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M55116 to APX - Dynamic (Low Impedance)

M55116 to APX

$122.00
6-Pin Adapter

Bridge your mil-spec 6-pin NATO PTT to Motorola APX-series radios via the GCAI accessory connector. Available in Dynamic or Electret variants.

Signal Chain

Headset Downlead 6-Pin NATO PTT This Adapter Motorola APX

PTT Side

Input connector (from your PTT):

U-329/U (M55116 6-Pin NATO Female)

Radio Side

Output connector (to your radio):

Motorola GCAI / M9

Dynamic vs. Electret — Which Variant?

Dynamic (Amped)

~150Ω dynamic microphone — requires amplification circuit in the adapter

Headsets: Peltor COMTAC, Ops-Core AMP, MSA Sordin MIL, OTTO NoizeBarrier, Earmor M31/M32

Electret

~2kΩ electret microphone — no amplification needed

Headsets: 3M Peltor LiteCom, commercial/LE electret headsets

Wrong impedance = no transmit audio. Dynamic mics on an electret adapter produce barely audible or silent transmissions. When in doubt, choose Dynamic — most tactical headsets are dynamic.

Compatible Radios (M9 / GCAI)

  • APX Series (8000, 7000, 6000, 4000, 1000, 900)
  • XPR Series (6550, 7550, 7580e)
  • SRX 2200 (Combat Radio)

Warranty

DISCO32 limited warranty — 1 year from original purchase for defects in materials and workmanship under normal use. Support starts with a troubleshooting ticket at help@disco32.com.

Full store policy.

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