Installation
025-9368H
19
Kenwood TKR-720 / TKR-820 Repeater
For:
Zetron Model 38, 38-MAX, 39-MAX, 45B, 48B, 48-MAX, 735, 745, 748
To:
Kenwood TKR-720 / TKR-820 repeater
Using: 709-7112 Generic radio cable
ZETRON END
RADIO END
Function Pin
Color
Connection
/
notes
12 volts AC/DC in
1
Red
Pin 7 SB
12 volts AC input
2
---
DC ground
3
Black
Pin 11 Ground
Ground
4
Shield
No Connect
PTT NC
5
---
PTT COM
6
Jmpr
PTT NO
7
Orange
Pin 8 PTT
Aux relay
8
---
Sense/alarm
9
---
COR input
10
Yellow
Pin 13 CO
TX audio
11
Blue
Pin 5 L1
Ground
12
---
CTCSS/DCS encode
13
Green
Pin 3 D1
Ground
14
Brown
Pin 6 SG
Discriminator in
15
White
Pin 4 DE
PTT enable Pin 1 HK
jumper
Pin 2 LG
Speaker enable Pin 9 SI
jumper
Pin 12 SO
Radio Modifications:
Note: These modifications may not apply to all versions of the TKR-radio. Refer to the Kenwood
service manual and schematic diagram.
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 repeater.
2.
On the Display Unit board, foil side: Remove J14, and add a jumper wire between CN8-4 (DE)
and CN2-6 (DET). This bypasses C22 on the display board for DCS decode capability.
3.
Set the switches for:
Takeover = Off / disabled
Repeat = Off / full duplex transceiver
Monitor = DC
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