User's Manual

Iridium Communications, Inc. Information Contained in this Guide
Iridium Core 9523/9523N Product Developer’s Guide is Subject to Change Without Notice
Revision 7.2 DRAFT4
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Note that the RF connector on the Iridium Core 9523/9523N is not mounted directly to the FA board along
with the user interface connector. It must be attached to the FA board through a coaxial cable.
Note that for safety reasons, the RF connector on the Iridium Core 9523/9523N should not be directly
connected to an external antenna cable or cable distribution system. Paragraph 7.3 of EN60950-1:2006
safety standard requires that users are protected against high voltages that might appear on these
cables. This can be achieved either by inserting a high-voltage isolating capacitor in series with the signal
or by grounding the shield of the coaxial cable. The I-PEX connector has limited voltage capacity;
therefore protection needs to be provided on the FA board. Developers are encouraged to review the
EN60950-1:2006 standard for additional details.
4.1.1 Antenna Characteristics
The Iridium Core 9523/9523N should be connected to a certified Iridium-band antenna with the following
antenna connector characteristics as described in Table 15.
Table 15: Antenna Characteristics
Parameter
Value
Impedance
50 Ohms nominal
Gain (maximum)
3 dBi
Polarization
RHCP
VSWR (maximum operational)
1.5 : 1
Existing qualified Iridium antennas may be used. (i.e. antennas designed and certified for the 9601, 9602,
9522, 9522A and 9522B) in conjunction with suitable protection circuitry.
4.2 RF Interface Specifications
The RF interface requirements for the Iridium Core 9523/9523N are summarized in Table 16 below.
Table 16: General RF Parameters
Parameter
Value
Frequency Range
1616 MHz to 1626.5 MHz
Duplexing Method
TDD (Time Domain Duplex)
Input/Output Impedance
50Ω
Multiplexing Method
TDMA/FDMA