The Yaesu M-90MS is a high-grade dynamic microphone kit engineered for amateur radio operators who want to mount their microphone onto a commercial boom arm or floor stand. Delivering the same recognized acoustic quality as the desktop M-90D, this kit utilizes a suspended yoke bracket mount to provide clean, crisp, and natural voice modulation tailored specifically for HF, VHF, and UHF phone communications.
The kit features an independent handheld PTT controller with a flexible coiled cord, offering a convenient one-touch transmission lock and release mechanism. It also integrates a switchable Low-Cut filter (cutoff frequency at 340 Hz, -6 dB/octave) directly on the handheld controller to effectively attenuate unwanted low-end rumble, ambient room noise, and power supply hum, maximizing punch and voice intelligibility through crowded pile-ups and difficult band conditions.
Key Advantages
- Boom Arm & Desk Stand Ready: Heavy-duty mounting yoke with standard W3/8 threads fits commercially available desk boom arms and microphone floor stands.
- Tuned Dynamic Element: Wide 30 Hz to 17 kHz frequency response optimized for warm, articulate voice presence in SSB, AM, and FM.
- Ergonomic Handheld PTT Switch: Cylindrical hand-operated PTT control that locks into transmit on the first press and disengages back to receive on the second press.
- Integrated Low-Cut Filter: Easily accessible covered slide switch cuts frequencies below 340 Hz to clear up background noise and enhance voice penetration.
- Direct 8-Pin Modular Connectivity: Terminated with a standard RJ-45 modular plug for modern Yaesu transceivers (compatible with round 8-pin jacks via optional SCU-53 cable).
Recommended Applications
Ham Radio Shacks, DXing, and Contesting
Frees up valuable desk space by suspending the microphone on a boom arm while keeping the PTT button comfortably in hand.
Long Operating Sessions & HF Ragchewing
The latching PTT function eliminates the strain of continuously pressing a desktop button during lengthy transmissions.
Technical Specifications
| Feature | Specification |
|---|---|
| Brand and Model | Yaesu M-90MS Kit |
| Microphone Type | Dynamic |
| Frequency Response | 30 – 17,000 Hz |
| Sensitivity | -60 dB (1 kHz, 0 dB = 1 V/Pa) |
| Microphone Impedance | 600 Ω |
| Low-Cut Filter | Cut-off frequency 340 Hz, -6 dB/octave (switch selectable) |
| Supply Voltage | DC 5.0 V ±10% (supplied by transceiver) |
| Current Consumption | 15 mA (typical) |
| Mounting Nut Thread | W3/8 Nut |
| Transceiver Connector | 8-pin modular connector (RJ-45) |
| Microphone Head Dimensions | Diameter: 62 mm (2.45″) × Length: 162 mm (6.38″) |
| Weight | Approx. 200 g (7.05 oz) with bracket, without PTT controller |
Key Highlights
- Complete dynamic microphone kit designed for boom arms and floor stands.
- Acoustically tuned dynamic element for clear and crisp communications.
- Dedicated handheld PTT switch with transmission lock feature.
- Integrated Low-Cut filter to remove unwanted low-frequency background noise.
- Adjustable pivot yoke with angle adjustment screws and lock washers.
- Plug-and-play compatibility with modern modular RJ-45 Yaesu radios.
Package Contents
- 1x Yaesu M-90MS Microphone Body.
- 1x Yoke Mounting Bracket.
- 1x Handheld PTT Switch Controller with coiled cord.
- 1x Straight Microphone Connection Cable.
- 1x W3/8 Mounting Nut.
- 1x Hardware Set (Angle adjustment screws, washers, lock washers).
- 1x Operating Manual.
- Note: Microphone stand or boom arm is not included.
Frequently Asked Questions
Does this kit include a boom arm or desk stand?
No, the kit includes the microphone, yoke mounting bracket, W3/8 adapter nut, and PTT controller. The articulated boom arm or floor stand must be purchased separately.
Can I connect it to Yaesu transceivers with a round 8-pin connector?
Yes, connecting the M-90MS to transceivers equipped with a round 8-pin microphone jack (such as the FTDX5000, FTDX3000, or FT-2000) requires the optional Yaesu SCU-53 adapter cable.
What does the Low-Cut switch do?
Activating the Low-Cut switch cuts off audio below 340 Hz, helping suppress AC hum, ambient fan noise, and deep acoustic resonance for crisper vocal punch.
