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Signal chain guide

NATO vs Peltor wiring on U-174

Same shell, different mic wiring. Legacy U-94 expects US NATO. European “Peltor wired” headsets often fail on plain U-94. Constant Able handles both — that is a core reason agencies standardize on CA.

What breaks

If receive audio plays out of the boom mic, or TX has no voice, wiring or impedance is often wrong — not a “dead headset.”

  • US NATO wiring — standard for most DISCO32 legacy U-94 units
  • Peltor / EU wiring — common on some ComTac configurations
  • Dynamic vs electret — CA auto-senses; legacy U-94 needs the right amp choice

What to buy

For mixed fleets and mixed headsets, prefer Constant Able matched to the radio plug, not a random Amazon U-94.

Open DISCO Connect Shop Constant Able help@disco32.com

FAQ

Can I use adapters forever?
Adapters can mask pinout issues but do not fix impedance or wrong radio connector families. Match the radio interface first.
Dual radios?
Dual mono often means two PTTs. Stereo platforms are different. Use DISCO Connect dual-comm path or email help@disco32.com.