Globalstar Product Management – Technical Support

GSP-1620 Antenna Cable Losses

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(Reference SDM IRM pg. 7-25)

RF cables for the GSP-1620 must meet the following “allowable loss” characteristics.

  • Maximum Loss: 0.655 dB at 1626MHz for Tx cable

  • Maximum Loss: 3.0 dB at 2500MHz for Rx cable

LMR-100

  • Tx (max 0.655dB) Up to 17 inches

  • Rx (max 3.0dB) Up to 7 feet

LMR-195

  • Tx (max 0.655dB) Up to 36 inches

  • Rx (max 3.0dB) Up to 14.7 feet

As you can see, the length of the GSP-1620 cables is determined by the allowable RF loss of the Transmit cable, which has a maximum allowable loss of 0.655dB at 1626MHz, including ALL cable terminations and ALL cable adapters. 

Globalstar offers the following two cable assemblies:

  • 17-inch LMR100

  • 36-inch LMR195

Some integrators prefer to mix cable types for the Tx and Rx links in order to simplify installation; it is more difficult to install two thick cables than it is to install a thick and a thin cable.  This is permissible as long as the respective losses are within the specification.  Therefore, the following Tx/Rx cable pairs could be used:

  • 17-inch ==> LMR-100 for both Tx and Rx

  • 36-inch ==> LMR-195 (Tx), LMR-100 (Rx)

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Written by Joseph Crowley

September 20, 2008 at 11:54 pm

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