Description

Vine Antenna DU-1500T 1.5Kw Antenna Tuner

LAMCO Barnsley

Vine Antenna DU-1500T 1.5Kw Antenna Tuner LAMCO Barnsley

Please be aware these ATU’s are due to leave the factory during the last week of April 2024.

There are ten pieces available. These are a first come first served basis after being out of production for over two years.

 

 

FEATURES

LAMCO DU-1500T

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.

 

LAMCO DU-1500T

SPECIFICATION

 

FRONT PANEL INDICATORS AND CONTROLS

LAMCO DU-1500T

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

 

CONTROLS

LAMCO DU-1500T

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

 

Antenna 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

!!1.8MHz SWR wors then 1:3 MAX 800W!!

 

 

REAR PANEL CONNECTORS

LAMCO DU-1500T

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

Coax 2……………………………SO-239 Tflon 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)

LAMCO DU-1500T

 

CONTROL/CONNECTORS

 

FRONT PANEL FUNCTIONS

1.     Output (Transmitter)

Continously adjustable input capacitor

LAMCO DU-1500T

     2. POWER/SWR METER

LAMCO DU-1500T

Dual needle meter displays FORWARD and REFLECTED Power in Watts.

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

LAMCO DU-1500T

     3. INPUT (Antenna)

LAMCO DU-1500T

Continuously adjustable output capacitor.

     4. DIRECT-TUNED MODE SWITCH

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.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.

 

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.

 

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.

 

• If you are using a balanced feed antenna,connect the INSTALLJUMPER 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

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.