Motorola Mt1500 Basic 6881094c09 B Manual

							Performance Checks
13 4a. Press Side Button 1 to stop the displays and put the radio into the Control Top and 
Keypad test mode (display radio). The test mode menu “CH TEST” will be 
displayed. Go to the “Control Top and Keypad Test Mode (Display Radio)” section 
on page 14.
NOTE:Each press of Side Button 1 will toggle between “CH TEST” and
“RF TEST.”
OR
4b. Press the Top Programmable Button to stop the displays and put the radio into the 
RF test mode (display radio). The test mode menu “1 CSQ.” will be displayed, 
indicating test frequency 1
, Carrier SQuelch mode. Go to “RF Test Mode (Display 
Radio)” in the next section.
RF Test Mode 
(Display Radio)When the ASTRO Digital XTS 2500 radio is operating in its normal environment, the radios 
microcomputer controls the RF channel selection, transmitter key-up, and receiver muting, 
according to the customer codeplug configuration. However, when the unit is on the bench for 
testing, alignment, or repair, it must be removed from its normal environment via a special 
routine, called TEST MODE or “air test.”
1. Each additional press of Side Button 3 will advance to the next test channel. (Refer 
to Figure 7.)
2. Pressing Side Button 2 will scroll through and access test environments as shown in 
Figure 8.
NOTE:Transmit into a load when keying a radio under test.
Table 7. Test Frequencies
Frequency700/800 MHz RX700/800 MHz TX
F1 764.0625 764.0125
F2 769.0625 769.0125
F3 775.9375 775.9875
F4 851.0625 794.0125
F5 860.0625 809.0125
F6 869.9375 823.9875
F7 851.0625 851.0125
F8 860.0625 860.0125
F9 869.9375 869.8875 
						

							Performance Checks
14
Control Top and 
Keypad Test 
Mode (Display 
Radio)This test mode is used to verify proper operation of all radio buttons and switches if a failure 
is suspected.
1. Press and hold the Top Programmable Button; all segments on the display will light, 
and the LED on the control top will illuminate a red color.
2. Release the Top Programmable Button; “3/0” appears, indicating that the To p  
Programmable Button is in the open condition.
3. Press the Top Programmable Button again; “3/1” appears, indicating that the To p  
Programmable Button is in the closed condition.
4. Rotate the Mode/Zone Selector Switch; “4/0” through “4/15” appears, indicating 
that the selector switch is in mode/zone position 1 through 16.
5. Rotate the Three-Position Concentric Switch; “65/0” through “65/2” appear.
6. Cycle through the 16-Position Programmable Switch; “67/0,” 
“67/1,” and “67/2” appear.
7. Rotate the Vo l u m e  C o n t r o l; “2/0” through “2/255” appear.
8. Press Side Button 1; “96/1” appears; release, “96/0” appears.
9. Press Side Button 2; “97/1”appears; release, “97/0” appears.
10. Press Side Button 3; “98/1”appears; release, “98/0” appears.
11. Press the PTT Switch; “1/1” appears; release, “1/0” appears.
12. Keypad Checks:
Model III Only—
-Press 0, “48/1” appears; release, “48/0” appears.
-Press 1, “49/1” appears; release, “49/0” appears.
-Press 2, “50/1” appears; release, “50/0” appears.
-Press 3, “51/1” appears; release, “51/0” appears.
-Press 4, “52/1” appears; release, “52/0” appears.
-Press 5, “53/1” appears; release, “53/0” appears.
-Press 6, “54/1” appears; release, “54/0” appears.Table 8. Test Environments
No. of 
BeepsDisplayDescriptionFunction
1 CSQ Carrier SquelchRX: unsquelch if carrier detected
TX: mic audio
3TPLTone 
Private-LineRX: unsquelch if carrier and 
       tone (192.8 Hz) detected
TX: mic audio + tone (192.8 Hz)
11 AST ASTRORX: none
TX: 1200Hz tone **
12 USQ Carrier
UnsquelchRX: unsquelch always
TX: mic audio
 ** All deviation values are based on deviation tuning of this mode. 
						

							Performance Checks
15
-Press 7, “55/1” appears; release, “55/0” appears.
-Press 8, “56/1” appears; release, “56/0” appears.
-Press 9, “57/1” appears; release, “57/0” appears.
-Press *, “58/1” appears; release, “58/0” appears.
-Press #, “59/1” appears; release, “59/0” appears.
All Display Models—
-Press V, “128/1” appears; release, “128/0” appears.
-Press h, “129/1” appears; release, “129/0” appears.
-Press U, “130/1” appears; release, “130/0” appears.
-Press the left-hand D key on the top row of keys, “131/1” appears; release, “131/
0” appears.
-Press the center E key, “132/1” appears; release, “132/0” appears.
-Press the right-hand F key, “133/1” appears; release, “133/0” appears.
-Press 
@ button, “134/1” appears; release, “134/0” appears.
-Press 
X (up arrow), “135/1 appears; release, “135/0” appears.
-Press 
Y (down arrow), “136/1” appears; release, “136/0” appears.
Non-Display 
Radio Test Mode
Entering Non-
Display Radio Test 
Mode1. Turn the radio on.
2. Within 10 seconds after the top green LED turns off, press Side button 3 five times in 
succession.
3a. Press Side Button 1 to put the radio into the Control Top and Keypad test mode (non-
display radio). Go to the “Control Top and Keypad Test Mode (Non-Display Radio)” 
section on page 16.
NOTE:Each press of Side Button 1 will toggle between Control Top and
Keypad test mode (non-display radio) and RF test mode (non-
display radio).
OR
3b. Press the Top Programmable Button to stop the displays and put the radio into the 
RF test mode (non-display radio). Go to “RF Test Mode (Non-Display Radio)” in the 
next section.
RF Test Mode (Non-
Display Radio)When the ASTRO Digital XTS 2500 radio is operating in its normal environment, the radios 
microcomputer controls the RF channel selection, transmitter key-up, and receiver muting 
according to the customer codeplug configuration. However, when the unit is on the bench for 
testing, alignment or repair, it must be removed from its normal environment via a special 
routine, called TEST MODE or “air test.”
1. Each additional press of Side Button 3 will advance to the next test channel. (Refer to 
Table 7 on page 13.) The channel number is represented by the number of beeps  
						

							Performance Checks
16emitted by the radio after the button press (for example, five beeps indicates channel 
5).
2. Pressing Side Button 2 will scroll through and access test environments as shown in 
Table 8 on page 14. The test environment is represented by the number of beeps 
emitted by the radio after the button press (for example, 11 beeps indicate AST). 
NOTE:Transmit into a load when keying a radio under test.
Control Top and 
Keypad Test 
Mode (Non-
Display Radio)This test mode is used to verify proper operation of all radio buttons and switches if a failure 
is suspected.
1. Press and hold the Top Programmable Button; the LED on the control top lights 
red, and the radio beeps.
2. Release the Top Programmable Button; the radio beeps again.
3. Press the Top Programmable Button again; the radio beeps, indicating that the To p  
Programmable Button is in the closed condition.
4. Rotate the Three-Position Concentric Switch; the radio beeps in each switch 
position.
5. Rotate the Mode/Zone Selector Switch; the radio beeps in each switch position.
6. Cycle through the 16-Position Programmable Switch; the radio beeps in each switch 
position.
7. Rotate the Vo l u m e  C o n t r o l; the radio beeps at each new volume setting.
8. Press Side Button 1; the radio beeps.
9. Press Side Button 2; the radio beeps.
10. Press Side Button 3; the radio beeps. 
						

							Performance Checks
17 Table 9. Receiver Performance Checks
Te s t  N a m eSystem AnalyzerRadioTe s t  S e tComments
Reference 
FrequencyMode: PWR MON 4th channel 
test frequency*
Monitor: Frequency error. Input 
at RF In/OutTEST MODE, 4 
CSQ output at 
antennaPTT to continuous (during 
the performance check)Frequency error to be 
≤ ±1.3 kHz
Rated AudioMode: GEN 
Output level: 1.0mV RF 4th 
channel test frequency*
Mod: 1 kHz tone at 3 kHz 
deviation
Monitor: DVM: ac VoltsTEST MODE, 4 
CSQPTT to OFF (center); 
meter selector to Audio PASet volume control to 
3.74Vrms
Distortion As above, except to distortion As above As above Distortion < 3.0%
Sensitivity 
(SINAD)As above, except SINAD; lower 
the RF level for 12dB SINADAs above PTT to OFF (center) RF input to be < 
0.35µ V
Noise Squelch 
Threshold (only 
radios with 
conventional 
system need to be 
tested)RF level set to 1mV RF As above PTT to OFF (center); 
meter selection to Audio 
PA; spkr/load to speakerSet volume control to 
3.74Vrms
As above, except change 
frequency to a conventional 
system. Raise RF level from 
zero until radio unsquelches.Out of TEST 
MODE; select a 
conventional 
systemAs above Unsquelch to occur at 
< 0.25µ V. Preferred 
SINAD = 5-8dB
*See Table 7 on page 13. 
						

							Performance Checks
18Table 10. Transmitter Performance Checks
Te s t  N a m eSystem AnalyzerRadioTe s t  S e tComments
Reference 
FrequencyMode: PWR MON 4th 
channel test frequency*
Monitor: Frequency error. 
Input at RF In/OutTEST MODE, 4 
CSQPTT to continuous 
(during the performance 
check).Frequency error to be ≤ ±1.3 
kHz.
Power RF As above As above, 
4 CSQAs above Refer to Maintenance 
Specifications page in front of 
manual.
Voice 
ModulationMode: PWR MON 4th 
channel test frequency* 
atten to –70, input to RF In/
Out. 
Monitor: DVM, ac Volts. Set 
1 kHz Mod Out level for 
0.025Vrms at test set, 
80mVrms at ac/dc test set 
jackAs above, 
4 CSQAs above, meter 
selector to micDeviation: ≥ 4.1 kHz but ≤ 
5.0 kHz
Voice 
Modulation 
(internal)Mode: PWR MON 4th 
channel test frequency* 
atten to –70, input to RF In/
OutTEST MODE, 4 
CSQ, output at 
antennaRemove modulation 
inputPress PTT switch on radio. 
Say “four” loudly into the 
radio mic. Measure 
deviation: ≥ 4.1 kHz but ≤ 5.0 
kHz
PL Modu-lation 
(radios with 
conven-tional, 
clear mode, 
coded squelch 
oper-ation only)Change frequency to a 
conventional transmit 
frequencyConventional
coded squelch 
personality 
(clear mode 
operation) 4 
TPLAs aboveDeviation: ≥ 500Hz but ≤ 
1000Hz
Talkaround 
Modulation 
(radios with 
conventional, 
clear mode, 
talk-around 
operation only)Change frequency to 
conventional talk-around 
frequency.
 Mode: PWR MON 
deviation, attenuation to –70, 
input to RF In/Out.
 Monitor: DVM, ac volts Set 
1 kHz Mod Out level for 
25mVrms at test set.Conventional 
talkaround 
personality 
(clear mode 
operation) 
1 CSQAs aboveDeviation: ≥ 4.1 kHz but ≤ 
5.0 kHz
*See Table 7 on page 13 
						

							19
Radio Alignment
Procedures
6
Introduction to 
This SectionThis section describes both receiver and transmitter radio alignment procedures.
GeneralA personal computer (PC) and tuner software are required to align the radio. Refer to the 
applicable manual for installation and setup procedures for the software. To perform the 
alignment procedures, the radio must be connected to the PC and to a universal test set as 
shown in  Figure 4. Radio Alignment Test Setup on page 11.
Select Tuner from the START menu. To read the radio, use the File 
➝ Read Device menu 
or click on  . Figure 5 illustrates how the alignment screens are organized. To access a 
screen, double-click on the desired screen name in the Tu n e r menu. These procedures should only be attempted by qualified service 
personnel. Failure to perform alignment procedures properly may result 
in seriously degraded radio or system performance.
Figure 5.  Tuner Menu Layout
!
C a u t i o n
123ABC1234
Radio Information
Transmitter Alignments
Reference Oscillator (page 21)
Tx Power High (page 23)
Tx Power Mid (page 23)
Tx Power Low (page 23)
Tx Deviation Balance (page 25)
Tx Deviation Limit (page 27)
Receiver Alignments
Front End Filter (page 28)
Performance Testing
Bit Error Rate (page 29)
Transmitter Test Pattern (page 31) 
						

							Radio Alignment Procedures
20The alignment screens introduce the concept of the “softpot,” an analog SOFTware-
controlled POTentiometer used for adjusting all transceiver alignment controls.
Each alignment screen provides the ability to increase or decrease the softpot value by 
using a slider or the screen’s UP/DOWN arrow keys (  ), or by entering the new value 
from the keyboard. A graphical scale on the display indicates the minimum, maximum, and 
proposed value of the softpot; see Figure 6.
Adjusting the softpot value sends information to the radio to increase (or decrease) a 
voltage in the corresponding circuit. For example, left-clicking the UP arrow  on the 
Reference Oscillator screen instructs the radio’s microcomputer to increase the voltage 
across a varactor in the reference oscillator, which increases the frequency.
In ALL cases, the softpot value is just a relative number corresponding to a digital-to-
analog (D/A) generated voltage in the radio.
Perform the following procedures in the sequence indicated.
NOTE:Some of the following screens may vary depending upon the radio under 
test and the version of tuner software you are using. Refer to the 
software’s on-line help.Do NOT switch radios in the middle of any Alignment procedure. 
Always left-click the Close button on the screen to return to the MAIN 
menu screen before disconnecting the radio. Improper exits from the 
Alignment screens may leave the radio in an improperly configured 
state and result in seriously degraded radio or system performance.
Figure 6.  Typical Softpot Screen
!
C a u t i o n 
						

							Radio Alignment Procedures
21
Radio InformationFigure 7 shows a typical Radio Information screen.
Reference 
Oscillator 
AlignmentAdjustment of the reference oscillator is critical for proper radio operation. Improper 
adjustment will result not only in poor operation, but also in a misaligned radio that will 
interfere with other users operating on adjacent channels. For this reason, the reference 
oscillator should be checked every time the radio is serviced, or once a year, whichever 
comes first. The frequency counter used for this procedure must have a stability of 0.1 ppm 
(or better).
NOTE:Reference oscillator alignment is required after replacing (or servicing) 
the transceiver board.
This test can be done with either the R-2670 Communication Analyzer or the 
8901_Modulation Analyzer.
 Initial setup using the R-2670 Communication Analyzer:
-RF Control: MONITOR
-B/W: WB
-Freq: CPS frequency under test
-Attenuation: 20dB
-Mon RF in: RF I/O
-Meter: RF Display
-Mode: STD
-Input Level: uV or W
-Display: Bar Graphs
-Squelch: Mid-range or adjust as necessary
Initial setup using the 8901_ Series Modulation Analyzer:Figure 7.  Radio Information Screen 
						

							Radio Alignment Procedures
22-Press the green Automatic Operation button on the analyzer. 
-Press the FREQ key.
-Ty p e 7.1 followed by SPCL button to set the 8901B_ modulation analyzer for 
maximum accuracy.
To align the reference oscillator:
1. Select the Reference Oscillator alignment screen. See Figure 8.
2. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen 
indicates whether the radio is transmitting.
3. Measure the transmit RF frequency with your service monitor.
4. Adjust the reference oscillator’s softpot value until the measured value is as close as 
possible to the frequency shown on the screen. See Table 11.
5. Left-click the Program All button on the screen to dekey the radio and save the tuned 
values.
6. Left-click the Close button on the screen to return to the Transmitter Alignments 
menu.Figure 8.  Reference Oscillator Alignment Screen
Table 11.  Reference Oscillator Alignment
BandTarget
VHF ±100 Hz
UHF R1 (380-470 MHz) ±100 Hz
700 MHz/800 MHz ±100 Hz