Intelligent Architecture
Constant Able™ PTT
Motorola Multi-Pin (M3)
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: Motorola Multi-Pin (GP/HT)
Compatible with the legacy Motorola Multi-Pin format commonly found on HT and GP series radios.
Compatible Models:
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GP Series (GP328, GP338, GP340)
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HT Series (HT750, HT1250, HT1550)
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Ailunce / Retevis (HD1, RT29)
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 Motorola Multi-Pin provides basic push-to-talk without auto-sensing — available in dynamic or electret variants.
Compatible radios (EX / GP328+ Multipin)
Built for the EX / GP328+ Multipin accessory interface used on these manufacturer radio models:
- EX500
- EX600
- GP328 Plus
- GP338 Plus
- HD1
- RT29
Platform names: EX multipin, GP328 Plus.
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.
