FEATURES
1. High performance tube: the AL-1500 uses a single rugged
3CX1500A7/8877 tube.
2. High power gain:
the 3CX1500A7/8877 features high
power gain. As little as 65 watts of drive power will pr
vide 1500 watts of output power.
3. SSB/CW switch: the bias voltage is switched to provide
the best linearity on SSB or the lowest dissipation on CW
operation.
proper operation of the amplifier. The other meter reads
Plate Voltage (HV), Plate Current (IP), Peak RF
Watts
(PO) and ALC.
7. Operate/Standby Switch: filament and plate voltages are
maintained while allowing the amplifier to be bypassed
for "barefoot" operation.
8.12 Volt Auxiliary Jack: 12 volts at 100 mA is provided for
accessories such as the ATR-15 Antenna tuner.
4. ALC Indicator: the drive level is detected to provide a
control voltage for the exciter. ALC prevents overdriving
of the linear and reduces distortion from excessive drive
power.
5. Vernier Plate and Load Adjustments: both tuning controls
have vernier 6:1 reduction drives for smooth tuning.
6. Two Illuminated Panel Meters: the AL-1500 has two il-
luminated panel meters. The Grid Current meter provides
a continuous reading of grid current and indicates
9. XMT Indicator LED: provides a front panel indication of
proper amplifier keying by the exciter during operation.
10. Grid Overload Circuit: this amplifier has a circuit that
protects the tube from excessive grid current. If 175 mA of
peak grid current is reached the "OPR" LED will no longer
light and the amplifier will go into a bypass condition. This
overload condition can be reset by momentarily putting the
STBY/OPR switch in the STBY position.
Caution: This amplifier must be disconnected from the power
mains before removing the cover. See the warning on page
10.
TECHNICAL SPECIFICATIONS AL-1500
Input:
Circuit type: Pi-network, slug tuned coils Maximum VSWR
at resonance:
1.3:1
Minimum 2:1 VSWR bandwidth: 20% of
center frequency Maximum drive power permissable: 100
watts Typical drive for full power output:
65
watts
Metering:
Multimeter: Plate current, plate voltage, drive/ALC, power
output (PEP watts)
Grid: Grid current
ALC: Negative going, 0-20V, adjustable, phono jack
Output:
Circuit type: Pi-L, Pi
/2
hour continuous carrier: 1500 watts 30 second
continuous carrier: 2500 watts
1/2 hour PEP two-tone test: 2500 watts plus 30 second
PEP two-tone test: 2500 watts plus
Power Supply:
Circuit type: full wave bridge, capacitor input
No load voltage: 3600 V
Full load voltage: 3300 V
Full load current: 1 amp
Regulation: 10% typical
Transformer: 34 lbs., hypersil
Capacitors: 26 mfd total, computer grade
Maximum draw at rated output: 15 amps at 240V AC 50/60 Hz
Tube:
Type:(1) 3CX1500A7/8877
Continuous dissipation: 1500 Watts
Warm-up time: 180 seconds
Efficiency CW: 65% typical
Efficiency SSB (envelope crest): 62%
MARS/WARC: yes, set to nearest highest amateur band
Keying: Requires relay closure or sinking to ground of
t 12V
DC at 100 mA, phono jack
RF Connectors: S0239
Line Connector: NEMA 6-15P, 240V style
Dimensions: 18
1/2
D x 17 W x 10 H
Weight: 77 lbs.
Frequency Coverage: (AL-1500)-1.8, 3.5, 7, 14, 18 and 21
MHz. User modified models cover 24 and 28 MHz. (AL-
1500X/J) Export models-1.8, 3.5,7, 14, 18, 21, 24 and 28
MHz.
Third Order IMD at Rated Output: -36 dB
