audio board while powered up
Service Cable - provides an extension
19A705235P2
(two feet) between the System and
Audio Amplifier Boards. Not required
for most servicing if exiting cable is
not looped through the front of the
radio assembly
Provides a two foot extension between
19A801348P4
the 9-pin "D" connectors on the Logic
and Audio Amplifier boards. Permits
servicing the Audio Amplifier board
while power is applied
LBI-38953
and
Pow er
Suppl y
15
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