HA8DU DU 3500 AL User manual

Made in Hungary
USER MANUAL DU 3500 AL
Automatic antenna tuner 3,5 kW

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TABLE OF CONTENTS:
1. FEATURES ............................................................................................................................................ 3
2. SPECIFICATIONS ................................................................................................................................. 3
3. FRONT PANEL CONTROL .................................................................................................................... 4
4. REAR PANEL CONNECTORS................................................................................................................ 5
5. SETTINGS ............................................................................................................................................. 7
5.1. TCVR & Serial port setup .......................................................................................................... 8
5.2. Antenna selection....................................................................................................................... 8
5.3. Setting the brightness of the display ...................................................................................... 9
5.4. Selection of the internal or the external antenna switch .................................................... 9
5.5. Antenna port ............................................................................................................................. 10
6. TUNING............................................................................................................................................... 11
7. Automatic mode................................................................................................................................ 13
8. Manual setting .................................................................................................................................. 14
9. Example of connection ........................................................................Error! Bookmark not defined.
9.1. Example of connection for antennas ........................................Error! Bookmark not defined.
9.2. Example of connection for YAESU..............................................Error! Bookmark not defined.
9.3. Example of connection for Icom ................................................Error! Bookmark not defined.
9.4. Example of connection for USB micro KEYER II with Yaesu or ELECRAFTError! Bookmark
not defined.

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1. FEATURES
The DU 3500 AL automatic tuner has been primarily manufactured for an automatic PA, but it
can also be used with any manual PAs as well. The tuner is primarily compatible with the OM
POWER automatic PA.
This tuner was designed for antennas calibrated to HAM BANDs. The maximum power can only
be utilized with these antennas. With other antennas, it should be set at a lower power (max.
2kW).
The major advantage of the tuner is that during competitions it is possible to change BANDs
particularly quickly.
2. SPECIFICATIONS:
Frequency range :
1,8-30MHz
Matching range :
max power 5:1 SWR
Output Power :
3,5kW
Compatibility:
All automatic OM-POWER
Tuning time:
1-3 s programmed memory
Display :
480x272 4,3” Color TFT Display
Capacitor :
510pF 5kV
Ceramic switch :
2 rotary switch
Antenna switch :
4 ant + 8 port
DC power :
12 - 13.8V 6A
Dimensions (cm) :
W34xD47xH16,5
Weight :
8 kg

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3. FRONT PANEL CONTROL
1. TFT DISPLAY: 480x272 4,3” Color TFT Display
2. CAPACITOR: 510pF 5kV
3. FUNCTION BUTTONS: Selection menu functions
4. POWER SWITCH: Power ON/OFF
1.TFT DISPLAY 2. CAPACITOR
3. FUNCTIONS BUTTONS 4. POWER SWITCH

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4. REAR PANEL CONNECTORS
5. ANTENNA CONFIGURATION: 1-8 +12V INT. PWR
6-8 GND INT. PWR
9-8 EXT. PWR.
6. ANTENNA SWITCH: ANT & BPF SW DB-25 is used for switching external
Antenna Switch. Maximum switching of 30V / 0.5A is possible.
PIN OUT: 1. antenna port 1
2. antenna port 2
3. antenna port 3
4. antenna port 4
5. antenna port 5
6. antenna port 6
7. antenna port 7
8. antenna port 8
9. antenna port 9
10. antenna port 10
11. COMMON port of ANT SW
12. NC
13. GND
5. 6. 7. 8.
9. 10. 11. 12. 13. 14.
15.
16.
17.

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7. DUMMY LOAD
8. INPUT 50Ω
9. PTT IN: RCA Input signal PTT switching voltage / current 30V / 50mA)
10. PTT OUT: RCA Output signal PTT (maximum switching of 30V / 50mA)
11. TCVR: DB9 serial port RS232 for KENWOOD, YAESU and ELECRAFT TCVRs. Correct baud rate
and type is required for successful operation. If both CI-V and TCVR cables are connected then
CI-V disables RS232. Otherwise selection of interface is done via TCVR type.
12. PC: DB -9 RS232 port is used for communication with your PC. Please use setting you would
normally use if using direct TCVR –PC connection.
13. GND
14. ANT OUTPUT
15. FUSE 6,3A
16. CI-V: Mono 3.5mm Jack for connection of ICOM TCVRs or devices that provide compatible
CI-V protocol. Correct baud rate is important.
17. DC 12V 6,6A INPUT

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5. SETTINGS
TCVR & PORT –selects the radio type and the parameters for the serial port
ANTENNA –selects the antenna
DISPLAY CONTRAST –the brightness of the display
EXTERNAL ANT. SWITCH –sets the external antenna switch
SOFTWARE VERSION –the serial numbers of the programs used
LOAD DEFAULT VALUES –during manufacture the tuner is tuned to an ideal 50 ohm antenna.
The values for this can be recalled from the memory. If we select this menu point with the SET
button, then the question “Are You Sure?” appears. If the SET button is pressed again, then the
base values set during manufacture reappear. Warning! In this case all the values set by you will
be lost! If one reconsiders and does not want to erase this data, then press the BACK button.

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5.1. TCVR & Serial port setup
Selection of the radio and communication parameters:
With the DOWN and UP buttons, it is possible to select the radio type.
With the SPEED button it is possible to determine the transmission speed, and with the STBIT
button it is possible to determine the number of the STOP bits. The selected parameters are
saved with the SAVE button, and then we return to the settings menu.
5.2. Antenna selection
The type of antenna does not directly affect the operation of the tuner. This menu point is only
for ease of use, so that it is easier to note which antenna is connected to the tuner.
With the ANT1, ANT2, ANT3 and ANT4 buttons it is possible to select the antenna types
connected to the individual outputs. The EXT.SW indicates that an external antenna switch is
connected to the tuner.
With the SAVE button we place the selected antenna types into the memory and return to the
settings menu point

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5.3. Setting the brightness of the display
With the DOWN and UP buttons it is possible to set the brightness of the display. The value set
is placed in the memory with the SET button, or with the BACK button it is possible to return to
the settings menu. In this case the brightness value set is not put in the memory.
5.4. Selection of the internal or the external
antenna switch
In this menu point it is possible to have the internal antenna switch be active, or instead the
external antenna switch that is connected to the tuner. With the DOWN and UP switches it is
possible to select the amateur band, and with the CHANGE button whether the internal or
external antenna switch is selected.
If the external antenna switch is selected, then the word PORT appears in the empty button. By
pressing this, the next menu point appears, where it is possible to select which port
corresponds to the external antenna switch of the four possible antennas.

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5.5. Antenna port
With the DOWN and UP buttons on the left side it is possible to select the individual antenna
positions, and with the DOWN and UP buttons on the right side it is possible to select the
corresponding ports on the external antenna switch. If all 4 antennas have been set, then it is
possible to return to the previous menu point with the BACK button.