Yaesu M-90D Dynamic Desktop Microphone for HF Transceivers

The Yaesu M-90D is a dynamic desktop microphone designed for amateur radio operators who want clear, comfortable and well-balanced transmitted audio with compatible Yaesu HF transceivers.

This model uses a dynamic microphone element tuned to provide a rich low-to-mid frequency response, giving the voice a natural, clear and defined character suitable for long conversations, local contacts, DX and daily SSB operation.

The microphone structure, together with the windscreen cover and directional element, helps focus voice pickup from the front while reducing side and ambient noise. This makes the M-90D a practical solution for stations where improved transmit audio is desired without the need for complex external audio processing.

The microphone includes a built-in Low-Cut filter with a 340 Hz cut-off frequency and -6 dB/octave slope, helping reduce excessive low frequencies and produce cleaner, more intelligible transmitted audio. A built-in isolation transformer is also integrated into the internal circuit to help enhance audio quality.

The PTT key uses a smooth operating system with three air-cylinder tubes, similar to Yaesu reference microphones, providing a firm and comfortable feel during extended operation. For long conversations, the LOCK key allows continuous transmit operation without keeping the PTT pressed.

The M-90D provides connection options for Yaesu HF transceivers equipped with either a round 8-pin microphone connector or an 8-pin modular microphone connector, using the supplied cable.

Main features

• Desktop microphone for amateur radio stations
• Brand: Yaesu
• Model: M-90D
• Microphone type: dynamic
• Voice response tuned for low and mid frequencies
• Directional element for improved front voice pickup
• Helps reduce side and ambient noise
• Built-in Low-Cut filter
• Low-Cut frequency: 340 Hz
• Filter slope: -6 dB/octave
• Built-in isolation transformer
• Smooth PTT operation
• PTT system with three air-cylinder tubes
• LOCK key for continuous transmit
• Adjustable microphone angle
• Compatible with Yaesu HF transceivers using round 8-pin or 8-pin modular microphone connectors
• Ideal for SSB, DX, contesting and daily base-station operation

Technical specifications

• Supply voltage: 5.0V DC ±10%
• Typical current consumption: 15 mA
• Type: dynamic microphone
• Frequency response: 30–17000 Hz
• Sensitivity: -60 dB, at 1 kHz, 0 dB = 1V/1Pa
• Microphone impedance: 600 Ω
• Dimensions: 106 x 192 x 126.5 mm
• Approximate weight: 530 g, without cable
• Supported connections: round 8-pin / 8-pin modular, depending on compatible transceiver

Indicated compatibility

Compatible with several Yaesu HF transceivers, including:

• FTDX101D
• FTDX101MP
• FTDX10
• FTDX9000
• FTDX5000
• FTDX3000D
• FTDX1200
• FT-2000 / FT-2000D
• FT-1000MP
• FT-1000MP MARK-V
• FT-991 / FT-991A
• FT-891
• FT-950
• FT-920
• FT-900
• FT-897 / FT-897D
• FT-857 / FT-857D
• FT-847
• FT-818ND
• FT-817 / FT-817ND
• FT-450 / FT-450D

Models indicated as requiring the optional microphone power supply kit:

• FT-840
• FT-850
• FT-747
• FT-990
• FT-1000

Package contents

• Yaesu M-90D desktop microphone
• Microphone cable
• Operating manual

Recommended applications

• HF amateur radio stations
• SSB operation
• DX contacts
• Contesting
• Long conversations / ragchew
• Base-station operation
• Improving transmitted audio quality
• Use with compatible Yaesu transceivers

Important note

Before purchasing, confirm compatibility with your exact transceiver model. Some older Yaesu models may require the optional microphone power supply kit. Final transmitted audio quality also depends on radio settings, microphone gain, equalisation, compression and operating conditions.