Vectronics VC-300D User Manual
VC-300D Digital Bargraph Antenna Tuner Owner's Manual
Vectronics VC-300D
DIGITAL BARGRAPH ANTENNA TUNER
FEATURES
The Vectronics VC-300D Antenna Tuner optimizes the performance of your antenna and
transmitter, receiver, or transceiver by providing adjustable impedance matching. The
tuner also measures the Power and Standing Wave Ratio (SWR), allowing you to adjust
for the lowest possible ratio for the selected transmit frequency. It utilizes a precision
frequency compensated lighted dual movement SWR/Power meter which can show either
peak or average readings. Also included is a built-in dummy load for tuning purposes
which is easily switched in and out of the of the circuit. The tuner features a
revolutionary new digital bargraph display that enables you to see real peak SSB power
relative to full CW power. Levels and delay are front panel adjustable.
SPECIFICATIONS
FRONT PANEL INDICATORS
Meter .....................................Dual movement D'Arsonval lighted cross needle Power and
SWR meter.
Bargraph Display...................20 segment LED display
FRONT PANEL CONTROLS
TRANSMITTER Tuning ......Continuous rotation capacitor
ANTENNA Tuning...............Continuous rotation capacitor
INDUCTANCE.....................12 position switched Inductor
OUTPUT SELECT ...............Eight position: DIRECT coax 1, coax 2, bypass and dummy
load; TUNED coax 1, coax 2, wire and dummy load
LEVEL.................................. Adjust display to 100% of CW power
DELAY .................................Adjust the rate at which the display returns to zero
RANGE................................. 2 position switch: 30W/300W
REAR PANEL CONNECTORS
COAX 1.................................SO-239 connector
COAX 2.................................SO-239 connector
BYPASS................................ SO-239 connector
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VC-300D Digital Bargraph Antenna Tuner Owner's Manual
TRANSMITTER IN.............. SO-239 connector
BALANCE LINE.................. Dual Banana jack
WIRE..................................... Banana jack
OTHER
Frequency Coverage.............1.8-30 MHz
Power Maximum..................150 Watts Continuous; 300 Watts PEP
Dimensions...........................3.5" H x 10.2" W x 9.4" D
Weight................................... 3.7 lbs.
CONTOLS / CONNECTORS
FRONT PANEL FUNCTIONS
1. TRANSMITTER
Continuously adjustable input capacitor
2. POWER / SWR METER
Dual needle meter displays FOWARD and REFLECTED Power in Watts.
The SWR in measured where the two needles intersect on the red scale.
3. ANTENNA
Continuously adjustable output capacitor.
4. OUTPUT SELECT
Eight-position rotary switch an output coaxial connector.
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VC-300D Digital Bargraph Antenna Tuner Owner's Manual
DIRECT MODE:
DMY LOAD selects the internal dummy load, bypassing the impedance
•
matching circuit but providing normal meter readings.
BYP selects the BYPASS connector on the rear panel, bypassing the
•
impedance matching circuit but providing normal meter readings.
COAX 1 selects the COAX 1 connector, bypassing the impedance matching
•
circuit but providing normal meter readings.
COAX 2 selects the COAX 2 connector, bypassing the impedance matching
•
circuit but providing normal meter readings.
TUNED MODE:
COAX 2 selects the COAX 2 connector through the impedance matching
•
circuit.
COAX 1 selects the COAX 1 connector through the impedance matching
•
circuit.
WIRE selects the WIRE connector through the impedance matching circuit.
•
DMY LOAD selects the internal dummy load through the impedance matching
•
circuit.
5. INDUCTOR
12-position rotary switch to vary inductance.
6. RANGE
Two-position push button switch selects the range of FOWARD and REFLECTED
Power displayed on the power meter.
When the RANGE switch is OUT, the FOWARD meter scale reads 300 watts full
scale and the REFLECTED meter scale reads 60 watts full scal e. When the switch i s
IN, the FOWARD meter scale reads 30 watts full scale and the REFLECTED meter
scale reads 6 watts full scale.
7. LEVEL
When the level control is adjusted to light the red LED at 100% CW power, the
digital bargraph will indicate relative peak on SSB. When this control is turned fully
anticlockwise, the switched position turns off the meter lamps and the digital
bargraph.
8. DELAY
The delay control adjust the rate at which the digital bargraph returns to zero. This
control is set according to the operators discretion.
9. DIGITAL BARGRAPH
20 segment LED bargraph which displays peak power. The right-hand LED is red,
indicating 100% power.
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