MSM - HA1 HARRIS UDC 15 PIN (XG75)

L3Harris XG-75 • Tactical Audio Hub MSM — L3Harris 15-Pin UDC (HA1) Modular Speaker Mic for L3Harris P-series and XG-series radios using the legacy 15-pin Universal Device Connector (UDC). Emergency button and high/low volume control are active through the 15-pin interface. The NATO-wired amplified Nexus port bridges these radios to modern tactical headset systems. How It Works ☑ Patrol Mode Use as a standard speaker mic. Clip to shoulder strap or vest. Omni-directional microphone captures voice from any angle — no need to lean into the mic. ☑ Tactical Mode Plug a headset into the Nexus port. Speaker auto-mutes. Audio routes to your ears. The MSM becomes your PTT — press front or side button to transmit through the headset mic. Key Features Dual-Role Operation: Use as a standalone speaker mic for daily patrol. Plug a headset into the Nexus port and the MSM becomes a PTT — speaker auto-mutes, audio routes to your ears. One device, two modes. Dual PTT: Oversized front button for quick keying plus a secondary side button — both work with gloved hands. Emergency Button: Dedicated bright-orange emergency activation button. Sends the radio's programmed emergency alert when pressed. Volume Control: Up/down scroll buttons on the speaker mic body — adjust audio without reaching for the radio. Amplified Nexus Port: NATO-wired Nexus connector with built-in amplification for low-impedance dynamic headsets — Ops-Core AMP, 3M Peltor ComTac, MSA Sordin, David Clark, and other tactical headsets with U-174/U plug. Speaker auto-mutes when headset is connected. IP67 Sealed: Dust-tight and submersible to 1 meter for 30 minutes. Built for rain, mud, and standing water. Radio-Specific Notes The 15-pin UDC is the legacy L3Harris connector found on the XG-75 and P-series platforms. If you have a newer L3Harris radio with the 9-pin UDC (XL-200, XL-185, XG-100P/Unity), use the HA2 variant instead. Compatible Radios L3Harris (M/A-Com) XG-15P, XG-25P, XG-75P, P5300, P5400, P5500, P7300, P7400, PD7100. Headset Compatibility The amplified Nexus port is designed for headsets with dynamic (low-impedance) microphones: ✓ Ops-Core AMP (via U174 Monaural or Monobinaural Downlead) ✓ 3M Peltor ComTac V/VI, SWAT-Tac ✓ MSA Sordin Supreme Pro-X (Mil-Spec) ✓ David Clark H10-76 series ✓ Any NATO-wired headset with U-174/U plug and dynamic microphone Electret microphone headsets are not supported by this amplified variant. Contact us for electret-compatible custom orders. Need a PTT Without a Speaker Mic? The MSM is built for operators who need both modes — speaker mic on patrol, headset PTT on operations. If you run a tactical headset full-time and don’t need a speaker mic at all, the Constant Able is a lighter, simpler, purpose-built PTT. Constant Able PTTs connect directly to your radio with no speaker mic in the chain. Auto-switching impedance detection handles both dynamic and electret headsets automatically — broader headset compatibility than the MSM’s dynamic-only Nexus port. Available for Motorola APX, Motorola XTS, Kenwood, L3Harris, Hytera, Icom, Baofeng, and NATO 6-pin radios. Shop Constant Able PTTs → Find Your Radio → Other Radio Interfaces The MSM is available for other radio platforms. Select the connector that matches your radio: MSM — Kenwood 2-Pin (K1) MSM for Kenwood 2-Pin radios MSM — Kenwood Multi-Pin (K2) MSM for Kenwood Multi-Pin radios MSM — Motorola APX (M9) MSM for Motorola APX radios MSM — Motorola XTS (M4) MSM for Motorola XTS radios MSM — L3Harris 9-Pin (HA2) MSM for L3Harris 9-Pin radios Specifications Spec Value Radio Connector L3Harris 15-Pin UDC Headset Port Nexus (U-174/U) — NATO wired (Amplified) Earpiece Port 3.5 mm listen-only Microphone Omni-directional, −42 dB ±3 dB Speaker 36 mm dynamic, 1 W (1.5 W max), 91 dB ±3 dB PTT Dual — oversized front + secondary side Emergency Dedicated button (bright orange) Volume Up / Down scroll control IP Rating IP67 (dust-tight, 1 m submersion / 30 min) Cable Kevlar-reinforced coil cord, 50,000 flex cycles, 13 kg pull strength Temp Range −25°C to +60°C operating Frequency Range 580 Hz – 5 KHz PTT Switch Life 100,000 cycles DISCO32 SKU MSM-50-HA3-03A DISCO32 Tactical Antennas — Aberdeen, NC Amplified/Modified by DISCO32 • 1-Year Warranty Compatible radios (Harris UDC 15-Pin) Built for the Harris UDC 15-Pin accessory interface used on these manufacturer radio models: XG-75P XG-75 P5500 P5400 P5300 Platform names: Harris UDC, 15-pin UDC. Modular Speaker Mic (MSM) for remote speaker-mic / RSM use. Confirm plug fit against your radio model before ordering. Match by physical plug and radio model—not third-party chart codes alone.