Intelligent Architecture
Constant Able™ PTT
Kenwood 2-Pin (K1)
The most capable, broadly compatible Push-to-Talk for two-way radios on the market. Developed with SRT and SWAT operators to tackle the toughest interoperability challenges.
Auto-Sensing
The Intelligence Core
Push-to-talks aren’t just an accessory—they’re the core of comms. The Constant Able uses embedded proprietary algorithms to decide, rewire, and adjust gain within 100ms.
Microphone Support
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✓Dynamic (Low Impedance / Mil-Spec)
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✓Electret (High Impedance / Civilian)
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✓150 Ohm Variants
Wiring Handling
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✓US NATO Standard
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✓Peltor Wired (EU Standard)
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✓No switches. No reprogramming.
Radio Interface: Kenwood 2-Pin
Standard 2-Pin connector used by Kenwood, Baofeng, and Wouxun radios.
Compatible Models:
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Kenwood TK/NX (2-Pin)
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Baofeng (UV-5R, BF-F8, 888S)
- Wouxun / TYT
Proven Compatibility
Field-proven with professional comms gear:
Peltor Comtac II–VIII Ops-Core AMP MSA Sordin OTTO NoizeBarrier N•Ear 360
Connectors: U-174/U (NATO J11) or U-384 (Dual Comm Split Audio*) — If your headset downlead has red rings, you will require the TP-105 O-ring.
Mission Specs
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⚡ Zero batteries required
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🌊 IP67 Sealed (Waterproof/Dustproof)
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🛡️ Integrated hot mic shroud
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🔄 Rotating ambidextrous clip
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🇺🇸 Buy American Act Compliant
Compatibility Note
DISCUS pairing: DISCUS requires a dynamic (low-impedance) microphone. You can run DISCUS in-line with Constant Able when the headset mic is dynamic. If your headset uses an electret or amplified boom mic, use Constant Able alone — DISCUS will not drive those mics.
If the downlead on your headset has red rings, you will require the TP-105 O-ring as an addition to this PTT. Red rings typically indicate the U-384 (Dual Comm Split Audio*) configuration.
Mission Add-ons
Looking for the legacy option? The U-94/A Kenwood 2-Pin provides basic push-to-talk without auto-sensing — available in dynamic or electret variants.
Note for 2-Pin Users
While the majority of radio platforms provide VCC (accessory power), the Constant Able is specifically engineered for universal interoperability. For 2-pin radios lacking a dedicated VCC line, the internal Flux Board utilizes a self-sustaining power-harvesting mode. This system safely draws microscopic amounts of energy to maintain premium audio routing and automatic sensing without external power sources.
Maintenance: To support this ultra-low maintenance design, if left disconnected for over 40 days, simply plug the unit into a powered-on radio for 6 to 10 minutes - to replenish the reserves and resume flawless operation.
Compatible radios (Kenwood 2-Pin)
Built for the Kenwood 2-Pin accessory interface used on these manufacturer radio models:
- TK-340
- TK-2400
- TK-3402
- TK-3201
- TK-2100
- NX-1200
- NX-1300
- UV-5R
Platform names: Kenwood 2-pin, K-pin.
Constant Able PTT with auto impedance sensing for dynamic and electret headsets. No batteries required. Match by physical plug and radio model—not third-party chart codes alone.
