Section 5. Installation
5-17
Connection to a Kenwood TKR720 / TKR820
For:
Zetron Model 37-MAX
To:
Kenwood TKR720 / TKR820
Using:
709-7179 Generic Radio Cable
37-MAX End
Function
J1
pin#
Wire
Color
Radio End
Connection/Notes
+12 volts DC
1
RED
Pin-7, SB
Ground
2
BLACK
Pin-6 and Pin-11, Ground
Discriminator Input
3
WHITE
Pin-4, DE
Ground
4
BRAID
No connection
TX Audio Output
5
BLUE
Pin-5, L1
Ground (spare)
6
N/C
PTT Output
7
ORANGE
Pin-8, PTT
Ground
8
BROWN
No connection
COR Input
9
YELLOW
Pin-13, CO
CTCSS/DCS Encode
10
GREEN
Pin3, D1
TKR720 / TKR820 Configuration
For all TKR repeaters:
1. Make up two wire jumpers to install on the radio's auxiliary plug. Place one from pin-1
(HK) to pin-2 (LG), this is the PTT Enable jumper. Place the second from pin-9 (SI) to
pin-12 (SO), this is the Speaker Enable jumper.
2. Set the repeater's front panel switches to: TAKEOVER = Off / Disabled, REPEAT = Off
/ Full Duplex Transceiver, Monitor = DC
NOTE:
The following modifications do not apply to all versions of the TKR-repeaters, only the
earlier versions. Refer to the Kenwood service manual and schematic diagrams.
1. On the TX/RX Unit board, foil side: Cut the trace leading to CN3-8 (AFO). Add a jumper wire
between CN3-8 and CN6-9 (DET). This corrects a foil error found in older Kenwood units. Cut
the trace between CN7-1 (tone) and R68. This isolates the tone board injection point when the
Zetron device keys the transmitter.
2. On the Display Unit board, foil side: Remove R14, and add a jumper wire between CN8-4 (DE)
and CN2-6 (DET). This bypasses C22 on the Display Unit board for DCS decode capability.
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...
