Page 5
DU 3000 Antenna Tuner
Control knobs and Connectors
Front Panel Functions (Refer to page 3)
1. OUTPUT (Antenna)
Continously adjustable output capacitor
2. POWER/SWR METER
Dual needle meter displays FORWARD and REFLECTED Power in Watts.
The SWR in measured where the two needles intersect on the red scale.
3. INPUT (Transmitter)
Continuously adjustable input capacitor.
4. DIRECT-TUNED OUTPUT SELECTOR
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 matchi
circuit.
3. DIRECT BYPASS selects BYPASS COAX connector by passing the
impedance 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 providing SWR, 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 2 connector through the
impedance matching circuit.
5. POWER RANGE SWITCH
Two-position switch selects the range (300 W or 3 kW) of FORWARD and
REFLECTED Power displayed on the power meter.
When the METER (power range) switch selects 300 W the FORWARD meter scale
reads 300 W at full scale and the REFLECTED meter scale reads 40 W at full scale.
When the METER switch selects 3 kW, the FORWARD meter scale reads 3 kW at
full scale and the REFLECTED meter scale reads 400 W at full scale.
6. INDUCTOR Ceramic body
