The QMA connector is a quick disconnect version of the SMA connector and shares the same internal construction, which allows the connector to have excellent performance up to 6 GHz. Because of the innovative coupling mechanism, a 360-degree butt joint is maintained resulting in low RF leakage. Since the RF line is identical to the SMA series, the QMA connectors also offer the same high power handling capability. This gives the series significant advantages over other quick disconnect connectors.
Mechanically, the QMA series offers a more convenient installation than SMA connectors. Because the interface mates with a snap-on instead of a threaded coupling, there is a significant time advantage. Typically, these connectors can be installed into a system 10 times faster than an SMA connector. Another benefit of eliminating the threaded coupling is the denser packaging. The pitch between connector can be reduced because there is no requirement for wrench clearance. Connectors can be rotated 360 degrees after they are mated which greatly improves the flexibility of installations.
FEATURES AND BENEFITS
Snap-on interface for quick and easy installation
50 Ohm nominal impedance
Rotatable 360° after connection for flexibility with installation
APPLICATIONS
Antennas
Base stations
GPS
QMA SPECIFICATIONS
| Electrical | |
| Impedance | 50 Ohms |
| Frequency Range | DC-18 GHz |
| Screening Effectiveness | |
| DC-3 GHz | -80 dB min |
| 3-6 GHz | -70 dB min |
| Contact Resistance | |
| Center Contact | 2.5 mΩ max (initial) |
| Outer Contact | 3.0 mΩ max (initial) |
| Passive Intermodulation | -120 dBc @ 1.8 GHz 2x 20W static |
| Insulation Resistance | 5x103 MΩ min (initial) |
| Power Handling | 150 W @ 2.5 GHz typical |
| Dielectric Withstanding Voltage (Sea Level) | 1000 VRMS 50 Hz |
| Working Voltage (Sea Level) | ≤ 480 VRMS 50 Hz |
| Environmental | |
| Temperature Range | -40⁰C to +85⁰C |
| Thermal Shock | IEC 60169-1 16.4 (-40⁰C/ +85⁰C) |
| Corrosion | IEC 60169-1 16.7 (48 hrs) |
| Damp Heat | IEC 60169-1 16.3 (96 hrs) steady state |
| Vibration | IEC 68-2-64 random |
| 5-20 Hz | 1.29 (m/s2)2 /Hz |
| 20-500 Hz | -3dB/octave |
| Mechanical | |
| Interface Retention Force | 60 N min |
| Durability (Matings) | 100 mating cycles min |
| Connector Pitch | 12.4 mm min center to center |
| Engagement Force | 25 N typical |
| Disengagement Force | 20 N typical |