Interfacing a Kenwood TKR-820 Repeater and an S-Com 5K Repeater Controller

Up one level (Kenwood)
Up one level (S-Com)
Back to Home Interfacing a Kenwood
TKR-820 Repeater
and an S-Com 5K
Repeater Controller
Submitted by Jake Eckardt N3FU
Turned into an article by Robert W. Meister WA1MIK

I'm presenting this information to make it easier for anyone else who wants to connect these two units. This same connection information will also work for the TKR-720 VHF repeater.

The 15-pin Molex accessory connector's pins are arranged according to the diagram below. The connector you need to acquire fits around the one in the TKR-820 and uses 0.062 inch male pins. Molex calls this a "plug". See this article for more information.

Here's the TKR-820's accessory connector pin assignment.

Pin Signal Description

1 External Hook Terminal

2 Line Input Ground

3 Direct Modulation Input

4 Direct Detection Output

5 Transmitter Line Input

6 Speaker Output Ground

7 +13.6V External Power Output

8 External PTT Input

9 Internal Speaker Input

10 Receiver Line Output

11 DC Ground

12 Speaker Output

13 Receiver Unsquelched Output

14 Unused

15 Unused

Pin	Signal Description
1	External Hook Terminal
2	Line Input Ground
3	Direct Modulation Input
4	Direct Detection Output
5	Transmitter Line Input
6	Speaker Output Ground
7	+13.6V External Power Output
8	External PTT Input
9	Internal Speaker Input
10	Receiver Line Output
11	DC Ground
12	Speaker Output
13	Receiver Unsquelched Output
14	Unused
15	Unused

The S-Com 5K has a DB-25 female connector on it. You will need a male DB-25 connector to plug into it. Here's the pin numbering from the solder side of the connector.

Here's the S-Com 5K's DB-25 female connector pin assignment.

Pin Signal Description

1 Logic Input #1

2 Logic Input #2

3 Logic Input #3

4 Repeater RX CTCSS Input

5 Control RX COR Input

6 Repeater RX COR Input

7 Logic Output #1

8 Logic Output #2

9 Logic Output #3

10 Repeater TX PTT Output

11 Repeater TX Audio Output

12 Control RX Audio Input

13 Repeater RX Audio Input

14-25 All Ground

Pin	Signal Description
1	Logic Input #1
2	Logic Input #2
3	Logic Input #3
4	Repeater RX CTCSS Input
5	Control RX COR Input
6	Repeater RX COR Input
7	Logic Output #1
8	Logic Output #2
9	Logic Output #3
10	Repeater TX PTT Output
11	Repeater TX Audio Output
12	Control RX Audio Input
13	Repeater RX Audio Input
14-25	All Ground

Here's how to wire the cable that goes between the two units.

Pin S-Com 5K Signal Name TKR-820 Signal Name Pin

4 Repeater RX CTCSS Input Receiver Unsquelched Output 13

6 Repeater RX COR Input Receiver Unsquelched Output 13

10 Repeater TX PTT Output External PTT Input 8

11 Repeater TX Audio Output Transmitter Line (Audio) Input 5

13 Repeater RX Audio Input Receiver Line (Audio) Output 10

14 Ground DC Ground 11

25 Ground Line Input Ground 2

Pin	S-Com 5K Signal Name	TKR-820 Signal Name	Pin
4	Repeater RX CTCSS Input	Receiver Unsquelched Output	13
6	Repeater RX COR Input	Receiver Unsquelched Output	13
10	Repeater TX PTT Output	External PTT Input	8
11	Repeater TX Audio Output	Transmitter Line (Audio) Input	5
13	Repeater RX Audio Input	Receiver Line (Audio) Output	10
14	Ground	DC Ground	11
25	Ground	Line Input Ground	2

Additional TKR-820 (Molex) jumpers:

Pin 1 to pin 11 to disable the internal controller.
Pin 9 to pin 12 to enable the internal speaker (optional).

You can also power the S-Com 5K controller from the TKR-820 repeater by wiring the coaxial power plug to pin 7 (positive) and pin 11 (negative) of the Molex connector.

For those of you who like graphics, click here for a pictorial wiring diagram.

Acknowledgements and Credits:

Connector pin information came from the Kenwood and S-Com manuals.

Contact Information:

The author can be contacted at: jake1 [ at ] centurylink [ dot ] net.

Back to the top of the page
Up one level (Kenwood Index)
Up one level (S-Com Index)
Back to Home

This page originally posted on 18-Jan-2016.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.