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Microphone connections

On this page you will find a growing list of microphone jacks of different brands and types of transceivers, which I have come across.

Unfortunately, there is no standard microphone connector to connect a microphone to a transceiver. A manufacturer is free to choose the type of plug and the connection scheme. As a result, microphones of different brands and types of transceivers are usually not interchangeable.

Microphone plugs

GX16 microphone connector

One of the well-known microphone connectors is the round GX16 screw connector. For microphones, the version with 4 to 8 pins, which sit in the chassis section, is often used. The GX16 plug has a ring that allows it to be screwed onto the chassis part.

For convenience, the connections of the chassis part and the plug are numbered. Unfortunately, each manufacturer uses a different wiring diagram, so microphones with the same GX16 connector are not interchangeable between brands and sometimes between different transceivers of the same brand.

In the Netherlands, GX16 connectors are for sale from a.o.

    • Consetkeyway with screw
    • Consetwist without screw

RJ45

On some modern sets, the RJ45 connector is used. This connector is used on computers as a network connection.

The RJ45 connector is space-saving and easy to disconnect. The RJ45 connector cannot be soldered, a special crimping tool is needed for mounting. When crimping, the sheath of the cable is clamped in a strain relief.

Separate earth connections

In the microphone and microphone cable, the earth connection of the PTT switch and the microphone is often kept separate. These earth connections are only combined in the transceiver. This prevents fluctuations in the current through the PTT switch, via the resistance of the microphone maasa wire, from affecting the microphone signal. When modifying a microphone jack yourself, keep this in mind as much as possible.

  • Use the separated ground pins of the transceiver connector whenever possible.
  • Where this is not possible, combine the PTT switch ground in the microphone connector and not in the microphone itself.

Legend

Abbreviation Meaning
GND Ground
Mic Microphone signal
NC Not Connected
PTT Push To Talk

Alinco

Alinco DR 510E

2/70 FM

  • Connector GX16-8
  • EMS-53B Electret microphone, separate power supply, without preamp, high impedance
Pin Set Mic
1 Mic signal Mic signal
2 PTT PTT
3 Down Down
4 Up Up
5 DC 5 Volt Electret power supply
6 NC NC
7 Mic GND Mic GND
8 PTT GND PTT GND

Hirose

Icom

Icom 202

2 metres SSB

  • Connector GX16-4
  • Passive dynamic microphone, low impedance
Pin Set Mic
1 Mic signal Mic signal
2 PTT PTT
3 NC NC
4 GND GND

Icom 260E

2 metres FM/SSB

Pin Set Mic
1 Mic signal Preamp out
2 NC NC
3 Up/Down Up/Down
4 NC NC
5 PTT PTT
6 PTT Up/Down GND PTT Up/Down GND
7 Mic GND Mic GND
8 NC NC

Kenwood

Kenwood TM-411A/E

70 cm FM

  • Connector: GX16-8
  • E version: Passive dynamic microphone low impedance
  • A version: Electret microphone with DTMF keypad, separate power supply
Pin Set
1 Mic signal
2 PTT (Standby)
3 Down
4 UP
5 8 volts max 10 mA
6 GND
7 Mic GND
8 GND

Kenwood TR-2300, TR-7200

2-metre FM

  • Connector GX16-4
  • Passive dynamic microphone, low impedance
Pin Set Mic
1 Mic signal Mic signal
2 PTT PTT
3 GND PTT GND
4 GND Mic GND

Kenwood TR-9000

2 metres FM/SSB

Pin Set Mic
1 Mic signal Mic signal
2 PTT PTT
3 Down Down
4 Up Up
5 FM common 8 volts NC
6 GND GND

Kenwood TS-140S

HF all mode

Pin Set
1 Mic signal
2 PTT (Standby)
3 Down
4 Up
5 DC 8 volts max 10 mA
6 Audio out (via 470 Ohm)
7 Mic GND
8 PTT (Standby) GND

Kenwood MC-50 microphone

Capsule impedantie 170Ω

Kyokuto

Kyokuto FM-10SA

2-metre FM

  • Connector GX16-4
  • Passive dynamic microphone, low impedance
Pin Set Mic
1 PTT GND PTT GND
2 PTT PTT
3 Mic GND Mic GND
4 Mic signal Mic signal

QYT

QYT 9800D

2/70 FM

Yaesu

Yaesu FT-270R

  • Connector GX16-8
  • Electret microphone with separate power supply, high impedance, without preamp
Pin Set Mic
1 Up Up
2 DC 5 volts Electret power supply
3 Down Down
4 NC NC
5 Speak Speak
6 PTT PTT
7 GND GND (Mic, PTT)
8 Mic signal Mic signal

Yaesu FT-707, FT 757

HF all mode

Pin Set Mic
1 Up Up
2 Common Up/Down/Fast Up/Down Common
3 Down Down
4 Fast Fast
5 Common Up/Down/Fast Fast Common
6 PTT PTT
7 GND GND (Mic, PTT)
8 Mic signal Mic signal

Microphone characteristics

Passive microphone

Passive transceiver microphones have no built-in pre-amplifier give a low signal level and almost always use a dynamic microphone element with an impedance between about 200 and 600 ohms. The signal level of a passive microphone is low; the microphone input of the transceiver has high sensitivity.

The signal of different passive handheld microphone elements is in the same order of magnitude, so passive microphones of different brands and types, are often interchangeable.

Active hand microphone

Active hand microphones have a built-in pre-amplifier, this pre-amplifier is fed from the transceiver and has a high output signal. A manufacturer can choose a dynamic electret microphone element and adapt the design of the preamplifier accordingly.

For feeding the preamplifier, a manufacturer can choose between feeding via the microphone signal wire, or feeding via a separate wire. For simple active microphones without extensive features, a power supply via the signal wire is often chosen. For microphones with many extra features like a keyboard, the power supply is often via a separate wire.

Active microphones are often not interchangeable due to the design of the pass-through amplifier, the method of feeding and the height of the supply voltage. However, it is possible to recreate the preamp yourself and build it into a passive microphone with a suitable element.

Active table microphone

Active table microphones are often designed to be connected to a transceiver suitable for a passive unamplified microphone. The signal level of an active table microphone is adjustable so you can sit further away from the microphone and give the same signal as a passive handheld microphone held close to your mouth. The preamplifier is often powered from a built-in battery or a separate mains supply.

An active table microphone is usually not suitable as a replacement for an active handheld microphone, as it is designed as a replacement for a passive microphone.

Low/high microphone impedance

The dynamic microphone elements in transceiver microphones almost all have a low impedance.

  • Old consumer tape recorder microphones almost all have a high impedance of approx. 20 kOhm and are therefore not suitable for connection to transceivers.
  • Professional microphones from the audio world with an XLR connection almost always have a low impedance of 600 Ohms (or are switchable between high and low) and are well suited for a transceiver suitable for a passive low impedance microphone. You will then need a separate PTT switch, though.
en/info/mirophone.txt · Last modified: 2024/04/24 23:25 by bart

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