Digital Control Unit
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Amateur Radio Directory
for HAM-IV and T-2X
Model DCU-1/ DCU-1X
Instruction Manual
308 Industrial Park Road
Starkville, MS 39759 USA
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TABLE OF CONTENTS
Page
Chapter 1- Installation and Operation .................................................................................................... 1-1
Section 1. Components of the DCU-1 "Pathfinder" digital Control Unit.......................................... 1-1
General ............................................................................................................................................. 1-1
Section 2. DCU-1 Digital Control Unit Specifications...................................................................... 1-2
Section 3. Precautions....................................................................................................................... 1-3
Section 4. Installation......................................................................................................................... 1-4
Section 5. Wiring and Check Out ...................................................................................................... 1-5
Section 6. Operation of DCU-1 Control Unit.................................................................................... 1-8
Computer Operation......................................................................................................................... 1-9
Section 7. Troubleshooting............................................................................................................... 1-11
Ground Wires ................................................................................................................................ 1-12
Antenna Motion ............................................................................................................................. 1-12
Lack of Power................................................................................................................................ 1-12
Checking the Control Unit Voltages.............................................................................................. 1-13
Checking the Rotator Resistances from the Ground...................................................................... 1-13
Section 8. DCU-1 Control Unit Block Diagrams............................................................................. 1-14
Section 9. DCU-1 Control Unit Replacement Parts List.................................................................. 1-15
Section 10. How to Get Factory Service.......................................................................................... 1-16
Warranty .......................................................................................................................................... 1-17
LIST OF ILLUSTRATIONS
Page
1 Front View ............................................................................. ............................... 1-2
2 Back .......................................................................... ............................................ 1 -2
3 Control Cable Connector Attachments .................................................................... 1-5
4 DCU-1 Display .................................................................................... .................. 1-7
5 Wiring Guide ................................................................... ...................................... 1 -9
6 Command .................................................. .............................................. .............. 1-9
7 Sample Program......................................................................................... ........... 1-10
8 Front Panel PCB ............................ ............................................... ........................ 1-14
9 Control PCB and External Components ................................................................ 1 -14
List of Tables
Table
1 Wiring and Check-Out...................................................................... ..................... 1-5
2 Control Cable.................................................................................................. ....... 1-6
3 Troubleshooting............................................................................................. ........1-11
4 Control Unit Voltages............................................................ ............................... 1-13
5 Rotator Resistances....................................................... .........................................1 -13
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CHAPTER 1 INSTALLATION AND
,
Section 1. Components of the DCU-1 "Pathfinder" Digital Control Unit
General Description
The DCU-1 "Pathfinder" digital control unit fea-
tures 6 memory presets, automatic brake delay
(8 seconds), automatic motor slowdown (last 5
degrees), automatic motor control on startup,
programmable center of rotation, full circle
analog display of current and target bearings,
digital display of current and target bearings,
automatic display blanking of target bearings,
automatic display blanking (30 minutes), RS232 control with passthrough, and an 8 pin
socket for the control cable.
Your existing rotator unit (HAM IV, T2X, or
compatible) must be connected to the control
unit with an 8-wire cable. You may use your
existing cable, you may assemble your own
cable from the information supplied in this
manual
The DCU-1 "Pathfinder" digital control unit
consists of the following main components:
PN 870804 DCU-1 Control Unit Assembly
PN 870805 Parts Pack DCU-1 (120 VAC)
PN 870843 Parts Pack DCU-1 (220 VAC)
or you may purchase pre-assembled
Section 2. DCU-1 Digital Control Unit
(
)
DCU-1 Digital Control Unit Specifications:
Size
8.5"x4.3"x9.0" (W x H x D)
21.6 x 11.0 x 22.8 cm
Control Unit Display:
Type Gas Plasma, Amber filter
Scale 5 degree (Analog), 1 degree (Digital)
Blanking Target Bearing (8 seconds)
Total (30 minutes after no activity)
Display Life 30,000 to 40,000 Hours
Memory Presets 6, independently programmable
Rotation Center User selectable,
Brake Delay
Automatic Motor Control
Front Panel Controls
Figure 1
Front View
Section 3. Precautions
g
Metal towers must be grounded properly at the
tower location before the DCU-1 "Pathfinder" is
connected to the rotator. This is to minimize
electrical hazard and the possibility of lightning
damage. DO NOT bury bare aluminum wires or
stakes in the ground. Use copper or copper-clad
ground stakes. The service entrance ground
should be checked. The household convenience
outlet should be the 3-prong type (grounded back
to the service entrance). Connect a ground wire to
the DCU-1 ground terminal.
The DCU-1 Control Unit is not weatherproof and
must be located in a house or other protected
location. The DCU-1 should not be exposed to
temperatures over 130°F!
NOTE:
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable
protection against harmful interference in a
residential installation. This equipment generates,
uses and can radiate radio frequency energy and if
not installed and used in accordance with the
instructions, may cause harmful interference to
radio communications. However, there is ao
guarantee that interference will not occur in a
particular installation. If this equipment does
cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to
try to correct the interference by one or more of
the following measures:
- Reorient or relocate the receivin
- Increase the separation between the
- Connect the equipment into an outlet on a
circuit different from that to which the receiver
- Consult the dealer or an experienced
radio/TV technician for help.
The DCU-1 "Pathfinder" digital control unit has
been carefully designed and manufactured to give
many years of trouble-free service when carefully
and professionally installed. It consists of the
strongest and best commercially available components.
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