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Iridium Communications, Inc.
Iridium 9523 Product Developers' Guide
Revision 2.6
4.3 Radio Characteristics
Table 14 contains radio characteristics of the Iridium 9523.
Average Power during a transmit slot (max)
Average Power during a frame (typical)
Receiver sensitivity (Typical level at connector)
Note 1: Cable losses should be minimized. The total implementation loss for an antenna, connectors,
cable, lightning arrestor and any other RF component between the Iridium 9523 and the antenna should
not exceed 3 dB. Implementation loss higher than this will affect the Iridium link performance and quality
of service. Solutions with a loss higher than 3 dB will not meet the requirements of Iridium Solution
Certification.
Note 2: Link Margins are given assuming a free-space propagation model.
4.4 S-meter Performance
The numbers reported over the AT command interface indicate the signal strength of the ring channel.
Care should be taken when using the S-meter readings for comparisons between devices. Of particular
note are the following:
1. There is a 0.5 dB tolerance on calibrating the S-meter.
2. Each bar represents a 2 dB increment.
3. Multiple ring channels can be present at the same time so units can lock to different signals.
4. If the reading is near the decision threshold it would be easy to see a 1 bar difference.
Iridium Communications, Inc.
Proprietary & Confidential Information
Only
Table 14: Radio Characteristics
Parameter
Max Cable loss permitted (Note 1)
Link Margin – Downlink (Note 2)
Link Margin – Uplink (Note 2)
Page 31 of 115
Information Contained in this Guide
is Subject to Change Without Notice
Value
7 W
0.6 W
-118 dBm
3 dB
12 dB
12 dB
Distribution of Guide Restricted
to Product Developers
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