AL3A-RM Quick Start Guide Version A
Document Number: 451-93156-014A
14 of 18
Both of these models can be purchased separately from NAL Research. The HRC-24-7R
cable consists of a full DB-9 serial connector and two terminal leads for DC power input.
The HRC-24-8R data kit consists of a full DB-9 serial connector/cable, an RJ-45 for the
DPL audio handset, and a DC power plug. A three-wire (TX, RX, and GND) serial cable can
also be used (see document 451-93156-002B [1]) if flow control is not required. The
A3LA-RM automatically adjusts to the DTE baud.
7.
Connect an external Iridium antenna to the A3LA-RM.
Any of the four types of antennas offered by NAL Research is appropriate (SYN7391
Series, SAF2040 Series, SAF5340 Series, and SAF5350 Series).
8.
Ensure the antenna has a full view of the sky and the cable loss between the modem
and antenna is less than 3 dB.
Figure 8: Iridium Antenna Connector
9.
Supply DC power (can be at any voltage between 4.0 V–5.4 V or 5.0 V–32 V) to the
power input of the HRC-24-7R or of the HRC-24-8R data kit. The A3LA-RM is configured
to accept 5.0 V–32.0 V as factory-setting default. To operate at voltages below 5 V, the
device must be reconfigured with an internal jumper (see document: 451-93156-002B
A3LA-RM User Guide Rev A), section 2.3 [1]). The modem will automatically be ON/OFF
when DC power is applied/removed if the EXT_ON_OFF pin is left unconnected (pin 1).
If power to the modem is cycled, ensure the elapsed time between each power cycle is
at least 2 seconds. NAL Research’s AC adapter model LA-3098 (purchase separately)
can be used to power the A3LA-RM.
Iridium Antenna
Connector
WARNING:
To comply with FCC RF exposure requirements, a minimum separation
of 20 cm is required between the antenna and all persons.
