User guide for the Poly SHS1890 PTT Amplifier, compatible with H-Series headsets and featuring selectable switch modes and three coil cord options.
The Poly SHS1890 PTT Amplifier is a carbon-type microphone amplifier designed for mission-critical applications. It features a PJ-7 connector and supports both momentary and locking switch operations. Compatible with H-Series headsets, it offers three coil cord lengths (10, 15, and 25 feet) for flexible deployment. The device is CE compliant and includes a 2-year warranty.
Technical specifications cover operating current (10–120 mA), temperature ranges (0°C to 50°C operating, -40°C to 66°C storage), microphone output level (-23.5 ± 5 dBV), frequency range (300–3300 Hz), and distortion (<5%). It supports various receiver types and includes a solid-state acoustic limiter for noise reduction.
| Operating Current Range | 10 to 120 mA dc |
|---|---|
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Storage Temperature | -40°C to 66°C (-40°F to 151°F) |
| Microphone Output Level | -23.5 ± 5 dBV (37.6 to 119 mV RMS) |
| Frequency Range | 300 to 3300 Hz |
| Distortion | < 5%, 300 to 3300 Hz |
| DC Resistance | > 35 ohms |
| Impedance | 50 ohms |
| Polarity | Nonpolar |
| Terminal Voltage | 2.3 Vdc @ 10 mA; 5.0 Vdc @ 100mA |
| Warranty | 2 years |
Options include 10-foot (SHS1890-10), 15-foot (SHS1890-15), and 25-foot (SHS1890-25) coil cords.
The operating temperature range is 0°C to 50°C (32°F to 122°F).
The SHS1890 comes with a 2-year warranty.