Model # QBS-611 RF Adjustable AGC/Limiting Line Amplifier L-Band 1.0 – 2.0 GHz • Adjustable Small-Signal Gain, AGC Output Threshold, Minimum Gain, and Maximum Output Power • Uses GaAs MESFET and E-pHEMT Technologies • Variable AGC and Limiting Module • Class A Output Stage • Microprocessor Based Control Loop API Technologies’ Model QBS-611 is an automatic gain control/limiting line amplifier module covering 1-2 GHz. This design provides variable small-signal gain, AGC output power threshold, minimum gain, and maximum output power settings. The QBS-611 allows for adjustment, via mechanical set screw, of four key operating parameters to allow for ease of integration and system alignment. Technical Specifications Mechanical Case Dimensions 5.0” (L) x 3.0” (W) x 1.2” (H) Material 6061-T6 Aluminum Alloy Finish Clear Iridite MIL-DTL-5541F Type II, Class 3 Weight 16 oz. (max) Grounding Chassis Outline Drawing 080-23035 Connectors ± RF Input N-Type Female (4-Hole Flange) RF Output N-Type Female (4-Hole Flange) DC Power 9 Pin D-Sub (Male) Standard Density Environmental Parameter Specification Comments -40⁰C to +70⁰C - +90⁰C - Storage Temperature -55⁰C to +125⁰C - Cooling Adequate Heat Sink Required Conduction 0 to 90% Non-condensing 0 to 10,000 ft. Above Sea Level Operating Case Temperature Absolute Maximum Case Temperature General Control / Interface Signals AGC Bypass → TTL Logic Summary Fault Indicator → Open-Collector 200,000 hrs. +50⁰C Ground Fixed Environment MIL-HDBK-217F MTBF 5/8/2014 Relative Humidity Altitude 1 Model # QBS-611 Notes 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Specification ratings are based on measurements in a 50 ohm system. Damage may occur at input levels above +8dBm. Adjustable via external set screw. Valid for output power levels below AGC threshold Power level measured at output connector. Measured with input power level of -20 dBm. Measured across entire frequency band under all gain/output power conditions. Measured across any 120MHz band under all gain/output power conditions. All set screws adjusted to nominal values with power levels up to -13dBm. Alternate DC power supply voltages available as a custom solution. Outline Drawing 5/8/2014 2