AMERITRON AL-811HD Buku Petunjuk - Halaman 3
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FEATURES
The AL-811HD is a grounded grid linear amplifier developed
by Ameritron using low cost 572B power triodes. It operates in
class AB2 for SSB and CW.
1. Fast Warm Up Time: The 572B tubes take approximately
10 seconds to warm-up.
2. Long Tube Life: The 572B tubes are long life, reliable
transmitting tubes.
operation even on RTTY and SSTV.
3. Tuned Input:
A Pi-Network tuned input matches the
572B tubes to 50 ohm exciters.
4. Two Illuminated Panel Meters: The AL-811HD has two
illuminated panel meters. The Grid Current meter provides
a continuous reading of the grid current to indicate proper
loading of the amplifier. The other meter switches between
high Voltage (HV) and Plate Current (Ip).
5. Multi-voltage Heavy Duty Transformer:
"buck-boost" winding allows adjustment of primary
voltages to match a wide range of line voltages centered on
110 and 230 volts. This versatile Ameritron feature allows
the user to maintain optimum voltages on the tubes and
other components to obtain maximum performance and life.
6. Vernier Plate and Load Adjustments:
controls have vernier 6:1 reduction drives for smooth
tuning logging scales for accurate and rapid tune-up.
7. Safety interlock: AC input power is removed from the
transformer when the cover is removed. Never attempt to
defeat this switch.
8. Operate/Standby Switch: Used to remove the amplifier
from the RF line while filament and plate voltages are
maintained during "barefoot" operation.
9. XMT Indicator LED: Provides a front panel indication of
proper amplifier keying by the exciter.
10. ALC: The drive level is detected to provide a control
voltage for the exciter. ALC prevents over-driving of the
linear and reduces distortion from excessive drive power.
11. Neutralization Circuit: Reduces unwanted feedback to
improve performance.
12. Grid Overload Protection: Amplifier goes into Stand-by
when too much grid current is achieved.
CAUTION:
This amplifier must be disconnected from
the power mains before removing the cover. See the
precaution on page 7.
AL-811HD LINEAR AMPLIFIER
572B tubes offer rugged, reliable
Both tuning
TECHNICAL SPECIFICATION AL-811HD *
Frequency Coverage
Domestic model (AL-811HD): 160, 80, 40, 30, 20, 17 and 15
Export model (AL-811HDX/HDY): 160, 80, 40, 30, 20, 17, 15,
Input
Circuit type: Pi-network, slug tuned coils
Maximum VSWR at resonance: 1.3:1
Minimum 2:1 VSWR bandwidth: 15%
Maximum drive power permissible: 85 watts
Typical drive for rated output: 65 watts
Output (7MHz)
Typical SSB PEP voice operation: over 800 watts continuous
Typical CW continuous operation: 600 watts
1/2 hour PEP two tone: 800 watts
1/2 hour continuous carrier: 600 watts
A unique
ALC
Negative going, 0-12V, adjustable, phono jack
Power Supply
Circuit type: full wave bridge rectifier
No load voltage: 1700V
Full load voltage: 1500V
Full load current: 700mA
Regulation: 15%
Maximum draw at rated output: 10A (120V)
AC Input: 120V, 50/60 Hz (AL-811HD/HDY
Metering
Multimeter: reads HV and plate current
Grid meter: reads PA grid current
Connectors
Relay: keys amplifier when grounded. Sources +12 VDC open
RF input: SO-239, 50 ohm input.
RF output: SO-239, 50 ohms with full power, into any SWR
Power: NEMA 5-15P 120V grounded style.
ALC: Phono Jack. Supplies up to 12 volts of negative voltage
for ALC control of exciters.
Physical
Dimensions: 15.5" D x 13.75"W x 8.25"
Weight: 30 lbs.
* Specifications are subject to change without notice or obligation.
Exact performance measurements may vary due to the accuracy of the test
equipment and the measurement methods used.
2
meter bands
12, and 10 meter bands.
240V, 50/60 Hz (AL-811HDX)
circuit and supplies 100mA when grounded. A built-in
pulse canceling diode protects the exciter.
below 3:1.