Globalstar Product Management – Technical Support

(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)