AMERITRON AL-80B, Инструкция по эксплуатации

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AL-80B Instruction Manual
1
Features
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The AL-80B uses a rugged, inexpensive 3-500Z tube.
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The 3-500Z requires only a few seconds of warm-up time.
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A dynamic bias circuit eliminates hundreds of watts of unnecessary heat generation in the
power amplifier tube. The result is cooler operation and longer component life.
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A multi-voltage heavy-duty transformer with a unique "buck-boost" winding allows
adjustment of the primary voltage to 14 different voltages centered on 115 and 230 Vac. This
versatile Ameritron feature allows the user to select the optimum primary voltage for maximum
performance and life.
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The tuning and loading controls have vernier 6:1 reduction drives for smooth tuning.
Logging scales allow quick and repeatable control adjustments for rapid band changes.
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The AL-80B has two illuminated cross-needle panel meters . The left meter provides a
continuous reading of grid and plate currents. The right meter indicates peak RF power output
on one scale and Plate Voltage (HV), Reflected power and SWR (REF), ALC detector voltage
(ALC), and ALC adjustment level (ALC SET) on the other.
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Filament and plate voltages are maintained using the "STBY/OPR" switch. This allows the
amplifier to be conveniently bypassed for "barefoot" operation.
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A front panel "ALC SET" control allows convenient adjustment of the ALC threshold. The
unique ALC circuit samples the grid current and power supply voltage.
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An "XMT" LED on the front panel indicates proper keying of the amplifier by the exciter.
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A rear panel "12 V" auxiliary output jack provides up to 200 mA at 12 Vdc for accessories
such as the ATR-15 Antenna Tuner.
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A step-start circuit limits the inrush current to the power supply and tube filament. This circuit
extends the life of the amplifier components.