Motorola ASTRO SPECTRA Service Manual

February 3, 2003 6881076C20-E
6-16 Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
6. Left-click the Program (Digital Spectra) or Program All (Digital Spectra Plus) button on the
screen to dekey the radio and save the tuned values.
7. Left-click the Close button on the screen to return to the Transmitter Alignments menu.
6.3.3 Transmit Power Alignment
Transmit Power alignment is required after replacing (or servicing) the transceiver board.
This alignment procedure adjusts the transmit power of the radio and must be performed for two
different power levels, at multiple frequencies for each power level, to allow for proper alignment
across the entire RF band. The RF band is divided into frequency zones with a calibration point
(value) in each zone.
Notes
• The same softpot attenuation value will result in DIFFERENT radio output power levels at
different frequencies.
• All power measurements are to be made at the antenna port.
1. Select the TX Power (High, Mid, or Low) alignment screen. The screen will indicate the
transmit frequencies to be used. See
Figure 6-14.
Figure 6-14. Typical Transmit Power Alignment Screen
Table 6-3. Reference Oscillator Alignment
Band Target
800 MHz ±100 Hz

Motorola ASTRO SPECTRA Specifications

General

Frequency Range	136-174 MHz, 403-470 MHz
Number of Channels	Up to 255
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Modulation	FM
Operating Temperature	-22°F to +140°F (-30°C to +60°C)