Kantronics TALON UDC SERIES User manual

DWG ID: 181-0101-01
Date: 2003-08-12
KANTRONICS
RADIO MODEM SERVICE MANUAL
Kantronics Co., Inc.
1202 E. 23rd Street, Suite A
Lawrence, Kansas 66046
Phone: [phone]
Fax: [phone]
Web: http://www.kantronics.com
TALON UDC
SERIES

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1REVISIONS
Revision Date Description
- 2003-09-11 Preliminary

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2TABLE OF CONTENTS
1 REVISIONS............................................................................................................ 2
2 TABLE OF CONTENTS........................................................................................ 3
3 GENERAL INFORMATION................................................................................. 4
3.1 Sales/Inquiries......................................................................................................... 4
3.2 Technical Support ................................................................................................... 4
3.3 Miscellaneous ......................................................................................................... 4
3.4 Disclaimer Notice ................................................................................................... 4
4 MAINTENANCE INFORMATION ...................................................................... 4
4.1 Repair Cautions....................................................................................................... 4
4.1.1 Surface Mount Repair ............................................................................................. 5
4.1.2 Precautions For Handling CMOS Devices ............................................................. 5
4.2 Unit Disassembly.................................................................................................... 6
4.2.1 To remove Cover .................................................................................................... 6
4.2.2 To remove Rear Panel with Finned Heat Sink........................................................ 6
4.2.3 To remove Finned Heat Sink from Rear Panel....................................................... 6
4.2.4 To remove Front Panel only ................................................................................... 6
4.2.5 If your unit has an I/O, A3, CCA............................................................................ 7
4.2.6 To remove the Controller, A2, CCA....................................................................... 7
4.2.7 To remove the radio transceiver, A1, CCA with heat sink plate ............................ 7
4.2.8 To remove the radio XCVR from the heat sink plate ............................................. 7
4.3 Unit Assembly ........................................................................................................ 7
5 ALIGNMENT......................................................................................................... 8
5.1 Required Test Equipment ....................................................................................... 8
5.2 Alignment Procedure .............................................................................................. 9
5.2.1 TRANSMIT AND RECEIVE FREQUENCY........................................................ 9
5.2.2 RX FREQUENCY TRIM ....................................................................................... 9
5.2.3 CARRIER DETECT............................................................................................. 10
5.2.4 RECEIVER DC OFFSET ADJUST ..................................................................... 10
5.2.5 RECEIVER GAIN ADJUST ................................................................................ 10
5.2.6 TRANSMITTER RF POWER OUTPUT ADJUST ............................................. 11
5.2.7 TRANSMITTER BALANCE............................................................................... 11
5.2.8 TRANSMITTER DEVIATION............................................................................ 12
5.2.9 TX FREQUENCY TRIM ..................................................................................... 12
6 ADDITIONAL INFORMATION FOR A1 ASSEMBLIES................................. 13
6.1 Internal Adjustments............................................................................................. 13
6.1.1 Front-end Inductors............................................................................................... 13
6.1.2 VCTCXO Frequency Adjust................................................................................. 13
6.2 Active Component Voltage Chart for DTX-454 RF CCA ................................... 13
6.3 Active Component Voltage Chart for DTX-154 RF CCA ................................... 18
7 BLOCK DIAGRAM, PRODUCT STRUCTURE, PARTS LISTS, SCHEMATIC
DIAGRAMS, AND PARTS LAYOUTS ............................................................. 23

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DWG ID: 181-0101-01
Date: 2003-08-12
3GENERAL INFORMATION
3.1 Sales/Inquiries
Phone: [phone] (8 AM to 5 PM, Central Time, Monday through Friday)
Fax: [phone]
E-mail: [e-mail]
Web site: http://www.kantronics.com
3.2 Technical Support
Phone: [phone] (8 AM to 12 noon and 1 PM to 5 PM, Central Time, Monday
through Friday)
Fax: [phone]
E-mail: [e-mail]
3.3 Miscellaneous
The Kantronics TALON UDC (universal data controller) series of radio modems is
manufactured in the U.S.A.
All brands and product names are trademarks of their respective companies.
3.4 Disclaimer Notice
We have attempted to make this manual technically and typographically correct as of the
date of the current issue. Production changes to the TALON UDC series may add
changes to the manual at a later date.
Send comments or suggest corrections to Kantronics Co., Inc., 1202 E. 23rd Street, Suite
A, Lawrence, KS 66046, or e-mail [email protected].
Information in this document is subject to change without notice.
Contents of this publication or the firmware within the TALON UDC series may not be
reproduced in any form without the written permission of the copyright owner.
Published in the United States of America.
4MAINTENANCE INFORMATION
Refer to the last section for parts lists, schematic diagrams, and parts layout diagrams.
4.1 Repair Cautions

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CAUTION
Equipment contains electrostatic sensitive components that could be
damaged through handling. Take proper ESD precautions.
4.1.1 Surface Mount Repair
Surface mount products require special techniques and equipment. Improper servicing
can permanently damage the printed circuit board and/or components; any such
RESULTING DAMAGE IS NOT COVERED by the Kantronics warranty.
4.1.2 Precautions For Handling CMOS Devices
CMOS parts require special handling, because their circuits are very susceptible to
damage from electrostatic or high voltage charges. This damage can be latent, with
failures not appearing until weeks or months afterward. Because of this susceptibility to
damage, be aware that the proper handling of CMOS devices is even more critical in low
humidity environments. Observe the following special precautions:
4.1.2.1 Storage/Transport
Place CMOS devices to be stored or transported in conductive material with all exposed
leads shorted together. Do not insert CMOS devices into conventional plastic “snow” or
into plastic trays as are used for other semiconductors. The proper conductive containers
for CMOS devices are typically gray or pink in color.
4.1.2.2 Grounding.
All CMOS devices must be placed on a grounded bench surface. Also, the technician
(working on the equipment/CMOS circuit) must be grounded, usually by wearing a
conductive wrist strap in series with a 100 kresistor to ground.
4.1.2.3 Clothing
Do not wear nylon clothing while handling CMOS circuits.
4.1.2.4 Power Off
Remove power before connecting, removing or soldering a printed circuit board
containing CMOS devices.
4.1.2.5 Power/Voltage Transients

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Do not insert or remove CMOS devices with power applied. Check all power supplies
used for testing, to ensure no voltage transients are present.
4.1.2.6 Soldering
Use a soldering iron having a grounded tip for soldering CMOS circuitry.
4.1.2.7 Lead-Straightening Tools
When straightening CMOS leads, provide ground straps on the straightening tool.
4.2 Unit Disassembly
4.2.1 To remove Cover
Remove four screws on bottom, two top screws each from Front and Rear Panel, and two
screws on top near the left end side.
4.2.2 To remove Rear Panel with Finned Heat Sink
Remove two top screws, one bottom screw, two #2 nuts and lock washers, two #4 nuts
and lock washers next to #2 hardware, and two screws that hold panel to chassis.
If Cover is removed already, remove one bottom screw, two #2 nuts and lock washers,
two #4 nuts and lock washers next to #2 hardware, and two screws that hold panel to
chassis.
4.2.3 To remove Finned Heat Sink from Rear Panel
(With Rear Panel and Finned Heat Sink as a unit.) Remove two #4 nuts and lock washers.
4.2.4 To remove Front Panel only
Remove two top screws, one bottom screw, two screws that hold panel to chassis, and the
two jack screws for the Serial I/O connector.
If Cover is removed already, remove one bottom screw, two screws that hold panel to
chassis, and the two jack screws for the Serial I/O connector.
If necessary, to completely remove the Front Panel out of the way, the ANT connector
and the GPS connector may be removed from the panel.
Note: Handle the ANT connector and cable with caution. Do not allow the cable to move
around excessively or the center conductor and/or cable braid will break at the radio
transceiver connection points.

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4.2.5 If your unit has an I/O, A3, CCA
This will be the CCA on top. If your unit does not have an I/O CCA the Controller, A2,
CCA will be on top. In either case the top CCA is held on by three #4 screws and lock
washers.
4.2.6 To remove the Controller, A2, CCA
Either remove three #4 screws with lock washers or, if your unit has an I/O, A3, CCA
and that is removed, remove three standoffs. After removing the three screws or
standoffs, remove the #4 hardware holding the heat sink tab of voltage regulator A2VR1.
Remove the two #2 self-tapping screws that hold the Controller CCA to the radio
transceiver heat sink at left rear of unit. Turn unit upside down with left hand, grab
Controller CCA with right hand, and pull Controller CCA off of radio transceiver by
rocking slightly front to back so mating connector will come apart. Watch for the four #2
flat washers that will fall off and ferrite beads on the leads of connector A2P1.
4.2.7 To remove the radio transceiver, A1, CCA with heat sink plate
Remove two standoffs from near the front.
4.2.8 To remove the radio XCVR from the heat sink plate
Remove two #2 screws and lock washers.
4.3 Unit Assembly
Assembly is the reverse of disassembly.
Be sure to use silicone heat sink compound
•Between radio transceiver heat sink and heat sink plate
•Between heat sink plate and inside of rear panel
•Between outside of rear panel and finned heat sink
•Between voltage regulator, A2VR1, heat sink tab and chassis
•Between chassis top lip and inside of top cover
This all for best heat flow.
To assemble the Controller, A2, CCA to the radio transceiver assembly, A1:
•Place the #2 self-tapping screws in their holes
•Place masking tape over their heads to hold them in place
•Turn the Controller CCA upside down
•Place 4 #2 flat washers, two each, over the #2 screws
•Install 6 ferrite beads, 3 each over A2P1-1 and A2P1-7

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•If the Front Panel is not attached to the ANT connector, twist the connector clockwise
and loop the coaxial cable so it will lie over the top of the backside of the connector,
with the connector facing towards the front.
•Hold the Controller CCA (upside down) in your right hand
•With the left hand turn the chassis upside down
•Mate the Controller CCA to the radio transceiver
•The pins of A2P1 must match to A1J101, the two sets of #2 hardware must line up
with the holes in the radio XCVR heat sink, and the holes near the front of the
Controller board must align to the standoffs holding the radio XCVR to the chassis
•Turn unit right side up
•Push down on Controller CCA to make sure it is in place
•Remove masking tape from #2 screws and with a flat blade screwdriver screw the #2
self-tapping screws into place
•Install 3 #4 lock washers and 3 #4 screws to hold down Controller CCA
•Install #4 screw through heat sink tab of A2VR1 and chassis
•Hold in place with #4 lock washer and #4 nut
5ALIGNMENT
WARNING
Only qualified and trained service personnel must perform
alignment.
5.1 Required Test Equipment
The following test equipment is required to align the TALON Series radio modems. All
test equipment should be properly calibrated with traceability to NIST or your country’s
authority.
Service monitor or
•RF signal generator at operating frequency of equipment with output level
adjustment and FM.
•FM demodulator, that can drive a deviation meter
•Deviation meter
•RF frequency counter: Must operate at the RF frequency of the equipment, with a
resolution of 10 Hz or better, and accuracy of ±1PPM (±150 Hz at VHF, ±450
Hz at UHF) or better.
•RF power meter: Capable of accurately indicating the equipment RF power
output.
•RF power attenuator or dummy load with coupled output. Must be 50 
impedance at the operating frequency, rated for the output power of the

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equipment, and have an output which can drive the FM demodulator and
frequency counter at the correct level.
Audio oscillator: Must have sine wave and square wave output and adjustable output
frequency and amplitude.
Voltmeter for dc: 10 Minput impedance. Any good DMM will have this.
Oscilloscope: 20 MHz bandwidth and X10 probe.
Power Supply: Capable of approximately 12 V dc at 3 A.
Note that alignment instructions are written for a service monitor.
5.2 Alignment Procedure
It is not necessary to perform all alignment steps detailed below. However, some
adjustments have interaction with others (e.g.: balance affects deviation and output power
has a slight affect on TX frequency trim). It is recommended to spot check all
adjustments.
Refer to the last section of this manual for parts lists, schematic diagrams, and parts
layouts.
After removing the cover:
•Jumper A2J8 with A2P3
•Be sure A2P2 is in place across A2J7
•Connect a PC to the TALON Series unit Serial I/O port via an RS232 cable assembly
•Open a communications program, such as HyperTerminal™ found in Windows™.
Set communications for COM port you set up (usually COM1), 38400 baud, no
parity, 8 data bits, and 1 stop bit
•Attach the ANT connector to a communications service monitor
•Apply dc power to the unit
•Observe the correct display on the PC’s VDT
Note:
•Press the “Esc” key to get out of any command
•Press the “B” key (PERM Radio parameters), when not in any other command, at any
time to make adjustment parameters permanent
5.2.1 TRANSMIT AND RECEIVE FREQUENCY
Set transmit and receive frequencies with the “T” key to frequency of operation.
Note: If the receive frequency is the same as the transmit frequency, just enter the
transmit frequency. Receive frequency will be set automatically. Otherwise, press the “R”
key and set the receive frequency.
5.2.2 RX FREQUENCY TRIM

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Press the “1” key for the RX FREQUENCY TRIM and set the 1st LO on frequency using
a frequency counter connected to the ANT port. (The 1st LO frequency is indicated on the
VDT screen next to the RX FREQUENCY). The offset voltage at A2P1-7 will be 2.50
Vdc. This setting, if incorrect, will degrade receive sensitivity and distortion.
When in RX FREQUENCY TRIM, certain stages in the transmit chain are enabled,
which cause local oscillator leakage at the ANT connector to be stronger than normal.
Even so, the level may be less than 0 dBm. The frequency counter must be connected
directly to the ANT connector and be able to operate at this level.
CAUTION: DO NOT PLACE THE UNIT IN A TRANSMIT MODE DURING THIS
PROCEDURE: SERIOUS DAMAGE TO THE COUNTER WILL RESULT.
5.2.3 CARRIER DETECT
•Set service monitor generator frequency to receive frequency of radio modem
•No modulation
•Set service monitor power output to signal level required for carrier-detect to go true.
Press the “2” key for CARRIER DETECT ON TRIM adjustment. Adjust until there is a
constant ON (on the VDT) indicated. This may be monitored at A2AR2-1 with a dc-
coupled oscilloscope. There should be a 5 V dc level with no negative going glitches.
•Set the service monitor power output to signal level required for carrier-detect to go
false.
Press the “3” key for CARRIER DETECT OFF TRIM adjustment. Adjust until there is a
constant off. The ON indicator (on the VDT) being off indicates this. Continue
monitoring at A2AR2-1 with dc-coupled oscilloscope. There should be a 0-V dc level
with no positive going glitches.
5.2.4 RECEIVER DC OFFSET ADJUST
Set service monitor power output for a level above the carrier-detect on level with 1200
Hz tone at 2.3 kHz deviation modulation on.
Measure VBIAS at MX919B IC terminal 21 (A2U3-21).
Press the “4” key for the RECEIVER DC OFFSET ADJUST.
Adjust this to get measured VBIAS value at MX919B IC terminal 23 (A2U3-23).
5.2.5 RECEIVER GAIN ADJUST
Set modulation at a 1200 Hz tone for 2.3 kHz deviation.