Walker U94 PTT 7.0 Plug Headset Adapters

One wrong plug and the headset never keys the radio.

You have the headset and you have the radio, and they will not talk to each other. The headset lead ends in one fat plug. The radio has a two-pin socket down its side under a rubber flap. There is no version of pushing harder that fixes that.

A U94 push to talk adapter is the part that goes in the middle. The headset plugs into the top of it, a lead runs out the bottom to the radio, and a big rubber button sits on the front face where a gloved hand can find it without looking. A sprung metal clip holds the body on a plate carrier strap, a chest rig or a belt, so the radio itself can stay in a pouch.

Miss a call on the two-way and it runs from minor to catastrophic: injury, machine damage, public liability. Communication is everything. You cannot afford to fail on that.

Which is why the plug on the tail is the whole decision here. The eleven fittings listed above are the same adapter with a different radio connector on the end. Match it to the socket on your radio, then read the Limits tab for the headset wiring, because that is the part that catches people out.

What It Does

• Bridges headset to radio: carries microphone and earphone audio between a 7.0 mm four-pole tactical headset and a handheld two-way set.
• Keys the transmitter: press and hold the front button to talk, let it go to listen. No latch, no voice activation, nothing to set up.
• Puts the button on your chest: you are not digging a radio out of a pouch every time somebody calls you.
• Keeps the set stowed: the radio stays where you put it and only the lead is out in the open.
• Matches your radio brand: seven radio-side connectors across the range — Kenwood, Icom, Midland, Yaesu, Motorola single pin, Motorola two pin, and a 3.5 mm four-pole lead.
• Clips where you need it: a 28 mm metal spring clip on the back grips webbing, a belt or the edge of a pocket.

Key Features

• 7.0 mm NATO headset socket: the four-pole tactical headset plug, not the larger six-pin U-174 type.
• WC001 wiring: the supplier's military-version pinout — microphone negative, earphone positive, microphone positive, earphone negative, tip to sleeve.
• Eleven fittings, two colours: black (BK) and dark earth (DE), with the colour tied to the fitting you pick.
• Body size: 56 × 63 mm across the face and 44 mm deep with the clip fitted.
• Straight lead: 805 mm of plain, non-coiled cable to the radio plug.
• Stated weight: 80 g, so it does not drag on a shirt or pull a strap out of place.
• Polymer shell: moulded polymer body closed with four cross-head screws on the front face.
• Large press: a raised rubber button on the front, big enough to find through a glove by feel.
• Metal belt clip: 28 mm wide and riveted to the back of the body, not glued on.

Limits

It is a reproduction, not a genuine part. The adapter is made by WADSN, and the moulding carries printed MSA branding and a US stock number, NSN 5895-01-518-8817. A European retailer of the identical WC001 part describes it plainly as a reproduction of the MSA push to talk, and that is what it is. Nothing on this page is a claim about a genuine MSA, Peltor or Walker's product, and the printed markings on the body are cosmetic.

There are two wiring versions and they look identical. The supplier builds this plug in a military wiring, code WC001, and a civilian wiring, code WZ113. Same body, same 7.0 mm plug, same size — the middle two contacts are swapped inside. Every fitting on this page is the WC001 wiring. The supplier lists WC001 against original-brand headsets: OPS-CORE RAC and MAP, MSA Sordin, Peltor Comtac, Sordin, Earmor, TCA, FMA, FMC and FCS. It lists the replica headset brands — WADSN, Z-Tactical, WST, TAC-SKY and copy Comtac, Sordin or Earmor — against WZ113 instead. A WC001 will physically plug into a WZ113 headset. The microphone and earphone simply will not land on the right contacts.

"Military" here is a wiring label. It is the supplier's own name for that pinout and it means nothing more than that. No certificate, standard or approval was sighted for this part, and none is claimed for it.

No water rating. We are not going to call it waterproof, because no IP number is published for it anywhere. Rain and sweat off a strap is one thing; a soaking, a dunking or a pressure hose is another, and there is no figure to tell you where the line sits.

The fitting cannot be changed later. The lead is fixed into the body and the supplier builds a separate part number for every connector. The fitting you choose is the fitting you keep.

There is no six-pin option. If your radio takes the six-pin U-174 NATO connector, the sort fitted to a PRC-148 or PRC-152, none of the eleven fittings here will suit it.

Nothing else is in the box. The adapter and its lead, and that is all. No headset, no radio, no spare plug and no second cable.

Q & A

How do I work out which fitting I need?

Look at the accessory socket on the side of your radio, under the rubber flap. One 3.5 mm and one 2.5 mm jack set at right angles is Kenwood, which is the same socket used on a Baofeng UV-5R or BF-888S, a Wouxun or a TYT. Two straight round pins in a wide flat plug is Icom. Two pins in an angled, textured plug is Midland. A single right-angle 2.5 mm pin is Motorola single pin, the Talkabout style. Two straight pins in a right-angle body is Motorola two pin. Yaesu and Vertex Standard use their own right-angle plug. The 3.5 mm option is a plain four-pole plug for a phone or anything that takes one.

Will it fit my headset?

The socket on top takes a 7.0 mm four-pole NATO plug — the plug fitted to a Comtac, Sordin, Earmor or TCA style tactical headset. Count the metal bands on your headset plug: four bands is the right family. If your headset ends in a large screw-collar six-pin plug, that is the U-174 type and it will not go in.

My headset is a WADSN, Z-Tactical or TAC-SKY. Is this the right one?

On the supplier's own list, no. Those brands sit against its WZ113 civilian wiring, and every fitting on this page is the WC001 military wiring. It will plug in and it will feel right in the hand, but the microphone and earphone contacts sit in different places. Match the wiring to the headset you already own.

Does the Kenwood fitting work on a Baofeng?

Unconfirmed, and the sources disagree. The connector is the two-pin Kenwood plug, physically the same socket a Baofeng UV-5R or BF-888S uses, and the supplier's own applicability line names Baofeng. Two European retailers of the identical WC001 part state the opposite. Nobody here has put one on a Baofeng, so treat it as unproven rather than settled either way.

How long is the lead, really?

805 mm, which is the figure two separate retailers of the same WC001 part publish. The supplier's own dimension drawing prints 80 mm against the cable, and that cannot be right, because the body alone is 63 mm tall in the very same drawing. We publish the 805 mm figure and we have not put a tape over one.

Can I run it in the wet?

There is no ingress rating published for it, so there is no honest answer beyond common sense. It is a polymer body with a captive lead and a rubber button, worn on the outside of your kit. Working in drizzle is a different thing to a river crossing, and only one of those is a fair ask of an unrated part.

Specs