Equipment & Components for the Satcom & Microwave/RF Industries

Loop Test Translators
Synthesised LO - Ethernet Control

  • Ka Bands and Ku Bands
  • Simulates Satellite Link
  • All Frequency Combinations
  • Tx-Rx, Tx-L and L-Rx Conversions
  • Fully Versatile
  • Local and Remote Ethernet Control for
        LO Frequency and Signal Attenuation
  • External or Internal 10MHz Reference
  • Standard and Custom Options

The ALR series of Ka Band and Ku Band Loop Test Translators feature Synthesised Variable Frequency Local Oscillators (LOs) to provide the user with the most versatile and comprehensive operating configurations for translation of uplink (Tx) frequencies to either downlink (Rx) frequencies or to L-Band, and for L-Band to downlink (Rx).

These Translators simulate the satellite transponder frequency conversion for system alignment and continuous quality monitoring.

Both the LO frequency and through path attenuation can be controlled either locally with direct readout on the front panel LCD or remotely via Ethernet with a virtual control panel.

-00 Standard
-01 Specific Programmed Frequency Steps
-02 Switchable Internal 10MHz OCXO Reference
  Frequency Stability +/-0.05ppm over 0 to +50C
    +/-0.1ppm per year
-03 Switchable Internal 10MHz OCXO Reference
  Frequency Stability +/-0.005ppm over 0 to +50C
    +/-0.02ppm per year
    +/-0.05ppm all causes in 2 years
-04 60dB Attenuation Range
-05 1.0dB Attenuation Steps
-06 Input/Output Filters for 60dB Isolation
-07 LO Filter for 60dB LO Rejection
-08 Input/Output Isolators for 1.3:1 VSWR and
-20dB Conversion Gain
-09 Internal Amplifier for 0dB nom. Conversion Gain
-10 Dual Redundant Power Supplies - Diode Controlled
-12 Waveguide RF Input
-13 RS422/485 Frequency Control
-14 Outdoor Weatherproof Housing -20 to +70C (No LCD) (click to view data sheet)
-15 Special Custom Options


 General Specifications
 LO Frequency Steps 25MHz
 Maximum Input Level +10dBm
 Conversion Gain -35dB nom. (see options)
 Conversion Gain Flatness +/-2dB typ.
  +/-0.5dB/40MHz max.
 Attenuation Range 30dB min. (see options)
 Attenuation Control 0.25dB Steps
 Impedance 50 ohms
 Input VSWR 1.8:1 typ. (see options)
 Output VSWR 1.8:1 typ. (see options)
 Signal Related Spurious -25dBc typ.
 LO Related Spurious & Harmonics -30dBm typ.
 Non Signal or LO Related Spurious -60dBc min.
 Input Power 80-240V, 50-60Hz
 Input Power Connector IEC with Fuse
 Operating Temperature 0 to +50C (see options)
 Storage Temperature -10 to +70C
 Lock Alarm LED, Front Panel & Ethernet
 Input Connector (see options) 2.92mm Female Ka Band
  SMA Female Ku Band
 Output Connector SMA Female
 Reference Input Connector BNC Female
 Ethernet Connector RJ45
 Size 19" x 1U x 13.5" (343mm)
  incl. connectors & protrusions

LO Phase Noise (dBc/Hz) typical
Offset Frequency (Hz) LO Frequency (GHz)
2.0 10.0 12.0 27.0
100 -80 -70 -65 -60
1K -90 -85 -75 -70
10K -95 -90 -80 -75
100K -95 -90 -80 -80
1M -120 -115 -115 -110

Model No Translation Bands Input
Frequency in Range
Frequency in Range
Frequency in Range
ALR-08801095-Ka Ka Tx-Rx 27.5-31.5 17.7-21.2 8.80-10.95
ALR-25002700-Ka Ka Tx-L 27.5-31.5 0.8-2.6 25.0-27.0
ALR-16901860-Ka Ka L-Rx 0.8-2.6 17.7-21.2 16.9-18.6
ALR-01490330-Ku Ku Tx-Rx 12.75-14.5 10.7-12.75 1.49-3.30
ALR-11801305-Ku Ku Tx-L 12.75-14.5 0.95-2.7 11.8-13.05
ALR-09751005-Ku Ku L-Rx 0.95-2.7 10.7-12.75 9.75-10.05

We reserve the right to change standard product specifications without notice but will be pleased to consider control drawings for quotation.

T: +44 (0)1376 550220 F: +44 (0)1376 552145 E: 40A Springwood Drive, Braintree, Essex CM7 2YN, England