7
2 TECHNICAL SPECIFICATIONS
FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands:
1.800 – 1.900 MHz
3.500 – 4.000 MHz
7.000 – 7.500 MHz
10.000 – 10.300 MHz
14.000 – 14.350 MHz
18.000 – 18.500 MHz
21.000 – 21.500 MHz
24.000 – 24.500 MHz
28.500 – 29.990 MHz
TRANSMITTING MODES: Both continuous and low duty cycle modes are supported. That is, the DX-3
supports SSB, CW, AM, FM, RTTY and SSTV. II
OUTPUT POWER: Typical 3000 watts carrier or up to 4000 W PEP
DRIVE POWER: Nominal 60-90 watts for full rated output.
INPUT IMPEDANCE: Nominal 50 ohm passive impedance, unbalanced. VSWR 1.4:1 or less.
OUTPUT IMPEDANCE: Nominal 50 ohm passive impedance, unbalanced. VSWR 2.6:1 or less.
DISTORTION: Third order intermodulation products are more than 35 dB below rated output.
HARMONICS: Harmonic output is better than 50dB below the rated output.
FAULT PROTECTION: The comprehensive fault protection system include circuitry to monitor:
• plate current: should the plate current exceed a safe value, the amplifier goes to standby mode for 2
minutes.
• screen grid over-current: Absolute tube protection is offered with visual warning and a reduced power
level being enabled if the screen current exceeds a pre-set limit.
• temperature: Should the tube's temperature exceed a specific level, amplifier operation is suspended
until the temperature drops to a safe level.
• Flash-over: a 3-stage protection circuit using extremely fast MOV’s protects the screen regulator from
the dangerous plate voltage in case of a flash-over in the tube.
OPERATIONAL PROTECTION
• Overdrive protection: Should the DX-3 be overdriven, a LED warning indictor will light up when the
linearity limit is reached. If the drive is increased further, a 2 second cut off (by-pass) will follow.
• SWR protection: Should the DX-3 sense an SWR exceeding 2.6:1, a LED warning indicator will light
up, simultaneously with a 3 second cut off.
METERING: The front panel moving LED display systems indicate:
“Moving light” LED indicators:
• output power
• reflected power
• screen grid current
• plate voltage
• plate current
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