Product data were exported from - Vine Antennas UK HAM Radio Amateur Radio Accessories Antennas ATU's
Export date: Thu Jul 1 10:51:45 2021 / +0000 GMT
WARNING: DO NOT OPERATE THE DU 3000 WITH THE COVER
OFF!
NOTES
- An SWR or 1:1 is best, but an SWR as high as 2:1may be acceptable. Check you transmitter manual for details.
- If you cannot get an acceptable SWR, lengthen or shorten you antenna and/or feedlines and retune. - If you get
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) on the TRANSMITTER and ANTENNA controls.
- Any time a new or different antenna is connected, it is necessary to repeat the tuning procedure for each
antenna.
OPERATION INSTRUCTIONS
The followings set of instructions will allow the operator to quickly place the DU 1500 L into
operation.Included are descriptions of the fromt panel controls and their functions.
This is followeed by instructions for antenna matching and selection,and a brief discourse on antenna systems matching
thery.
(1)CAPACITOR
This control connects to tje variable tunung capacitor used as one of the elements in the
L type matching network.This capacitor has a tuning range of 40-500pF and is continuous tuning with no stops.
(2)INDUCTOR
This control is connected to the roller inductor,another element int he L type matching network.This inductor has a tuning
range of 0,2-18uH which is coveredin approximately
30 revolutions of the control knob.A gear reduction system behind the front panel of the
DU 1500 L is connected to a concentric skirt turns counter numbered 0-29 in 180 degree
Arc over the top of this control,to make returning to earlier settings easier and quicker.
(3)IMPEDANCE SWITCH
This 11 position rotary switch is used to change the configuration of tuning network
For matching eitherhigh or low impedance antenna systems.This switch also selects
Additional capacitors as needed for matching at lower frequencies.When placed in the
12o'clock position,the tuner is connected to the BYPASS configuration and the
network has on effect ont he transmission line systems(antennas are fed through directly from the transmitter to the
antenna without use of the tuner.)The SWR and power metering remains usable even when this switch is set to
BAYPASS.
The purpose of this switch is to set the capacitor either across the input or across the antenna,
Depending on whether a load of above or below 50 ohms is trying to be matched(reverses the
L network).
(4)ANTENNASELECT KNOB
This 3 position switch is used to select one of up to four antennas conected to the rear panel
Of the DU 1500 L and correspond to theCOAX1,COAX2,COAX3 connectors.
(5)METER
The meter on model DU 1500 L dual crossneedle SWR and wattmeter.
Forward power output ismeasured on the right-hand needle,left-hand scale.
Reflected power is read on the left-hand needle,right-hand scale. SWR is read
by reading the point at which the two needles cross on the red scale lines on the
face of the meter.
Power output is read in switchable scales of 200 or 2000 watts.
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