Service and Repair Notes S-0044 - Revision history

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SERVICE AND REPAIR NOTES
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<p>SERVICE AND REPAIR NOTES<br>
</font><font FACE="Impact" SIZE="7">Bulletin </font><font FACE="Arial" SIZE="2"><br>
TECHNICAL INFORMATION<br>
COMMERCIAL, GOVERNMENT & INDUSTRIAL SOLUTIONS SECTOR<br>
1301 E. ALGONQUIN RD.<br>
SCHAUMBURG, IL. 60196<br>
1-800-221-7144  </font><b><font FACE="Arial" SIZE="2"><br>
</font></b></p>
<p><b><font FACE="Arial" SIZE="2">SRN # S-0044<br>
APC # 509</p>
<p>DATE: JULY, 2001<br>
EXPIRES: NA</p>
<p>SUBJECT: </font></b><font FACE="Arial" SIZE="2">Enhanced Quantar/Quantro Base
Station Transmit Deviation Procedure for ASTRO Simulcast Systems.</p>
</font><b><font FACE="Arial" SIZE="2">
<p>SYSTEMS AFFECTED: </font></b><font FACE="Arial" SIZE="2">Conventional and
SmartZone ASTRO Simulcast Systems</p>
</font><b><font FACE="Arial" SIZE="2">
<p>MODEL/OPTION AFFECTED: </font></b><font FACE="Arial" SIZE="2">T5365A Quantar/Quantro
Base Station</p>
</font><b><font FACE="Arial" SIZE="2">
<p>Symptom: </font></b><font FACE="Arial" SIZE="2">Subscribers may experience
missed receive audio when the ASTRO Simulcast System outbound Base</font> <font FACE="Arial" SIZE="2">Station
transmit deviation has not been properly optimized. The enhanced procedure
primarily affects optimizations</font> <font FACE="Arial" SIZE="2">performed
with the Motorola R2670 service monitor.</p>
</font><b><font FACE="Arial" SIZE="2">
<p>RESOLUTION: </font></b><font FACE="Arial" SIZE="2">The enhanced guidelines
for measuring deviation, will replace the current station coarse deviation set</font>
<font FACE="Arial" SIZE="2">section in the digital ASTRO system outbound
optimization section of chapter 7 of the GPS Simulcast Installation Manual</font>
<font FACE="Arial" SIZE="2">68-91098E65C and earlier versions, and RSS manual
68-81085E35 chapter 6 "Performing Post-Repair Alignment".</p>
<p>The ASTRO simulcast system deviation for "Wide Pulse" is 3.00 kHz
ï¿½5% and for "Narrow Pulse" it is 2.83 kHz ï¿½5% as</font> <font FACE="Arial" SIZE="2">measured
using the standard deviation test pattern (utilized in the "ASTRO TX Align
and Test" mode of the station). This</font> <font FACE="Arial" SIZE="2">is
not the same as the over-the-air ASTRO signal.</p>
</font><b><font FACE="Arial" SIZE="4">
<p>Note: </font><font FACE="Arial" SIZE="2">There is no reason to align TX
deviation in the field unless the exciter or station control board has been</font></b>
<font FACE="Arial" SIZE="2"><b>changed. TX deviation is aligned in the factory
to an accuracy of 1%.</p>
<p>Pre-Alignment Checklist:</p>
</b></font>
<ul>
<li><font FACE="Arial" SIZE="2">You must set the deviation utilizing the
service mode of the RSS. Setting deviation using off-the-air signals may</font>
<font FACE="Arial" SIZE="2">cause inaccurate system deviation which may
result in missed subscriber receive audio.</li>
</font>
<li><font FACE="Arial" SIZE="2">A strong signal is required to get an accurate
deviation measurement. It is recommended that you have a minimum of</font> <font FACE="Arial" SIZE="2">-10
dBm signal strength input to your Communications System Analyzer.</li>
</font>
<li><font FACE="Arial" SIZE="2">The Narrow Bandwidth-NB filter should be
enabled on the R2670. This is done to reduce the amount of noise inherent</font>
<font FACE="Arial" SIZE="2">to the wider IF of the R2670. Previous versions
of Motorola service monitors did not require setting the bandwidth to</font>
<font FACE="Arial" SIZE="2">narrow.</font></li>
<li><font FACE="Arial" SIZE="2">The High Pass filter should be set to 5 Hz and
the Low Pass filter set to 20 kHz in the R2670ï¿½s "Special Function</font>
<font FACE="Arial" SIZE="2">Menu" post filtering section.</li>
</font>
<li><font FACE="Arial" SIZE="2">The R2670 firmware version should be 5.04.xxx
or newer. The newer version includes a new function which provides</font> <font FACE="Arial" SIZE="2">"Deviation
Smoothing" in bar graph mode with the "expand" command
enabled. This will allow a more accurate</font> <font FACE="Arial" SIZE="2">reading
of deviation. (<a href="#Information on R2670 service monitor:">See Service
Information Bulletin</a> )</li>
</font>
<li><font FACE="Arial" SIZE="2">All channels on the system need to be measured
with the same R2670 service monitor to ensure accurate deviation in</font> <font FACE="Arial" SIZE="2">overlap
areas. If multiple R2670s will be used, measure the difference between all
pieces of test equipment and apply</font> <font FACE="Arial" SIZE="2">the
appropriate correction factor to your measurements.</font></li>
</ul>
<b><font FACE="Arial" SIZE="2">
<p>Interpreting Test Equipment Results</p>
</font></b><font FACE="Arial" SIZE="2">
<p>Based upon system deviation tolerance and service monitor accuracy the chart
depicts what error can be allowed with the</font> <font FACE="Arial" SIZE="2">deviation
measuring equipment. The chart lists the allowable tolerance necessary to
achieve the 3.00 kHz ï¿½ 5 %</font> <font FACE="Arial" SIZE="2">specification,
using various communication analyzers.</font></p>
<table border="0" width="100%">
<tr>
<td width="25%" align="center"></td>
<td width="10%" align="center" valign="middle"><font FACE="Arial" SIZE="2">Lower
Limit </font></td>
<td width="15%" align="center" valign="middle"><font FACE="Arial" SIZE="2">Lower
Reading<br>
Measurement </font></td>
<td width="14%" align="center" valign="middle"><font FACE="Arial" SIZE="2">Specification</font></td>
<td width="16%" align="center" valign="middle"><font FACE="Arial" SIZE="2"> Upper
Reading<br>
 Measurement</font></td>
<td width="21%" align="center" valign="middle"><font FACE="Arial" SIZE="2"> Upper
Limit</font></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">System Tolerance ï¿½ 5 %</font></td>
<td width="10%" align="center"><font FACE="Arial" SIZE="2"> 2850 Hz </font></td>
<td width="15%" align="center"></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="16%" align="center"></td>
<td width="21%" align="center"><font FACE="Arial" SIZE="2"> 3150 Hz</font></td>
</tr>
<tr>
<td width="25%"></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"></td>
<td width="14%" align="center"></td>
<td width="16%" align="center"></td>
<td width="21%" align="center"></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">1 % Instrument Accuracy</font></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"><font FACE="Arial" SIZE="2">2880 Hz</font></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="16%" align="center"><font FACE="Arial" SIZE="2">3120 Hz</font></td>
<td width="21%" align="center"></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">2 % Instrument Accuracy</font></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"><font FACE="Arial" SIZE="2">2910 Hz</font></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2"> 3000 Hz</font></td>
<td width="16%" align="center"><font FACE="Arial" SIZE="2">3090 Hz</font></td>
<td width="21%" align="center"></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">3 % Instrument Accuracy </font></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"><font FACE="Arial" SIZE="2">2940 Hz</font></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="16%" align="center"><font FACE="Arial" SIZE="2">3060 Hz</font></td>
<td width="21%" align="center"></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">4 % Instrument Accuracy</font></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"><font FACE="Arial" SIZE="2">2970 Hz</font></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="16%" align="center"><font FACE="Arial" SIZE="2">3030 Hz</font></td>
<td width="21%" align="center"></td>
</tr>
<tr>
<td width="25%"><font FACE="Arial" SIZE="2">5 % Instrument Accuracy </font></td>
<td width="10%" align="center"></td>
<td width="15%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="14%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="16%" align="center"><font FACE="Arial" SIZE="2">3000 Hz</font></td>
<td width="21%" align="center"></td>
</tr>
</table>
<font FACE="Arial" SIZE="2">
<p>Due to the accuracy of the R2670 </font><font FACE="Courier">(ï¿½</font><font FACE="Arial" SIZE="2">5%),
the final value must be as close as possible to the specification of 3000 Hz (We</font>
<font FACE="Arial" SIZE="2">recommend an error of no more than ï¿½20 Hz).</p>
</font><b><font FACE="Arial" SIZE="2">
<p>Procedure:</p>
</font></b><font FACE="Arial" SIZE="2">
<p>1. Verify that the </font><b><font FACE="Arial" SIZE="2">"Digital
Modulation Compensation" </font></b><font FACE="Arial" SIZE="2">is adjusted
properly using the procedure as outlined in the</font> <font FACE="Arial" SIZE="2">Quantar
RSS manual "Aligning Reference Modulation Compensation, F7 "Align REF
MOD2"</p>
<p>2. Perform </font><b><font FACE="Arial" SIZE="2">"TX Deviation Gain
Adjustment" </font></b><font FACE="Arial" SIZE="2">in RSS Service Mode
using the R2670 settings as described in the</font> <font FACE="Arial" SIZE="2">pre-alignment
checklist. Input the highest of the +/- displayed deviation from the bar graph
with smoothing</font> <font FACE="Arial" SIZE="2">enabled.</p>
<p>The goal is when step 2 is performed with the standard deviation test pattern
enabled in the RSS that 3000 Hz be</font> <font FACE="Arial" SIZE="2">displayed
as close as the R2670 allows.</p>
<p>3. Perform Check </font><b><font FACE="Arial" SIZE="2">"Astro TX Align
and Test" </font></b><font FACE="Arial" SIZE="2">in RSS Service Mode with
"Standard Deviation" enabled.</p>
<p>Step 2 allows you to confirm that the station "Wide Pulse"
deviation is set to 3.0 kHz ï¿½5% and "Narrow Pulse" deviation set</font>
<font FACE="Arial" SIZE="2">to 2.83 kHz </font><font FACE="Courier">ï¿½5% </font><font FACE="Arial" SIZE="2">as
displayed on the R2670 service monitor in "bar graph" mode with
"Deviation Smoothing" enabled via</font> <font FACE="Arial" SIZE="2">the
"expand" command. If the deviation is not adjusted properly, you must
go back and readjust the deviation in step 1.</p>
</font><b><font FACE="Arial" SIZE="2">
<p>Note: </font></b><font FACE="Arial" SIZE="2">If you lower the numbers that
you entered in the TX Deviation Gain Adjust screen when you did the initial
station</font> <font FACE="Arial" SIZE="2">alignment, this will cause the
deviation to be higher. Lowering the entered deviation values by about 40 Hz
should result in</font> <font FACE="Arial" SIZE="2">a 0.1 dB increase in
deviation. Due to variations in the stations, a 40 Hz change may not always be
sufficient. If no</font> <font FACE="Arial" SIZE="2">change is observed, you may
need to increase the value slightly. Re-verify in the "ASTRO TX Align and
Test" mode in the</font> <font FACE="Arial" SIZE="2">RSS that the desired
nominal deviation has been achieved.</p>
<p>For additional information please contact SSC-System Support Center at
1-800-221-7144 and reference bulletin # S-0044</p>
</font><b><font FACE="Arial" SIZE="2">
<p><a name="Information on R2670 service monitor:">Information on R2670 service
monito</a></font></b><font FACE="Arial" SIZE="2"><a name="Information on R2670 service monitor:">r:</a></p>
</font><i><font FACE="Times New Roman" SIZE="2">
<p>Service Information Bulletin 003 February 16, 2001</p>
</font></i><b><font FACE="Times New Roman" SIZE="4">
<p>Communications Test Equipment Sales Information Bulletin - "Deviation
Smoothing"</p>
</font></b><font FACE="Arial" SIZE="2">
<p>In response to numerous customer requests, a new feature has been added to
the R2600C, R2670A, and R2625A series</font> <font FACE="Arial" SIZE="2">of
communications system analyzers. This feature makes aligning radios faster,
easier, and more accurate by reducing the</font> <font FACE="Arial" SIZE="2">display
fluctuations inherent in wideband deviation measurements. These fluctuations are
typically caused by high</font> <font FACE="Arial" SIZE="2">frequency noise, and
are most pronounced when making relatively small deviation measurements in the
wideband RF</font> <font FACE="Arial" SIZE="2">mode.</p>
<p>The feature is automatically invoked when the analyzer is in expanded bar
graph display mode. The bar graph display</font> <font FACE="Arial" SIZE="2">mode
simulates an analog instrument and is useful when making equipment alignments
and adjustments. It graphically</font> <font FACE="Arial" SIZE="2">presents the
data contained in the RF Display meter area of the screen, including Monitor
Deviation, Frequency Error, and</font> <font FACE="Arial" SIZE="2">Input Level.
When in the EXPANDED screen, a special algorithm is implemented that effectively
averages the readings</font> <font FACE="Arial" SIZE="2">and updates the
measurement display approximately once every second.</p>
<p>All units manufactured after November 1st, 2000, including the new color
display models has this feature as standard</font> <font FACE="Arial" SIZE="2">equipment.
To verify a particular unit, check the firmware version number. You can access
this information via the SPF</font> <font FACE="Arial" SIZE="2">function key.
Highlight the VERSION label and select the DISPLAY TABLE softkey. The STANDARD
version number</font> <font FACE="Arial" SIZE="2">should be </font><b><font FACE="Arial" SIZE="2">5.04.xxx
</font></b><font FACE="Arial" SIZE="2">or higher.</p>
<p>Units that do not have this feature can have it added during a standard
calibration procedure or normal repair by the</font> <font FACE="Arial" SIZE="2">Motorola
Test Equipment Service Depot. Please contact them directly at 800-323-6967.</p>
<p>This is an Informational Bulletin only.</p>
<p>No reference to warranty is implied or intended. </font><font FACE="Times New Roman" SIZE="2">Labor
and parts warranty reference is limited to products sold in the United States.
For products sold or in use Internationally this</font> <font FACE="Times New Roman" SIZE="2">bulletin
is for Informational Purposes Only.</p>
</font>
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