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VC-300DLP Antenna Tuner Owner's Manual

VECTRONICS

VC-300DLP Antenna Tuner

FEATURES

The Vectronics VC-300DLP Antenna Tuner optimizes the performance of your antenna and

transmitter, receiver, or transceiver by providing adjustable impedance matching. The VC-

300DLP 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-300DLP 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 circuit.

SPECIFICATIONS

FRONT PANEL INDICATORS

Meter ..................................... Dual movement lighted cross needle Power and SWR meter.

FRONT PANEL CONTROLS

TRANSMITTER................... Continuous rotation capacitor.

ANTENNA............................ Continuous rotation capacitor.

INDUCTANCE..................... 48 Turn Switched Rotary Inductor.

OUTPUT SELECT ............... Eight position: DIRECT Coax 1, Coax 2, Bypass, and Dummy

Load; TUNED Coax 1, Coax 2, Wire, and Dummy Load.

RANGE ................................ 2 position switch: 30W / 300W

METER ................................. 2 position switch: PEAK/AVG

LAMP.................................... 2 position switch: ON / OFF

REAR PANEL CONNECTORS

COAX 1................................. SO-239 Connector

COAX 2................................. SO-239 Connector

BYPASS................................ SO-239 Connector

TRANSMITTER IN.............. SO-239 Connector

BALANCED LINE ............... Dual Banana Jack

WIRE..................................... Banana Jack

Summary of content (9 pages)

PAGE 1
VC-300DLP Antenna Tuner Owner's Manual VECTRONICS VC-300DLP Antenna Tuner FEATURES The Vectronics VC-300DLP Antenna Tuner optimizes the performance of your antenna and transmitter, receiver, or transceiver by providing adjustable impedance matching. The VC300DLP also measures the Power and Standing Wave Ratio (SWR), allowing you to adjust for the lowest possible ratio for the selected transmit frequency.
PAGE 2
VC-300DLP Antenna Tuner Owner's Manual OTHER Frequency Coverage.............. 1.8 - 30 MHz Power..................................... 150 watts Continuous; 300 watts pep, SSB Dimensions............................ 3.5" (89mm) H x 10.2" (266mm) W x 9.4" (240mm) D. Weight ................................... 3.6 lbs. (1.6 kg.) CONTROLS / CONNECTORS FRONT PANEL FUNCTIONS 1. TRANSMITTER Continuously adjustable input capacitor. 2.
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VC-300DLP Antenna Tuner Owner's Manual COAX 2 selects the COAX 2 Connector, bypassing the impedance matching circuit but providing normal meter readings. TUNED MODE COAX 1 selects the COAX 1 connector through the impedance matching circuit. COAX 2 selects the COAX 2 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.
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VC-300DLP Antenna Tuner Owner's Manual 3. COAX 2 Coaxial connector for output to Antenna Two. 4. BYPASS Coaxial connector for third coax output. Bypasses tuner, but meter circuits remain active. 5. GROUND Post / Wing-nut type ground connector. 6. BALANCE OUTPUT Two banana jack connectors for output to RF balanced twin lead antennas. (Note that jumper must be used as shown by the dotted line. 7. END FED WIRE Banana jack for output to a single-wire antenna. (Do not use jumper.) 8.
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VC-300DLP Antenna Tuner Owner's Manual 5. Connect any antenna that does not require the use of a tuner to the BYPASS (4) connector using a coax cable. this allows you to select this antenna from the OUTPUT SELECTOR switch. 6. To avoid possible damage to the VC-300DLP, set the TRANSMITTER, ANTENNA, and RANGE switches as outlined in the next section before applying transmitter power. 7. Begin tuning with your transmitter set at a low output power setting (10 to 20 W).
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VC-300DLP Antenna Tuner Owner's Manual 5. Set OUTPUT SELECTOR switch to the proper selection on the TUNED side of the switch. Selecting any of the DIRECT positions by passes the tuning circuitry altogether. 6. Rotate the TRANSMITTER, ANTENNA, and INDUCTOR controls for maximum noise or signal as heard on your receiver. 7. Key your transmitter and adjust the power level for a reading of 40-50 watts on the FORWARD scale.
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VC-300DLP Antenna Tuner Owner's Manual TECHNICAL ASSISTANCE If you have any problem with this unit first check the appropriate section of this manual. 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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VC-300DLP Antenna Tuner Owner's Manual METER CALIBRATION METER CALIBRATION PROCEDURE • • • • • • • • • • • • • 8 Connect transceiver to TRANSMITTER IN connector. Connect external 50 Ω load to COAX 2 connector. Set the OUTPUT SELECT switch to the COAX 2 DIRECT position. Set the RANGE button to 300 W and the PEAK/AVG button to AVG. Apply 100 W of RF at 14.0 MHz. Adjust R1 (see Figure 1) so that 100 W of FORWARD power is read on the meter. Reduce the RF power to 10 W and set the RANGE to10 W.
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VC-300DLP Antenna Tuner Owner's Manual SCHEMATIC DIAGRAM VC-300DLP 9