Equipment & Components for the Satcom & Microwave/RF Industries

Ka Band - Loop Test Translators
Fixed LO - Manual Attenuation Control

  • Ka Bands – 27.5 to 31.5 GHz
  • Up to 3.5 GHz Bandwidth
  • LO Frequencies 9.80 & 10.30 GHz
  • Simulates Satellite Link
  • High Stability
  • Low Phase Noise
  • Gain Adjustment
  • 1U Rack Height
  • Custom Options

The ALT series of Ka Band Loop Test Translators are designed to replace the satellite link for test and alignment of earth station systems operating in the Ka frequency bands. Incorporating fundamental frequency phase locked oscillators and double balanced mixers, the translators block convert frequencies from uplink to either downlink or L-Band for instantaneous monitoring of frequency, power levels and modulation. The input path contains a front panel controlled continuously variable attenuator for reducing input power levels. Each unit also provides a reference frequency output and LO lock alarm.

-00 Standard
-01 10MHz Int. Ref.
-02 50MHz Ext. Ref
-03 10MHz Ext. Ref.
-04 OCXO Int. Ref.
-05 TCXO Int. Ref. +/- 1ppm
-06 Programmed LO Frequency
-11 Switched Ext. LO
-12 Exclusive Ext.LO
-13 500MHz Bandwidth
-14 1000MHz Bandwidth
-21 0dB Conversion Gain
-41 Waveguide Input WR28
-42 Waveguide Output WR42
-43 Connectors on Front Panel

Custom Options:

 General Specifications
 Maximum Input Level +10dBm
 Conversion Gain -35dB nom.
 Conversion Flatness +/-2dB typ.
+/-0.5dB/40MHz max.
 Attenuation Range 30dB min.
 Impedance 50 ohms
 Input VSWR 1.8:1 typ.
 Output VSWR 1.8:1 typ.
 Standard LO Frequency Stability +/-5ppm max. over 0+50C
+/-2ppm typ. over +10+40C
+/-2ppm/day max.
 Internal Reference 50MHz or 100MHz standard
 Reference Output (optional) As internal reference
 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+50C
 Storage Temperature -40+85C
 Attenuation Control 10 turn with dial, front panel
 Lock Alarm LED, front panel
 Standard RF Input Connector 2.92 mm female, rear panel
 Standard RF Output Connector 2.92 mm female, rear panel
 Ref. Monitor Connector (optional) SMA female, rear panel
 Size 19" x 1U x 13.5" (343mm) incl. connectors & protrusions
Fixed LO Phase Noise (dBc/Hz) (typical)
Offset Frequency (Hz) LO Frequency (GHz)
9.80 10.30
100 -56 -56
1K -90 -90
10K -100 -100
100K -110 -110
1M -120 -120

Model No. Translation
Frequency Range
Frequency Range
ALT-9800-Ka Ka Tx-Rx 27.5 - 31.0 17.7 - 21.2 9.80
ALT-10300-Ka Ka Tx-Rx 28.0 - 31.5 17.7 - 21.2 10.30

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