This is an old revision of the document!
Hercules II Model 420
Specifications
Operating Frequency Range: General coverage 1.6 to 22.000 MHz. Modification for 22.000 to 30.000 MHz is available for authorized users.Coverage is in seven bands which are front panel or rear panel remote selectable.
RF Power: 1000 watts input. 500/600 watts output, depending on frequency and load impedance.
Drive Power: 65 to 80 watts typical for 500 watts output.
Distortion: -35 dB from 500 watt output level.
Harmonics: -50 dB typical.
Input and Output Impedance: 50 0hms unbalanced, < 2:1 SWR
Cooling: Internal forced air, rear panel exhaust.
Metering: Switch selectable forward power, SWR, Icc (collector current) and Vcc (Voltage). Ten element LED bar graph displays peak output power.
Primary Power: RF deck, 12 to 14 volts at 100 amps, maximum.
TX/RX Switching Time: 10 ms or less.
Duty Cycle: 100% typical Amateur service. 10 minutes maximum continuous key-down at 500 watts output.
Final Amplifier Transistors.' Eight MRF458, or equivalent.
Protective Circuits: Over-voltage and overcurrent lockout. Front panel "OVERDRIVE" light.
Front Panel Controls: Multi-meter control switch. power on-off switch and band select switch.
Rear Panel Connections: RF in, RF out, DC input. TX/RX control jacks and remote control socket.
Size: HWD 5.25" x 12" x 14. 5".
Weight 15 lbs.
