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Vectronics VC-300M Owner's Manual

Antenna tuner
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VC-300M Antenna Tuner
Owner's Manual
Vectronics VC-300M Antenna Tuner
FEATURES
The Vectronics VC-300M Antenna Tuner optimizes the performance of your antenna and
transmitter, receiver, or transceiver by providing adjustable impedance matching. The
VC-300M also measures the Power and Standing Wave Ratio (SWR), allowing you to
adjust for the lowest possible ratio for the selected transmit frequency. The VC-300M
utilizes a precision frequency compensated lighted dual movement SWR/Power meter
which can show either peak or average readings.

SPECIFICATIONS

FRONT PANEL INDICATORS
Meter ....................................Dual movement lighted cross needle Power and SWR meter.
FRONT PANEL CONTROLS
TRANSMITTER Tuning .....Continuous rotation capacitor
ANTENNA Tuning ..............Continuous rotation capacitor
INDUCTANCE ....................48 Turn Switched Rotary Inductor
RANGE ................................2 position switch: 30W/300W
METER ................................2 position switch: PEAK/AVG
LAMP...................................2 position switch: ON/OFF
REAR PANEL CONNECTORS
INPUT ..................................SO-239 Connector
OUTPUT ..............................SO-239 Connector
12 V AC/DC.........................2.5 mm Barrel Connector
GROUND.............................Post/Wingnut
OTHER
Frequency Coverage.............1.8-30 MHz
Power....................................150 Watts Continuous; 300 Watts pep, SSB
Dimensions...........................3.6" (92 mm) H x 7.25" (184 mm) W x 8.75" (222 mm) D.
Weight ..................................2.5 lbs. (1.15 kg)
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Summary of Contents for Vectronics VC-300M

  • Page 1: Specifications

    The Vectronics VC-300M Antenna Tuner optimizes the performance of your antenna and transmitter, receiver, or transceiver by providing adjustable impedance matching. The VC-300M also measures the Power and Standing Wave Ratio (SWR), allowing you to adjust for the lowest possible ratio for the selected transmit frequency. The VC-300M utilizes a precision frequency compensated lighted dual movement SWR/Power meter which can show either peak or average readings.

  • Page 2: Contols / Connectors

    VC-300M Antenna Tuner Owner's Manual 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.

  • Page 3: Rear Panel Connectors

    If any damage is apparent, notify the transportation carrier or dealer immediately. We recommend keeping the packing carton for moving, storage, or reshipping the tuner. Select a location for the VC-300M that allows the connectors to be free of any possible contact during operation.
  • Page 4 3. Begin tuning with your transmitter set at a low output setting (10 to 20W). WARNING: Do not operate the VC-300M with the cover off! Do not change the inductor switch with more than 20 watts of applied power! TUNING 1.
  • Page 5 Owner's Manual 4. If you use a linear amplifier, set it to STANDBY. Do not use the linear amplifier until the VC-300M is tuned. Do not exceed 300 watts! 5. Set RANGE switch to 30W (button IN). 6. Rotate the TRANSMITTER, ANTENNA, and INDUCTOR controls for maximum noise or signal as heard on your receiver.

  • Page 6: Meter Calibration Procedure

    VC-300M Antenna Tuner Owner's Manual METER CALIBRATION METER CALIBRATION PROCEDURE Connect transceiver to TRANSMITTER IN connector. Connect external 50 load to ANTENNA connector. Set the RANGE button to 300W. Apply 100W of RF at 14.0 MHz. Adjust R1 (see Figure 1) so that 100W of FORWARD power is read on the meter.

  • Page 7: Schematic Diagram

    VC-300M Antenna Tuner Owner's Manual SCHEMATIC DIAGRAM MODEL VC-300M...

  • Page 8: Technical Assistance

    If the manual does not reference your problem or your problem is not solved by reading the manual you may call VECTRONICS at 601-323-5800. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.

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