Intelligent Architecture
Constant Able™ PTT
APX / GCAI (M9)
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 APX (GCAI)
The standard Global Connector Accessory Interface (GCAI) used by millions of public safety professionals.
Compatible Models:
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APX Series (8000, 7000, 6000, 4000, 1000)
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SRX 2200 (Combat Radio)
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XPR Series (6000, 7000 Series)
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.
Compatible radios (GCAI)
Built for the GCAI accessory interface used on these manufacturer radio models:
- APX 1000
- APX 4000
- APX 6000
- APX 6000XE
- APX 7000
- APX 8000
- APX 8000XE
- APX NEXT
- SRX 2200
- XPR 6550
- XPR 7550e
- XPR 7350e
- XPR 7000e
Platform names: GCAI, ASTRO APX, MOTOTRBO XPR, APX series.
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.
