Kenwood TK7180 / TK-8180 Microphone Connector Notes by WA6ILQ

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Back to Home Kenwood TK-7180 / TK-8180 (and similar) Mobile Radio Microphone Connector Notes
Compiled, HTML'd and Maintained by Mike Morris WA6ILQ

Comments, critiques, corrections and updates for this page (or any page at this web site) are be appreciated.

The Kenwood TK-7180 / TK-8180 microphone connector is a RJ-45 female mounted into the lower left front of the radio. Pins are 1-8 starting at the bottom of the radio. This numbering is backwards from the Kenwood 6-pin microphone jacks.
Drawings: 8 pins 6 pins

The "Signal Name" in the second column is the Kenwood assigned name on the schematic in the manual and in the manual text. The Input/Output refers to the radio... example: the microphone audio output is an input to the radio.

This table was derived from research done on a customer Kenwood TK-8180 that I had on my bench one day (the mic jack is J701 on that schematic on pages 47, 54, 72, 73 and 74). Many other Kenwood commercial radios use a similar pinout.

This article is also relevant.

Pin
# Signal
Name Input
Output Description

1 BLC Output Microphone Back Light Control (KMC-36 and similar).

2 PSB Output DC radio power, switched by radio power switch, can supply about 200 ma maximum.

3 Ground -

4 PTT / TXD Input / Output PTT In, asserted=0 volts, idle=+5 volts from a pullup resistor.
TXD: serial data out, CMOS levels (used for radio programming).

5 ME - Microphone Earth (ground).

6 MIC Input Microphone audio, a 1 KHz tone at about 3.75 mv signal results in about 50% deviation.

7 HOOK / RXD Input HOOK: hookswitch detection
RXD: Serial data input, CMOS Levels (used for radio programming)

8 DM Input / Output MIC DATA line Used by the KMC-36 (and similar) mobile DTMF microphone for the NX700/900, TK7180/8180, TK880.

Pin #	Signal Name	Input Output	Description
1	BLC	Output	Microphone Back Light Control (KMC-36 and similar).
2	PSB	Output	DC radio power, switched by radio power switch, can supply about 200 ma maximum.
3	Ground	-
4	PTT / TXD	Input / Output	PTT In, asserted=0 volts, idle=+5 volts from a pullup resistor. TXD: serial data out, CMOS levels (used for radio programming).
5	ME	-	Microphone Earth (ground).
6	MIC	Input	Microphone audio, a 1 KHz tone at about 3.75 mv signal results in about 50% deviation.
7	HOOK / RXD	Input	HOOK: hookswitch detection RXD: Serial data input, CMOS Levels (used for radio programming)
8	DM	Input / Output	MIC DATA line Used by the KMC-36 (and similar) mobile DTMF microphone for the NX700/900, TK7180/8180, TK880.

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The author, Mike Morris WA6ILQ, can be contacted here.

This page created on 30-Jan-2022 by Mike WA6ILQ.

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.