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

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-17
2. Left-click the desired frequency field (starting with the highest frequency shown).
3. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen 
indicates whether the radio is transmitting.
4. Measure the transmit power of the radio with a service monitor.
5. Adjust the softpot value until the required power, as shown in 
Table 6-4, is indicated on the...

February 3, 20036881076C20-E
6-18Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
6.3.4 Transmit Current Limit Alignment
This procedure is required for mobile radios only. Transmit Current Limit adjustment is required after 
replacing (or servicing) the RF Board.
This alignment procedure limits the transmitter current drain of the radio.
1. Click on the PTT Toggle button to make the radio transmit.
2. While transmitting, measure the current drain at each of the...

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-19
This procedure needs to be performed at multiple frequencies 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.
Proper alignment requires a modulation analyzer or meter with a frequency response to less than 
10Hz modulating frequency. The modulation analyzer settings during this test...

February 3, 20036881076C20-E
6-20Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
Figure 6-16.  Transmit Deviation Balance (Compensation) Alignment Screen
6. Left-click the PTT Tone: Low button.
7. Left-click the PTT Toggle button on the screen to enable transmission. The screen indicates 
whether the radio is transmitting. Wait approximately 5 seconds until the voltage shown on R-
2670, or the deviation shown on the 8901_ analyzer, stabilizes. 
8. Measure and...

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-21
This test can be done with either the R-2670 Communication Analyzer or the 8901_ Series 
Modulation Analyzer. The method of choice is the R-2670 analyzer.
1. Initial set up using the R-2670 Communication Analyzer:
- Connect a BNC cable between the “DEMOD OUT” port and the “VERT/SINAD DIST/DMM 
COUNTER IN” port on the R-2670.
-Press the SPF key on the R-2670 to display the “SPECIAL...

February 3, 20036881076C20-E
6-22Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
5. Left-click the PTT Toggle button on the screen to make the radio transmit. Wait 
approximately 5 seconds until the deviation/voltage displayed on the analyzer stabilizes. The 
screen indicates whether the radio is transmitting.
6. Adjust the deviation limit to within 0.158 to 0.163 Vac on the R-2670 (2.785 to 2.885 kHz). 
The optimum setting is 0.160 Vac (2.83 kHz).
7. Repeat the...

6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-23
Figure 6-18.  Bit Error Rate Test Screen
6.3.8 Transmitter Test Pattern
This screen is used to transmit specific test patterns at a desired frequency so that the user can 
perform tests on the radio’s transmitter and contains the following fields:
 Tx Frequency:
This field selects the Transmit Frequency directly in MHz.
 Channel Spacing:
This field allows the user to select the...

February 3, 20036881076C20-E
Notes
6-24Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 

Chapter 7 Encryption
7.1 Universal Crypto Module Kits
This information applies to both conventional and trunked systems.
The following tables contain the Universal Crypto Module (UCM) kits for the ASTRO Digital Spectra 
and Digital Spectra Plus radios.
7.1.1 ASTRO Digital Spectra
7.1.2 ASTRO Digital Spectra Plus
7.1.3 Secure Dispatch Operation
On personalities or talkgroups that are programmed to be secure-selectable, press and release the 
Secure button to toggle between secure and clear. 
 The secure...

February 3, 20036881076C20-E
7-2Encryption: Load an Encryption Key
 The secure status annunciator not lit (OFF) indicates that the transmitted signal is non-
encrypted.
Whether the current personality is strapped for secure or clear, the secure status annunciator 
correctly displays the transmit operation as being either secure (encrypted) or clear (non-encrypted).
NOTE:You cannot change from secure to clear while the PTT button is pressed. The radio will 
generate an illegal tone and the transmission...