Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual

6881076C20-EFebruary 3, 2003
Performance Checks: Test Mode5-5
When in the transmit test mode, DTMF modulation produces a sidetone in the speaker. All signaling 
types will continually modulate the transmitted signal for detection/measurement by external 
instruments.
5.3.3 Control Head Test Mode
The control head test mode is part of the diagnostics built into the radio and is entered through the 
front panel programming sequence. This test mode allows you to perform button and display tests to 
verify...

February 3, 20036881076C20-E
5-6Performance Checks: Receiver Performance Checks
Figure 5-4.  Pushbutton Control Head Key-Closure Displays (W5 and W7)
Figure 5-5.  Pushbutton Control Head Key-Closure Displays (W9)
4. Switch the radio power off temporarily to exit the test mode and return to normal radio 
operation.
5.4 Receiver Performance Checks
Table 5-4.  Receiver Performance Checks
Te s t  N a m eSystem AnalyzerRadioTest ConditionComments
Reference 
FrequencyMode: PWR MON
1st channel test frequency*...

6881076C20-EFebruary 3, 2003
Performance Checks: Transmitter Performance Checks 5-7
5.5 Transmitter Performance Checks
Sensitivity
(SINAD)As above, except SINAD, lower 
the RF level for 12 dB SINADTEST MODE,
1 CSQRelease PTT 
switch.RF input to be
< 0.35µV
Noise Squelch 
Threshold
(only radios with 
conventional 
system need to 
be tested)RF level set to 1 mV RF TEST MODE,
1 CSQRelease PTT 
switch.Set volume control to 
3.16 Vrms across the 
speaker
As above, except change 
frequency to a conventional...

February 3, 20036881076C20-E
5-8Performance Checks: Transmitter Performance Checks
PL Modulation 
(radios with 
conventional, clear 
mode, coded 
squelch operation 
only)Change frequency to 1st channel 
test frequency**;
B/W to narrowTEST MODE,
1 TPLRemove 
modulation input 
from dummy 
microphone.
Press and hold 
PTT switch.Deviation:
VHF, UHF, and 800 
MHz:
>= 500 Hz but = 3.8 kHz but = 3.6 kHz but 

Chapter 6 Radio Alignment Procedure
6.1 Introduction
This section describes both receiver and transmitter radio alignment procedures using either of the 
following radio alignment software:
 ASTRO Digital Spectra Radio Service Software (DOS-based)
 ASTRO Digital Spectra and Digital Spectra Plus Tuner software (Windows-based)
6.2 RSS
6.2.1 ASTRO Digital Spectra
An IBM or IBM PC-compatible computer and radio service software (RSS) are required to align the 
ASTRO Digital Spectra radio. Refer to the...

February 3, 20036881076C20-E
6-2Radio Alignment Procedure: RSS
Figure 6-2.  RSS Service Menu Layout
All SERVICE screens read and program the radio codeplug directly; you do NOT have to use the 
RSS GET/SAVE functions to use the SERVICE menus.
6.2.2 Softpot
The SERVICE screens introduce the concept of the softpot, an analog SOFTware-controlled 
POTentiometer used for adjusting all transceiver alignment controls.
Each SERVICE screen provides the capability to increase or decrease the softpot value with the...

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: RSS6-3
6.2.3 Reference Oscillator Alignment
Radios are shipped from the factory with a worst-case frequency error of ±200 Hz for VHF, ±300 Hz 
for UHF, and ±500 Hz for 800 MHz. These specifications are tighter than the more stringent FCC 
requirement of 1.5 ppm for all bands.
For radios that have been in storage for over six months from the factory ship date, the reference 
oscillator should be checked when the radio is initially deployed to the...

February 3, 20036881076C20-E
6-4Radio Alignment Procedure: RSS
Figure 6-4.  Reference Oscillator Alignment Screen
6. If you are using the R-2670 Communication Analyzer, enter the frequency displayed on the 
RSS screen in the “RF control” section of the R-2670. Under the “Meter” section of the 
display, choose RF DISPLAY.
7. Press F6 to key the radio. The screen will indicate that the radio is transmitting.
8. Wait 5 seconds until the analyzer reading settles. Record the transmitter frequency (or note...

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: RSS6-5
NOTE:The power amplifier must be firmly mounted to the transceiver for accurate power adjustment.
1. From the SERVICE MENU, press F2 to select the TRANSMITTER ALIGNMENT MENU.
2. Press F3 to select the TRANSMIT POWER alignment screen. The screen will indicate the 
transmit frequencies to be used (
Figure 6-5).
Figure 6-5.  Transmit Power Alignment Screen
3. Press Ta b (or Enter or Return) to select a frequency field (starting with the highest...

February 3, 20036881076C20-E
6-6Radio Alignment Procedure: RSS
6. Press F6 to dekey the radio.
7. Press F8 to program the value.
8. Repeat steps 3-7 for the remaining frequencies.
9. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to 
return to the SERVICE MENU.
6.2.5 Transmit Current Limit Alignment
1. From the SERVICE MENU, press F2 to select the TRANSMITTER ALIGNMENT MENU.
2. Press F4 to select the TRANSMIT CURRENT LIMIT alignment screen. The screen will 
indicate the...