Part Number: QBS-544 25 Watt Power Amplifier 1 to 50 MHz High Dynamic Range, Class AB Design for the HF Band Features • • • • 35 Watts Typical @ P1dB Power Feedback Technology 1.0 dB Noise Figure Exceptional Intermodulation Performance 3rd Order Intercept: +59 dBm Typical 2nd Order Intercept: +82 dBm Typical API Technologies’ Model QBS-544 is a medium power class AB amplifier utilizing power feedback technology to deliver exceptional performance over the HF band for military communications, distribution networks, and medical equipment. The dual directional coupler feedback architecture provides low loss and superior isolation resulting in excellent gain stability, very repeatable unit-to-unit performance, and low VSWR in and out over the entire 1 – 50 MHz band. At a nominal DC input voltage of +28V, the QBS-544 offers 29 dB of gain, a very low noise figure of 1.0 dB typical, and a minimum 1 dB compression of +44 dBm; drawing 1.8 amps at this level. An optional heat sink and environmental screening are available upon request. Technical Specifications (1) Absolute Maximum Ratings Parameter Unit Typical 25°C Min/Max 0°C to +50°C Frequency Range MHz 1 - 50 Small Signal Gain dB Parameter Specification 1 – 30 DC Voltage +32.0 Vdc 29 28 min. RF Input Power +23 dBm dBm +45.5 +44.0 min. Reverse Isolation dB 42 38 min. Operating Case Temperature (3) -20oC to +85oC Input VSWR — 1.2 :1 1.5 :1 max. Storage Temperature -45oC to +125oC Output VSWR — 1.4 :1 1.6 :1 max. Noise Figure dB 1.0 2.0 max. 3rd Order Output IP dBm +59 — 2nd Order Output IP dBm +82 — DC Voltage Vdc +28 +28 DC Current (Quiescent) A 1.0 1.1 max. DC Current @ P1dB A 1.8 2.2 max. POUT @ 1dB Compression (2) Mechanical Specifications Parameter Package (non-hermetic) Finish Specification Comments API Dwg: 080-23065 6061-T6 Al Alloy Clear Iridite MIL-DTL-5541F, Class 3 Captivated SMA Female 2-Hole Flange Mount DC Power (+VDC) Filtered Feed Thru Solderable Ground Terminal Threaded Turret Solderable Adequate Heat Sink Required Note 4 RF In/Out Connectors Cooling Notes: 1. Specification ratings are based on measurements in a 50 ohm system with a DC supply voltage tolerance of ± 2%. 2. Noise figure performance guaranteed from 5 to 30 MHz. 3. Maximum Operating Case Temperature is defined as the baseplate temperature which, if exceeded for extended periods, could result in premature unit failure. This data is provided for user reliability information. This may or may not represent the maximum temperature for electrical parameter specifications. 4. Package Configurations • QBS-544: Standard Amplifier (Figure 1). • QBS-544-01: Amplifier mounted on a heat sink (Figure 2). | +1.888.553.7531 Rev Date: 5/15/2014 © API Technologies Corp. Proprietary Information Page # 1 | www.apitech.com | micro.apitech.com | [email protected] Part Number: QBS-544 Outline Drawing for QBS-544 (Figure 1) Outline Drawing for QBS-544-01 (Figure 2) Rev Date: 5/15/2014 © API Technologies Corp. Proprietary Information Page # 2 | www.apitech.com | micro.apitech.com | +1.888.553.7531 | [email protected]