Section 5. Installation
5-2
INSTALLATION PROCEDURE
The following procedure is generic in nature. If used by itself, the technician must supply
equipment specific information concerning the proper points at which to make connections
for the radio(s) and power supply used. Radio specific application notes are available at the
end of this section of the manual, which supply connection information for some of the more
popular repeater stations.
Note
PLEASE REVIEW THE
ENTIRE
INSTALLATION PROCEDURE BEFORE STARTING
TO MAKE CONNECTIONS.
1. Power Supply
:
Locate and verify the voltage of the power supply for the radio receiver
and transmitter. With a voltmeter, set to a DC scale, confirm that the voltage is between
10.5 and 15.0 volts. Connect the positive supply lead to J1/pin-1 (
+12VDC
) of the Model
37-MAX, and the power supply ground lead to J1/pin-2 (
GND
). DO NOT crimp the
connector onto the ground lead until step #2.
2. Ground Connection
:
Connect a wire from J1/pin-2 (
GND
) of the Model 37-MAX to the
chassis ground of the transmitter/receiver.
3. Transmitter PTT
:
Connect a wire from J1/pin-7 (
PTT
) of the Model 37-MAX to the PTT
input of the transmitter. This output is an 'open-drain' FET that pulls to ground when PTT
is activated.
4. Transmitter Audio Output
:
Connect a shielded cable from J1/pin-5 (
TX AUD
) of the
Model 37-MAX to the microphone input of the transmitter. Connect the shield braid to
J1/pin-6 (
GND
) of the Model 37-MAX, and leave it unconnected on the radio end.
5. Discriminator Input
:
Connect J1/pin-3 (
DISC
) of the Model 37-MAX to the discriminator
output of the receiver. Shielded cable must be used for this connection. Connect the
shield braid to J1/pin-4 (
GND
) of the Model 37-MAX, and leave it unconnected on the
receiver end.
NOTE:
Unfiltered, unsquelched discriminator audio must be used for proper operation of the CTCSS
/ DCS decoder circuits in the Model 37-MAX.
6. CTCSS Encode
:
Connect J1/pin-10 (
TONE OUT
) of the Model 37-MAX to the direct
modulation input of the transmitter. Shielded cable must be used for this connection.
Connect the shield braid to J1/pin-8 (
GND
) of the Model 37-MAX.
Summary of Contents for 37-MAX
Page 72: ...Section 6 Repair 6 6 MODEL 37 MAX REPEATER PAL 702 9808A Schematic 1 3...
Page 73: ...Section 6 Repair 6 7 2 3...
Page 74: ...Section 6 Repair 6 8 3 3...
Page 75: ...Section 6 Repair 6 9 MODEL 37 MAX REPEATER PAL 702 9808A Silkscreen...
Page 76: ...APPENDIX A PROGRAMMING LOG A 1 OVERVIEW A 1 SYSTEM PROGRAMMING A 2 USER PROGRAMMING A 3...
