2
AL-811 LINEAR AMPLIFIER
FEATURES
The AL-811 is a grounded grid linear amplifier
developed by Ameritron using low cost 811A power
triodes. It operates in class AB2 for SSB and CW.
1. Fast Warm Up Time: The 811A tubes take
approximately 3 seconds to warm-up.
2. Long Tube Life: The 811A tubes are long life,
reliable transmitting tubes. 811A tubes offer
rugged, reliable operation even on RTTY and
SSTV
3. Tuned Input: A Pi-Network tuned input
matches the 811A tubes to 50 ohm exciters.
4. Two Illuminated Panel Meters: The AL-811
has two illuminated panel meters. The Grid
Current meter provides a continuous reading of
the 811A grid current to indicate proper loading
of the amplifier. The other meter switches
between high Voltage (HV) and Plate Current
(Ip).
5. Safety Interlock: Removes AC from the unit
when the cover is removed. Never attempt to
defeat this switch.
6. Operate/Standby Switch: Used to remove the
amplifier from the RF line while filament and
plate voltages are maintained for "barefoot"
operation.
7. XMT Indicator LED: Provides a front panel
indication of proper amplifier keying by the
exciter during operation.
8. ALC Voltage: The drive level is detected to
provide a negative control voltage for the exciter.
ALC prevents overdriving of the linear and
reduces distortion from excessive drive power.
CAUTION: This amplifier must be disconnected
from the power mains before removing the cover.
See the precaution on page 7.
TECHNICAL SPECIFICATION AL-811
*
Frequency Coverage
Domestic model(AL-811): 160, 80, 40, 30, 20, 17
and 15 meter bands
Export model(AL-811X): 160, 80, 40, 30, 20, 17, 12
and 10 meter bands.
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: 100 watts
Typical drive for rated output: 75 watts
Output
Circuit type: Pi-Network
1/2 hour carrier: 400 watts
30 second carrier: 550 watts
1/2 hour PEP two tone: 600 watts
30 seconds PEP two tone: 600 watts
Efficiency: typically 65%
Power Supply
Circuit type: full wave bridge
Full load current: 550mA
Regulation: 12%
Maximum draw at rated output: 8A
Metering
Multimeter: reads HV and plate current
Grid meter: reads PA grid current
Connectors
Relay: keys amplifier when grounded. Sources +12
VDC open circuit and supplies 100mA when
grounded. A built-in pulse canceling diode
protects the exciter.
RF input: SO-239, 50 ohm input.
RF output: SO-239, 50 ohms needed with full power,
will load into any SWR below 3:1 at
reduced power output.
Power: NEMA 15-15P 120V grounded style.
Physical
Dimensions: 16" D x 13 ¾" W x 8"
Weight: 30 lbs.
*
specifications are subject to change without notice or obligation
(13 pages)
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