Chapter 2 Radio Power
This chapter provides a detailed circuit description of the power distribution of an ASTRO APX 2000/
APX 4000/ APX 4000Li/ APX 1000 (900 MHz) radio.
2.1 General
In the ASTRO APX 2000/ APX 4000/ APX 4000Li/ APX 1000 (900 MHz) radio, power (B+) is
distributed to two boards: the main board and the keypad board (see Figure 2-1 on page 2-2).
Power for the radio is provided through a battery supplying a nominal 7.5 Vdc directly to the
transceiver. The following battery types and capacities are available:
Table 2-1. IMPRES Batteries
Part Number Description
NNTN8128_ APX 2000 IMPRES Li Ion Battery Slim (1900 mAH)
NNTN8129_ APX 2000 IMPRES Li Ion High Cap Battery (FM, 2300 mAH)
PMNN4424_ APX 2000 IMPRES Li Ion High Cap Battery (2300 mAH)
NNTN8560_* APX 2000 IMPRES Li Ion High Cap Battery (TIA4950, 2500 mAH)
Note:
* = Applicable to APX 2000/ APX 4000 (Two Knobs) only.
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