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.
Fast Warm Up Times:
The 811A tubes take approximately 3 seconds to warm-up.
Long Tube Life:
The 811A tubes are long life, reliable transmitting tubes. 811A tubes offer rugged, reliable operation even on RTTY and SSTV.
Tuned Input:
A Pi-Network tuned input matches the 811A to 50 ohm exciters.
Two Illuminated Panel Meters:
The AL-811 has two illuminated panel meters. The Grid Current meter provides a continuous reading of the 811 grid current to indicate proper loading of the amplifer. The other meter switches between high Voltage (HV) and Plate Current (Ip).
Safety Interlock:
Removes AC from the unit when the cover is removed. Never attempt to defeat this switch.
Operate/Standby Switch:
Unsed to remove the amplifier from the RF line while filament and plate voltages are maintained for "barefoot operation".
XMT Indicator LED:
Provides a front panel indication of proper amplifier keying by the eciter during operation.
ALC Voltage:
The edrive level is detected to provide a negative control voltage for the exciter. ALC preevents overdriving the linear and reduces distortion from excessive drive power.
CAUTION:
This amplifier must be disconnected from the power mains before removing the cover.Frequency Coverage
Domestic model (AL-811): 160, 80, 40, 30, 20, 17 and 15 meter bands.
Input
Circuit type: Pi-Network, slug tuned coils
Maximum VWSR at resonance: 3.1:1
Minimum 2:1 VSWR bandwidth: 15%
Maximum drive power permissible: 100 watts
Typical drive for rated output: 75 watts
Output
Curcuit 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: 550 mA
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 ohmm input.
RF output: SO-239, 50 ohms needed with full power, will load into any SWR below 3:1 at recuced power output.
Power: NEMA 15-15P 120V gpimded style.
Physical
Dimensions: 16" D x 13 3/4" W x 8"
Weigh: 30 lbs.