HP 11757B Multipath Fading Simulator/Signature Test Set

The HP 11757B characterizes the equalizers in modern digital microwave radios by introducing a precisely-controlled notch in and around the radio's transmission bandwidth. This allows precise measurements of the equalizers' ability to compensate for multipath fading. Testing susceptibility to multipath conditions is especially important since fading is recognized as one of the predominant causes of unacceptable bit error rate and link outages. The HP 11757B offers accurate, economical multipath testing and records measurements automatically on a built-in printer.

[ Features ]

Automatic multipath signature measurements
Measures and prints static M-curves, dynamic M- and S-curves, recovery signatures, recovery times, and dispersive fade margin
High-performance, lightweight, and economical

[ Specifications ]

Partial Specifications

Notch Frequency
Ranges
   Standard:                  40 MHz to 100 MHz
   Opt 140:                   110 MHz to 170 MHz
   Opt 147:                   40 MHz to 100 MHz and 110 MHz to 170 MHz

Resolution:                   0.1 MHz

Accuracy (measured at 20 dB notch depth):
                              ±0.3 MHz in 70 MHz band
                              ±0.4 MHz in 140 MHz band

Typical Notch Frequency Accuracy (at 25 °C)
   Absolute Accuracy:         ±0.15 MHz
   Relative Accuracy:         ±ą0.8% per change in frequency or
                              0.03 MHz whichever is greater
   Repeatability and 24 hr drift (at 25 °C):
                              ±0.03 MHz

Notch Depth
Range:                        0 to 40 dB

Resolution:                   0.1 dB

Accuracy
        
        Notch
        Depth      Accuracy
        -------------------
        20 dB      ±0.75 dB
        30 dB      ±1.50 dB
        40 dB      ±3.00 dB

Typical Notch Depth Accuracy

        Notch              15 °C to     Repeatability and
        Depth   at 25 °C   35 °C        24 hr drift (at 25 °C)
        -----------------------------------------------------
	20 dB   ±0.2 dB    ±0.50 dB     ±0.03 dB
	30 dB   ±0.3 dB    ±0.75 dB     ±0.10 dB
	40 dB   ±1.0 dB    ±2.00 dB     ±0.30 dB

Flat Fade
Gain Range:                   0 to 12 dB

Attenuation Range:            0 to 50 dB

Resolution:                   0.1 dB

Accuracy (from 0 dB to 30 dB flat fade)
                              ±2 dB

Typical Gain/Flat Attenuation (at 25 °C)
Accuracy (from 0 dB to 30 dB flat fade measured at 70 MHz and 140 MHz)
                              ±0.4 dB



Supplemental Characteristics

Signature Types:              Static M-Curve, Dynamic M-Curve,
                              Dynamic S-Curve, Hysteresis

Recovery Time
Range:                        5 msec to 5 sec

Accuracy:                     1 msec

Resolution:                   1 msec

Measurement Speed:            <1 minute

Sweep
Range:                        10 msec to 99.9 sec

Resolution:                   0.01 sec

Maximum Slew Rate
   Notch Frequency:           6000 MHz/sec
   Notch Depth:               4500 dB/sec
   Gain/Attenuation:          6500 dB/sec



General Characteristics

Power Consumption
Line Voltage:                 100, 115, 120 or 220, 230, 240 ą10%

Line Frequency:               48 to 66 Hz

Power Dissipation:            <200 VA

Size:                         213 mm H x 366 mm W x 460 mm D
                              (8.4 in x 14.4 in x 18.1 in)

Weight:                       9 kg (20 lbs)

[ Ordering ]

HP 11757B Multipath Fading Simulator/Signature Test Set Opt 001 Delete Printer and Signature Capability Opt 140 140 MHz IF Coverage instead of 70 MHz Opt 147 Both 70 MHz and 140 MHz Coverage Opt 1BN Mil-Standard 45662A Calibration Certificate Opt 908 Rack Mount Opt 909 Rack Mount with Handles Opt 915 Add Service Manual Opt 916 Extra Operating Manual Opt W30 3 Year Return Repair Service Opt W32 3 Year Customer Return Calibration Service Opt W50 5 Year Return Repair Service Opt W52 5 Year Customer Return Calibration Service

HP 11757-60027 Synchronization Cable (one required per pair on instruments for synchronization) HP 11694A 50 Ohm to 75 Ohm Adapter (three required per instrument) HP 1540-1130 Soft Carrying Case HP 82175A Black Print Thermal Paper

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[ Related ]

Related product families available online:

Digital Microwave Radio Test