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DU-1500 Manual 

The DU 1500 optimizes the performance of your antenna and transmitter or SWL receiver

By providing adjustable impedance matching.The DU 1500 also measures the Power and

Standing Wave Ratio (SWR),which allows you to tune the indicted SWR to the lowest possible ratio for the selected transmit frequency.

 

SPECIFICATION

 

FRONT PANEL INDICATORS AND CONTROLS

 

Meter…………………………Cross needle Power and SWR meter.

 

CONTROLS

 

Input Tuning………………….Continuous rotation 4,5kV capacitor 330pF

 

Output Tuning………………...Continuous rotation 4,5kV capacitor 330pF

 

Antenna Switch Selector………Five position ceramic switch:COAX 1, Tuned and

                                                    COAX 2 Tuned and BYPASS,COAX 1 DIRECT,

                                                    COAX 2 DIRECT

Power Range Switch…………..Two position: 200W/2kW

 

REAR PANEL CONNECTORS

 

Coax 1…………………………...SO-239 Teflon connector

Coax 2…………………………...SO-239 Teflon connector

 

Balanced Line……………………Dual high voltage ceramic terminal

                                                        Include 4:1 balun

OTHER

Frequency Coverage……………...1.8-30MHz ,continuously tunable

Power Maximum…………………1500W max 2kW

Input impedance………………….50ohm

Output inoedance…………………25-600ohm and wire 2000ohm

Dimension………………………...H 330xW 330xD 120

Weight…………………………….10lbs.(4,5kg

CONTROL/CONNECTORS

 

 FRONT PANEL FUNCTIONS

     1  Output (Antenna)

Continously adjustable input capacitor

     2. POWER/SWR METER

 

               Dual needle meter displays FORWARD and REFLECTED Power in Watts.

               The SWR in measured where the two needles intersect on the red scale.

     3. INPUT (Transmitter)

             Continuously adjustable output capacitor.

     4. DIRECT-TUNED OUTPUT SELECTOR

           Five-position rotary switch an output coaxial connector.

                 1. TUNED COAX 1 selects theCOAX 1connector trough the impedace matching      

                     circuit.

                 2. TUNED COAX 2 selects the COAX 2 connector trough the impedance matching

                     circuit.

                 3. DIRECT BYPASS selects BYPASS COAX connector bypassing the impedanc

                    matching circuit but provinding SWR,FORWARD,and REFLECTED power

                    meter readings.       

                 4. DIRECT COAX 1 select the COAX 1 connector bypassing the impedance

                    matching circuit but providingSWR,FORWARD, and REFLECTED meter

                    readings.

                 5. DIRECT COAX 2 selects the COAX 2 connector bypassing the impedance

                     matching circuit but providing SWR,FORWARD,and REFLECTED meter

                     readings.

                 6. TUNED WIRE/BAL selects the BAL.LINE+COAX 1 connector through the

                     impedance matching circuit.

     5.POWER RANGE SWITCH

             Two-position switch selects the range (200W or 2kW) of FORWARD and

             REFLECTED Power displayed ont he power meter.

              

             When the METER ( power range) switch 200W the FORWARD meter

             Scale reads 200W full scaleand the REFLECTED meter scalereads 40W

             Full scale.

             When the METER switch 2kW,the FORWARD meter scale reads 2kW

             Full scale and the REFLECTED meter scale reads 400W full scale.

     6.BAND SWITCH

 REAR PANEL CONNECTORS

 

 

 1.      RF INPUT

          

          Coaxial connector for input from SWL receiver or transmitter.

 

 2       COAX 1

 

          Coaxial connector for output to Antenna One.Or Wire Antenna

 

 3.       COAX 2

          

           Coaxial connector for output to Antenna Two.

 

 4.       BYPASS

          

          Coaxial connector for output to dummy load or third coax output.

 

 5.       GROUND

 

           Post/Wing-nut type ground connector.

 

 6        BALANCED OUTPUT

 

            Two ceramic post for output toRF balanced twin-lead antennas.

 

 7.         INSTALL JUMPER

 

 INSTALLATION

 

Select a location for the DU 1500 that allows the connectors to be free of any possible

Contact during operation.

 

WARNING:

SOME BALANCED OR END-FED ANTENNAS WILL PRODUCE

HIGH RF VOLTAGES AT THE BANANA CONNECTORS.RF

BURNS MAY RESULT IF TOUCHED DURING TRANSMISSION.

 

INSTALLATION PROCEDURES

 

 1.   Connect a coax cable from your transmitter or receiver to the RF INPUT connector on

       the rear panel.Keep the cable as short as possible. If you use a linear amplifier,connect

       your transmitter to the linear amplifier output to the DU 1500.

 

 2.   Connect coax cable(s) from your antenna to COAX 1 or COAX 2 connectors ont he rear

       panel.Thes connectors are either direct from the transmitter or trough the tuned circuit

       depending ont he setting of the OUTPUT SELECTOR switch ont he front panel.

 

3        If you are using a balanced feed antenna,connect the INSTALL JUMPER in the COAX 1 connector and switch  band switch TUNED COAX 1.

 

 4.   If using a single wire antenna,connect itt o post  COAX 1 without installing jumper.

 

 5.   Connect a dummy load to the BYPASS  CONNECTOR using a coax cable.This

       lets you select the dummy load from the OUTPUT SELECTOR switch.Any antenna

       that does not require the use o fan antenna tuner may be connected to the BYPASS

       connector,if desired.

 

BEFORE OPERATION

 

 1. To avoid possible damage to the DU 1500,set INPUT,OUTPUT,BAND SWITCH

    and POWER RANGE switches as outlined int he next section before applyng

    transmitter power.(Tuning Section)

 2. Begin tuning with your transmitter se tat a low power setting ( 50 to 100W)

 

WARNING: DO NOT OPERATE THE DU 1500 WITH THE COVER OFF!

TUNING

 

1.  Select the band and frequency of desired operation.

 

2.  Set INPUT,OUTPUT,and BAND SWITCH controls to the suggested settings before

     applyng transmitter power.Actual settings may vary from antenna to antenna.

 

3.  Set up your transmitter to a low power output.If you transmitter has a TUNE

       position,select that position.

 

4.    If you use a linear amplifier,set itt o STANDBY. Do not use the linear amplifier

       until the DU 1500 is tuned.

 

WARNING:DO NOT EXCEED 1500WATTS AVERAGE(SINGLE TONE).

 

 

5.  Set POWER RANGE switch to 200W.

 

 

6.  Set OUTPUT SELECTOR switch to BYPASS,or the position matching your antenna

     connection.To tune your antenna,the switch selection must be set to:COAX 1 TUNED

     COAX 2 TUNED,or BAL.LINE+COAX 1.Selecting COAX 1 DIRECT,COAX 2   

      DIRECT, or BYPASS.

 

 

7.  Rotate the INPUT and OUTPUT controls for maximum noise or signal as heard

     on your receiver.

 

 

8.  Key your transmitter and adjust the power level for a reading of 50-100 watts on the

     FORWARD scale.Adjust the INPUT and OUTPUT controls for

     a minimum REFLECTED reading while maintaining a FORWARD reading of 50-

     100 watts using your transmitter power control.

 

 

9.  Read the SWR on the red scale at the point where the two needles intersect.Repeat step

     8 until the lowest SWR reading is obtained. The SWR should be 2:1 or lower.

     NOTE:This procedure takes patience the first time.The INPUT and OUTPUT

     Controls vary the capacitors and provide fine adjustments.

 

 NOTES

 

 

1.   An SWR or 1:1 is best,buta n SWR as high as 2:1 may be acceptable. Check

      you transmitter manual for details.

 

2.   If you cannot get an acceptable SWR, lengthen or shorten you antenna and/

      or feedlines and retune.

 

3.   If you grt low SWR readings at more than one setting,use the setting that:

     

      Gives the highest FORWARD power reading.

 

      Gives the lowest REFLECTED power reading.

 

      Uses the largest capacitance (highest number) ont he TRANSMITTER and

      ANTENNA controls.

 

4.   Any time a new or different antenna is connected,it is necessary to repeat the tuning

      procedure for each antenna.