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Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual
Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual
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6881076C20-EFebruary 3, 2003 Radio Alignment Procedure: RSS6-7 8. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to return to the SERVICE MENU. 6.2.6 Transmit Deviation Balance (Compensation) Alignment NOTE:Compensation alignment is only required after replacing (or servicing) the command board, VOCON (vocoder/controller) board, RF board, or the VCO board. Compensation alignment balances the modulation sensitivity of the VCO and reference modulation (synthesizer low-frequency port) lines. The compensation algorithm is critical to the operation of signaling schemes that have very-low-frequency components (for example, DPL) and could result in distorted waveforms if improperly adjusted. Compensation values are adjusted at the different test frequencies to achieve a flat VCO modulation sensitivity with respect to the RF frequency and with respect to the low frequency response of the synthesizer. This test can be done with either the R-2670 Communication Analyzer or the 8901_ Series Modulation Analyzer. The R-2670 analyzer is recommended. 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 FUNCTIONS MENU.” Move the cursor to “High Pass,”and select 5 Hz via the soft key menu. Select 20 kHz for the “Low Pass” setting. - In the “RF Control” section of the R-2670, enter the frequency displayed on the RSS screen (choose a test frequency from the list of frequencies displayed under Transmit Deviation Balance [Compensation] in RSS). Move the cursor to the “B/W” setting and select “WIDE +/- 100 kHz” via the soft key menu. - Place the R-2670 cursor in the “Display” zone. Select “AC VOLTS” on the soft key menu. Move the cursor to the “Range” setting and select “AUTO.” 2. Initial set up using the 8901_ Series Modulation Analyzer: - Press the FM MEASUREMENT button. (The “Error 03-input level too low” indication is normal until an input signal is applied.) - Simultaneously press the Peak – and Peak + buttons. Both LEDs on the buttons should light. - Press the 15 kHz LP filter button. 3. From the SERVICE MENU, press F2 to select the TRANSMITTER ALIGNMENT MENU. 4. Press F5 to select the TRANSMIT DEVIATION BALANCE (COMPENSATION) alignment screen ( Figure 6-7).
February 3, 20036881076C20-E
6-8Radio Alignment Procedure: RSS
Figure 6-7. Transmit Deviation Balance (Compensation) Alignment Screen
5. Press Ta b to select and start the alignment at the lowest frequency listed.
6. Press F3 (TOGGLE LOW TONE PTT) to key the radio. Wait approximately five seconds until
the frequency displayed on the analyzer stabilizes.
7. Measure and record the deviation value from the 8901_ analyzer or the ac voltage value from
the R-2670 analyzer.
8. Press F3 to dekey the radio.
9. Press F6 (TOGGLE HIGH TONE PTT) to key the radio. Wait approximately 5 seconds until
the voltage shown on R-2670 analyzer, or the deviation shown on the 8901_ analyzer,
stabilizes.
10. Use the Up and Down arrow keys on the computer keyboard to adjust the deviation to within
±1.5%) of the value recorded in step 6.
11 . P r e s s F6 to dekey the radio, and then press F6 again to verify the deviation setting.
12. Press F8 to program the new softpot value.
13. Repeat steps 4 through 10 to ensure the correct deviation balance value has been saved.
14. Repeat steps 4 through 11 for each of the remaining frequencies.
15. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to
return to the SERVICE MENU.
6.2.7 Transmit Deviation Limit Alignment
This test can be done with either the R-2670 communication analyzer or the 8901_ Series
Modulation Analyzer. The R-2670 is recommended.
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 of the R-2670.
- Press the SPF key on the R-2670 to display the “SPECIAL FUNCTIONS MENU.”Move the
cursor to “High Pass,”and select 5 Hz via the soft key menu. Select 20 kHz for the “Low
Pass” setting.
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
ASTRO Model: T04SLF9PW7AN
MAIN:SERVICE:TX ALIGN:BAL ATTN
TRANSMIT DEVIATION BALANCE (COMPENSATION)
-----------------------------------------
Current
Frequency Value New Softpot Value
--------- ------- -----------------
806.0125 30 30
821.0125 30 30
851.0125 30 30
866.0125 45 45
869.9875 45 45
Transmitter..Off
0 63
MIN |----+----+----+----X----+----+---+----+----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE LOW TOGGLE HIGH PROGRAM EXIT
TONE PTT TONE PTT VALUE
6881076C20-EFebruary 3, 2003
Radio Alignment Procedure: RSS6-9
- In the “RF Control” section of the R-2670, enter the frequency displayed on the RSS screen
(choose a test frequency from the list of frequencies displayed under TRANSMIT
DEVIATION LIMIT screen in RSS). Move the cursor to the “B/W” setting and select “WIDE
+/- 100 kHz” via the soft key menu.
- Place the R-2670 cursor in the “Display” zone. Move the cursor to the “Meter” setting and
select “AC VOLTS” via the soft key menu. Move the cursor to the “Range” setting and
select “AUTO.”
2. Initial set up using the 8901_ Series Modulation Analyzer:
- Press the FM MEASUREMENT button. (The “Error 03-input level too low” indication is
normal until an input signal is applied.)
- Simultaneously press the Peak – and Peak + buttons. Both LEDs on the buttons should
light.
- Press the 15 kHz LP filter button.
3. From the SERVICE MENU, press F2 to select the TRANSMITTER ALIGNMENT MENU.
4. Press F6 to select the TRANSMIT DEVIATION LIMIT alignment screen (
Figure 6-8).
Figure 6-8. Transmit Deviation Limit Alignment Screen
5. Press Ta b to select and start the alignment at the lowest frequency listed.
6. Press F6 and observe the measurement.
7. Wait approximately 5 seconds until the voltage shown on the R-2670 analyzer, or the
deviation shown on the 8901_ analyzer, stabilizes.
8. Adjust the deviation limit to within 0.158 to 0.163 Vac on the R-2670 analyzer, or 2.785 to
2.885 kHz on the 8901_ analyzer. The optimum setting is 0.160 Vac (2.83 kHz).
9. Press F6 again to dekey the radio.
10. Press F8 to program the new softpot value.
11. Repeat steps 4 through 7 to ensure the correct deviation limit is saved.
12. Repeat steps 3 through 7 for each of the remaining frequencies.
13. If the transmit limit adjustment required was excessive, repeat or recheck the transmit
deviation balance (compensation) procedure on page 6-7.
14. Press F10 once to return to the TRANSMITTER ALIGNMENT MENU, or press F10 twice to
return to the SERVICE MENU.
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
ASTRO Mobile Model: T04SLF9PW7AN
MAIN:SERVICE:TX ALIGN:DEVIATION
TRANSMIT DEVIATION LIMIT
------------------------
Current
Frequency Value New Softpot Value
--------- --------- ------------------
813.4750 11750 11750
822.4750 11750 11750
858.4750 11800 11800
867.9750 11800 11800
Transmitter..Off
0 32767
MIN |----+----+----+----X----+----+----+----+----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE PROGRAM EXIT
PTT VALUE
February 3, 20036881076C20-E 6-10Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6.2.8 Bit Error Rate (BER) Performance Check This check tests the Bit Error Rate (BER) of the radio’s receiver at a desired frequency. Required equipment and software: R-2670 system analyzer, with P25 option; IBM PC-compatible computer, RSS In Generate mode, the R-2670 system analyzer modulates the RF carrier with a 1011Hz tone test pattern to test the Unit Under Test (UUT) receiver. The test pattern received by the UUT is compared in the UUT with a stored version of the test pattern to compute a BER. 1. Connect the RF Input port of the UUT to the RF IN/OUT port of the analyzer. 2. Set up the R-2670 as follows: - Place the cursor in the RF Zone, and configure the analyzer as follows: RF control: Generate Preset: B/W: NB Freq: Desired test frequency; for example, 851.0625MHz Output Level: -50.0 dBm Gen RF Out: RF I/O - Place the cursor on the Mode field in the Display Zone. - Select PROJECT 25 STD. - Set the METER field to RF DISPLAY. - Place the cursor on the CODE field in the Audio Zone. - Select the 1011 Hz PAT softkey. This generates a 1011Hz tone test pattern. If this pattern is received correctly by the UUT, the measured BER should be zero. - Set the deviation in the Audio Zone as PROJ25Dev: 2.83 kHz ~. 3. Using the RSS, configure the UUT as follows: - In the RSS Main Menu, press F2 to select SERVICE: Alignment. -Press F5 to select Performance Testing. -Press F2 to select Bit Error Rate. - Enter the desired test frequency in the Rx Frequency (MHz) field; for example, 851.0625MHz. - Set the Modulation Type to 12.5 kHz/C4FM. - Set the BER Integration Time (sec) to not less than 7.200. -Press F6 (Start/Stop) to begin the test. 4. Monitor the radio’s received BER (%) results on the computer. 5. Reduce the analyzer output level to achieve a standard Bit Error Rate of 5%. The analyzer RF output level should be within the SINAD specification of the UUT. 6.3 ASTRO Digital Spectra and Digital Spectra Plus Tuner Software A personal computer (PC) and Tuner Software are required to align the radio. Please refer to the CPS Programming Installation Guide (Motorola part number 6881095C44) for installation and setup procedures for the software. To perform the alignment procedures, the radio must be connected to the computer and to a universal test set, as shown in the following figure.
6881076C20-EFebruary 3, 2003 Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-11 Figure 6-9. ASTRO Digital Spectra Plus Radio Alignment Test Setup Select Tuner from the START menu. To read the radio, use the File ➝ Read Device menu or click on . Figure 6-10 illustrates how the alignment screens are organized. To access a screen, double-click on the desired screen name in the Tuner 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. RX 30-85001D01TX GNDCOMMUNICATIONS ANALYZER WATTMETER RADIO MATCHING TRANSFORMER CONTROL HEAD TEST SPEAKER RF PORT For dash mount applications, ASTRO Spectra Plus program/flash cable (30-85001D01) will be connected to the microphone port on the control head. For remote mount the 30-85001D01 will be connected to the flashport connector on the front face of the radio (P506). Do not attempt to use a microphone while cable is connected. ** COMPUTER SINAD METER AC VOLTMETER RX COMMUNICATIONS ANALYZER Vert/SINAD Dist/ DVM Counter OR AGILENT 8901B MODULATION ANALYZER RF ATTENUATOR MAEPF-27246-O ! C a u t i o n
February 3, 20036881076C20-E 6-12Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software Figure 6-10. Tuner Menu Layout The 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 the slider or the screen’s spin buttons ( ▲ and ▼), 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 6-11.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. ! C a u t i o n
6881076C20-EFebruary 3, 2003 Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-13 Figure 6-11. Typical Softpot Adjustment Screen 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 spin button ( ▲) 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. Digital Spectra only: Each Digital Spectra tuning screen contains a Program button. Pressing the Program button sets only the softpot value associated with the currently selected frequency, so it is necessary to press the Program button after tuning each softpot at each and every frequency. Digital Spectra Plus only: Each Digital Spectra tuning screen contains a Program All button. Pressing the Program All button sets all softpot values shown on the screen at the same time, which makes it possible to first adjust all the softpot values and then press the Program All button to set the values before leaving a screen. Pressing the Program All button more than once has no adverse effect on the new values. Perform the following procedures in the sequence indicated. NOTE:Some of the following screens may vary depending on the radio under test and the version of tuner software you are using. Refer to the software’s on-line help.
February 3, 20036881076C20-E 6-14Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6.3.1 Radio Information Figure 6-12 shows a typical Radio Information screen. All of the data appearing here is informational and cannot be changed.. Figure 6-12. Radio Information Screen 6.3.2 Reference Oscillator Alignment Reference oscillator alignment is required after replacing (or servicing) the transceiver board. 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 requirements 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 field. It is strongly recommended that the reference oscillator be checked every time the radio is serviced or at least once a year, whichever comes first. The crystal contained in the reference oscillator naturally drifts over time due to its aging characteristic. Periodic (annual) adjustment of the reference oscillator is important for proper radio operation. Improper adjustment can result in both poor performance and interference with other users operating on adjacent channels. This test can be done with either the R-2670 Communication Analyzer or the 8901_ Modulation Analyzer. Initial set up using the R-2670 Communication Analyzer: - RF Control: MONITOR - B/W: WB - Freq: RSS frequency under test
6881076C20-EFebruary 3, 2003 Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software 6-15 - 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 set up using the 8901_ Series Modulation Analyzer: - Press the green Automatic Operation button on the analyzer. - Press the FREQ key. - Type 7.1 followed by SPCL button to set the 8901_ modulation analyzer for maximum accuracy. 1. Select the Reference Oscillator alignment screen. See Figure 6-13. Figure 6-13. Reference Oscillator Alignment Screen 2. If you are using the R-2670 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. 3. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen indicates whether the radio is transmitting. 4. Wait five seconds until the analyzer reading stabilizes, and then record the transmitter frequency. 5. Adjust the reference oscillator’s softpot value until the measured value is as close as possible to the frequency shown on the screen. Allow approximately five seconds for the analyzer frequency reading to stabilize after each change. See Table 6-1 on page 6-4 and Table 6-3 on page 6-16 .
February 3, 20036881076C20-E 6-16Radio 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 BandTa r g e t 800 MHz ±100 Hz