Motorola Radio Mcs2000 Vol 1 68p81083c20 A Manual

Disassembly & Reassembly and Replacement Procedures 5-25
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5-26 Disassembly & Reassembly and Replacement Procedures
NOTES 

 
Radio Tuning Procedure 6-1 
Radio Tuning  Procedure 
6 
General 
An IBM PC (personal computer) and RSS (Radio Service Software) are required 
to align the radio. Refer to the applicable RSS Manual for installation, setup 
procedures for the software and minimum computer requirements.
To perform the alignment procedures, the radio must be connected to the PC, 
RIB (Radio Interface Box), and Test Set as shown in Figure 6-1.  
The use of Mini UHF Adapters will have damaging effects on the RF 
Antenna...

 
6-2Radio Tuning Procedure  
As listed in the Service Aids table in Chapter 3 two different RSS packages are 
available for Þeld programming of the MCS 2000 radios:
¥  
RVN4113  
 for SmartNet/Zone, STARTSITE and Conventional StatAlert 
operation 
¥  
GVN6011  
 for Conventional Select 5 operation.  
In RVN4113  
 all service and tuning procedures are performed from the 
SERVICE menu, which is selected by pressing   
F2  
 from the MAIN MENU. Figure 
6-2 illustrates how the MCS 2000 RSS SERVICE screens...

 
Radio Tuning Procedure6-3  
graphical scale is displayed indicating the minimum, maximum, and 
proposed value of the softpot, as shown in Figure 6-3.
Adjusting the softpot value sends information to the radio to increase (or 
decrease) a DC voltage in the corresponding circuit. For example, pressing the 
UP arrow key at the Reference Oscillator screen instructs the radio 
microprocessor to decrease the voltage across a varactor in the reference 
oscillator, which decreases the frequency.  
Figure 6-3...

 
6-4Radio Tuning Procedure 
Transmitter Power 
The radio requires two power level adjustments, a high power or rated power 
adjustment, and a low power adjustment.
¥After POWER tuning, measure and note the DC current to the radio on 
each channel in the high power level. These values are needed for the 
Current Limit tuning.
¥The larger the softpot values, the lower the transmit power.
1.From the SERVICE menu, press F2 to select TRANSMITTER alignment.
2.Press F9 to select CURRENT LIMIT. Use the UP/DOWN...

 
Radio Tuning Procedure6-5  
4.Press F6 to key the radio, and use the UP/DOWN arrow keys to adjust the 
transmit power per the value shown in Table 6-2.
5.Press F6 to dekey the radio, and then press F8 to program the value. Press 
ENTER to select next softpot frequency.
6.Repeat steps 4 and 5 for the remaining test frequencies.
7.Press F10 to return to the TRANSMIT menu. 
Transmit Current 
Limit 
After POWER tuning, measure and note the DC current to the 
radio on each channel in the high power level....

 
6-6Radio Tuning Procedure 
2.Begin with the lowest test frequency shown on the screen.
3.W
ith Test Box RLN4460A: Set the test box METER OUT switch to the 
AUDIO IN position, and inject a 80 Hz tone at 100 mVrms into the 
AUDIO IN BNC connector. To ensure proper signal level measure on 
METER OUT jack with AC voltmeter.
W
ith Test Box GTF180B: Set the Test Box meter selector switch to the 
ÒGENÓ position, and inject a 80 Hz tone at 100 mVrms into the ÒAudio 
InÓ port. Connect an AC meter to the meter...

 
Radio Tuning Procedure6-7 
Transmit 
Deviation Limit 
Reference  
This procedure is only required for VHF and UHF models with 
20 kHz and 12.5 kHz channel spacing.
These softpots set the deviation reduction ratio to transmit at 20 kHz or 12.5 
kHz channel spacing.
1.Press F6 to select the TRANSMIT DEVIATION LIMIT 12.5/20 kHz softpot.
2.W
ith Test Box RLN4460A: With the meter selector switch set to MIC, 
inject a 1 kHz tone on the AUDIO IN terminal on the test set, 400 
mVrms as measured on the AC/DC...

 
6-8Radio Tuning Procedure 
6.Press F6 again to dekey the radio.
7.Press F8 to program the softpot value; press F10 twice to return to the 
SERVICE menu. 
High Speed 
Deviation 
1.From the SERVICE menu, press F4 to select SIGNALING alignment
2.Press F3 to select the TRUNKING HIGH SPEED softpot.
3.Press F6 to key the radio on the test frequency. The screen will indicate 
that the radio is transmitting.
4.Measure the TRUNKING HIGH SPEED deviation on your service 
monitor.
5.Use the UP/DOWN arrow keys to...