Satellite Link Emulator – SLE900


  • The SLE900 replaces the SLE700 and provides wider bandwidth, improved noise floor, and also adds optional AWGN and multipath fading with up to 6 taps per channel. The instrument can be configured with 1 to 4 channels.  There are three RF bandwidths currently available: 72 MHz bandwidth centered at either 70 MHz or 140 MHz, 125 MHz bandwidth centered at 140 MHz, and 250 MHz bandwidth centered at 1200 MHz. Link impairments include delay, Doppler, attenuation, phase offset, AWGN, and multipath. Parameters can be set to fixed values in Static mode, or continuously changed in real time in Dynamic mode without any phase discontinuities. Ephemeris data files are downloaded via an ethernet connection and stored internally in solid state memory. These dynamic files can have playback rates from 1 Hz to 1000 Hz, and  can be run forward, reverse, continuously looped, or single stepped.

    Remote control can be accomplished by making calls from your test software, or by using the SleControl application program provided with the instrument. This application provides control of all SLE functions, as well as manipulation of the dynamic data files.

    Static and Dynamic Mode Views in the SleControl Ethernet Application



    • Satellite ground equipment testing
    • Payload testing
    • Testing complex links with both space and terrestrial effects

    • Static and dynamic operation
    • Phase continuous delay, Doppler, and attenuation changes
    • AWGN and C/N generation
    • 6 tap multipath fading with Rayleigh, Rician, AOA, k-factor, and correlation controls
    • Ephemeris data generation using SATGEN


    Model Number SLE9072          SLE9125        SLE9250
    Center Frequency 70&140MHz     140MHz         1200MHz
    1 dB RF bandwidth 72MHz             125MHz          250MHz
    Maximum delay per channel 1400 ms           890ms             890ms
    No. of Independent Channels 1, 2, 3, or 4
    RF Input Power 0 dBm max
    RF Output Power 0 dBm max @ 0 dB attenuation
    In-band Spurious Suppresssion -55 dBc typ, -45 dBc max
    (5 dB degradation with 250 MHz bandwidth)
    Noise Floor -141 dBm/Hz typical
    Amplitude Ripple < 0.5 dB p-p, 1.5 dBp-p with 250 MHz BW
    VSWR 1.5:1 max into 50 ohms
    Delay Range:
    0.1 ms to:
    1400 msec @ 72 MHz BW
    890 msec @ 125 MHz BW
    890 msec @ 250 MHz BW
    Static mode:0.1 ns
    Dynamic mode:0.5 psec
    Slew Rate:
    3×10−15 sec/sec up to 20 us/ms
    Relative Accuracy:
    ± 1 ns plus 10 MHz reference
    Frequency Offset Range:
    ± 3.0 MHz
    0.01 Hz
    Absolute Accuracy:
    based 10 MHz reference
    Relative Accuracy:
    ± 0.1 Hz
    Attenuation Range:
    0 dB to 70 dB
    0.10 dB
    Slew Rate:
    >70 dB/ms
    ± 0.20 dB
    Phase Offset Range:
    0 to 180°

    < 1°
    Additive White Gaussian Noise Crest Factor:
    > 16 dB
    Repetition Interval:
    > 24 hrs
    PDF Accuracy:
    < 1% from theoretical Gaussian over 6.66σ
    Noise Bandwidth:
    same as signal passband
    Spectral Density Flatness:
    < 0.1 dB p-p max
    Noise Density Amplitude Range:
    -95 dBm/Hz typ., to instrument noise floor
    Noise Density Amplitude Resolution:
    <=0.01 dB
    Noise Density Amplitude Accuracy:
    <+/- 0.2 dB
    Eb/No Ratio Range:
    – 14 dB to +58 dB
    Ratio Resolution:
    0.01 dB
    Ratio Accuracy:
    +/- 0.2 dB
    Multipath Fading No. of Paths:
    Path Characteristics:
    Dynamic Profile Update Rate:
    1 sec, affecting Doppler, delay, ,AoA, and attenuation
    Distribution Types:
    CW, Rayleigh, Rician, and off
    Spectral Distribution Shape (Ray, Rice):
    [SQRT{1-(f/fd)^2] -1 with 6 dB peak @ fd
    Probability Density Function:
    Within 0.5 dB of theoretical from 10 dB above to 30 dB
    below mean
    Level Crossing Rate:
    <+/-2.5% from theoretical, – 30 dB to +9 dB
    Attenuation Range:
    0 to 30 dB
    Attenuation Resolution:
    0.1 dB
    Doppler Spread:
    0 to 10 KHz
    Doppler Resolution:
    1 Hz
    Delay Range:
    0 to 20 usec
    Delay Resolution:
    1 ns
    Ricean K Factor:
    -10 to 20 dB
    K Factor Resolution:
    1 dB
    0 to 100%, 1% steps
    Angle of Arrival Range:
    0 to 180°
    Angle of Arrival Resolution:
    Dynamic mode Profile Update Rate:
    1, 2, 5, 10, 20, 50, 100, 200, 500, and 1000 msec
    Dynamic Parameters:
    Delay, Frequency Offset, Attenuation, AWGN, Multipath
    Note: Update rate for multipath fading is fixed at 1000 msec
    Update Rate Accuracy:
    Based on 10 MHz reference
    Front panel keypad, LAN, or external signal
    Triggering Accuracy:
    Synchronized to begin on the 2nd update clock after trigger
    Dynamic data file memory size:
    >50 Mbytes
    Control Interface Local:
    Front panel
    RJ45, IEEE-802.3
    Internal Frequency Reference Error < 2.5 PPM
    Primary Power Voltage:
    90-264 VAC autoranging
    48-66 Hz
    300 V A max
    4A slow-blow
    Operating Ambient Temp +10°C to +40°C
    Dimensions 17″ W x 7.0″ H x 21″ D
    Weight 1 Channel:
    32lbs, with option L: 35 lbs
    2 Channel:
    33lbs, with option L: 39 lbs
    4 Channel:
    35lbs, with option L: 47 lbs