New - 2012 M.O.P.A.
Master Oscillator Power Amplifier
1930's to 1950's Equipment Replica
with Updated Advanced Technology that
Exceeds All Other Gas Tube Instruments.

The M.O.P.A. Amplifier (Master Oscillator Power Amplifier) provides a variable 2.1 MHz to 3.6 MHz frequency oscillation with low frequency pulsation from the GB-4000 function generator. This is a new and updated version of the 1930-1950 MOPA original. When connected to the GB-4000, the MOPA is capable of outputting 8 frequencies simultaneously.

Features of the M.O.P.A. Amplifier (Master Oscillator Power Amplifier):

• The MOPA is a high voltage (1160 volts), low current (30 to 140 milliamps) output device as used in the 1930-1950 equipment (modern solid state equipment uses low voltage, high current output)
• Connects to the GB-4000 through regular banana jacks or a BNC connection
• Its sine wave oscillator frequency range covers 2.1 MHz to 3.6 MHz using a variable tuning capacitor
• Average power is 97 watts; peak power when gated or modulated is 388 watts
• Frequencies can be output through a metal or plasma tube antenna
• Amplifier output is analog using the original vacuum tube amplification
• Allows input of GB-4000 audio frequencies up to 40,000 Hz
• Allows any frequency from 2.1 MHz to 3.6 MHz to be used as a stand-alone frequency, or as a carrier wave for square wave audio frequencies input from the GB-4000
• Any frequency from 2.1 MHz to 3.6 MHz can be gated or pulsed using the GB-4000
• Built-in Milliamp meter
• Fabrication: Built by hand and tested for quality assurance
• Warranty: One-year manufacturer's warranty
• Proven design: Solid state combined with vacuum tube technology used for over 80 years
• Amplification method: Original vacuum tube amplification
• Amplification voltage: High voltage (1160 volts)
• Amplification current : Low current (30 to 140 milliamps)
• Vacuum Tube vs Solid State amplification: The MOPA uses high voltage, low current design; modern solid state uses low voltage, high current design
• Waveform: Sine wave
• Sine wave: Analog
• Carrier frequency: Variable
• Carrier frequency range: Approximately 1.1 MHz to about 1.9 MHz.
• Carrier frequency tuning: Variable tuning capacitor
• Power output: Variable average power with a maximum of approximately 60 watts at 140 milliamps
• Peak power: When gated or modulated, approximately 250 watts on the high potential voltage rise on the leading edge of the square wave waveform
• Frequency input method: Designed to work exclusively with the GB-4000 frequency generator through regular banana jacks or a BNC connection
• Frequency output modulation: GB-4000 audio frequencies up to 40,000 Hz square wave @ 100% AM modulation
• Maximum frequencies output: When connected to the GB-4000, it can transmit up to 8 frequencies simultaneously
• Gating or pulsing: 1 to 40,000 Hz using the GB-4000
• Frequency delivery: Metal or plasma tube antenna (sold by another company)
• Tube ignition: instantaneous with no SWR meter needed
• Broadcast range: 1700 feet with useful range of about 30 feet when using a plasma tube antenna
• Suggested range: 1 to 5 feet when using a plasma tube antenna
• Size: Compact design - 10.5" Wide X 17" Long X 10" High
• Power used: 110/120 volts AC
• Power usage: 150 watts
• Weight: 19 pounds

Your MOPA purchase includes a Frequency Counter! It is an Elenco F-2800, which will give you the ability to accurately read and calibrate the exact output frequencies of the MOPA. This Frequency Counter will let you set your frequency of choice between 1.1 MHz and 1.9 MHz.

Please note: The plasma tube is not sold with the MOPA. (However, a plasma tube which is guaranteed to handle the power output of the MOPA can be purchased separately from another company. The plasma tube shown below is made of Pyrex, filled with helium, and measures 2" in diameter and 14" in length. It includes the holder and copper collars with connecting wires. Ask us for the phone number to purchase the plasma tube assembly at the time you place your MOPA order. The cost of the plasma tube is $265.00 plus shipping.)