2.1 MHz to 3.6 MHz M.O.P.A. (Master Oscillator Power Amplifier)
1930s/1950s M.O.P.A. Oscillator Replica. When connected to the GB-4000
it is capable of outputting 8 Frequencies Simultaneously.
The M.O.P.A. amplifier uses the gas filled tube radiant method of outputting frequencies. Many people ask what
are the benefits of the M.O.P.A. over the SR-4 amplifier? First: the M.O.P.A. uses the gas filled tube method which
is a non-contact method. The gas filled tube method allows for a greater power output of 90 watts compared to
the SR-4's 10 watt contact method. Second: the M.O.P.A., for the first time since the 1930s, allows for the use of
high frequencies directly output through the gas filled tube method. This has been a long sought after feature
that many have been asking for. If you are wanting to use the more powerful, versatile 1930s/1950s radiant
method, then the M.O.P.A. amplifier is the instrument you will want to own.
When it comes to power the GB-4000, SR-4 and M.O.P.A. should be considered as good, better and best. If your
budget only allows for the GB-4000 then you have the one of the best frequency generators you can purchase.
If your buget allows for the GB-4000 and SR-4 amplifier then you move up to the next level of performance. If you
can afford the GB-4000 and M.O.P.A. amplifier then you know you have the very best gas filled tube system on
the market today which has both contact and radiant capabilities. You also have the only system that can output
both the 1930s/1950s frequencies through a gas filled tube. Only purchase what you can afford because you
can always add the SR-4 or M.O.P.A. amplifier at a later date.
| (View Our Printable Brochure) |
The M.O.P.A. Amplifier/Oscillator Technical Specifications and Features........
- Fabrication: Built by hand and tested for quality assurance with one year *limited 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 (1128 volts).
- Amplification current : Low current (30 to 140 milliamps).
- Vacuum tube vs Solid state amplification: Modern solid state uses low voltage and
high current designs. The M.O.P.A. uses the high voltage low current design.
- Milliamp meter: Built in.
- Waveform: Sine wave.
- Sine wave: Analog.
- Carrier frequency: Variable.
- Carrier frequency range: Approximately 2.1 MHz to about 3.6 MHz. Once the carrier frequency is set
using the frequency counter the carrier frequency will stay on that carrier frequency until it is changed
to a new carrier frequency. It is not necessary to adjust the carrier frequency when running any audio
frequencies because it will stay on that carrier frequency.
- Carrier frequency tuning: Variable tuning capacitor.
- Power output: Variable average un-modulated power with a maximum of approximately 90 watts
at 140 milliamps.
- Peak power: When gated or modulated, approximately 360 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 a BNC connection.
- Frequency output modulation: GB-4000 audio frequencies up to 40,000 hertz square wave
@ 100% AM modulation.
- Maximum frequencies output: When connected to the GB4000 it can transmit up to 8
frequencies simultaneously.
- Gating or pulsing: 1 to 40,000 hertz using the GB-4000.
- Frequency delivery: Gas tube (*Sold by another company. Limited warranty applies only if
another type of gas tube is used, then there is no warranty)
- Gas tube ignition: Instantaneous.
- SWR meter: None. Gas tube is connected directly to the RF tank coil requiring no SWR
(standing wave ratio) meter. This method, unlike the SWR meter systems, delivers almost 100%
power output to and through the plasma tube.
- Useful range of about 30 feet when using gas tube. Due to the laws of physics there are
limitations to gas filled tubes and metal antennas that need to be understood. Both are very
efficient and about 100% of the energy that you put into them comes out. But for every foot
that you move away from these antennas you lose 75% of the power they output. To illustrate
we will use the standard loss with metal antennas as the power loss ratio for a gas tube.
With a 50 watt output at one foot away from the gas filled tube you will only get 12.5 watts. At
two feet away you only have 3.125 watts and at 3 feet you only have about 0.78 of a watt.
Because of the law of physics it is important to be as close to the gas filled tube as you can get
if you want the greatest amount of the energy that comes out of it. Three to six feet distance
away from the gas tube would not be the best choice.
- Suggested range: 1 inch to 5 feet when using gas tube. Because there is no 1 foot to 3 foot null
zone (non-effective range) it is not necessary to stay 3 to 6 feet away from the gas tube because
it outputs the same as the 1930s/1950s equipment that was used within 6 inches of the target area.
- Size: Compact design - 10.5" Wide X 17" Long X 10" High.
- Power used: Can be built for use with 110/120 volts AC or 220/240 volts AC.
- Power usage: 150 watts. When connected to the GB-4000 175 watts.
- Weight: 19 pounds.
- (Please note: gas filled tube including copper collars with wire and gas tube holder sold separately
from another company for $265.00 plus shipping. Your distributor can give you the phone number
for that company so you can order it when you order your M.O.P.A. This gas tube is made of
Pyrex and is a 2" inch round by 14" inch long Helium, Argon or Helium/Argon filled tube. It is
guaranteed to handle the power output of the M.O.P.A. (*The M.O.P.A. comes with a one year warranty
but if any other plasma tube is used there is no warranty)
- For those who already own a GB-4000, the M.O.P.A. is priced at $2720.00. This price includes shipping
in the USA and the F-2800 Elenco frequency counter. ($500 restocking fee on M.O.P.A. only)
- The M.O.P.A. with GB-4000 is priced at $4445.00 and includes shipping in the USA.
All products sold by AAA Production come with a one year parts and labor warranty and free
technical support for as long as you own your instruments. See your distributor to purchase
a GB-4000, SR-4 amplifier or a M.O.P.A. amplifier/oscillator.
|
RF vs EM Systems
(*EM) All gas tube instruments that are EM (electro-magnetic) do not use RF (radio frequency)
frequencies or an RF carrier frequency. They use coils to produce a high electromagnetic field to carry
the frequencies to the target. Due to the fact that they use EM to deliver the frequencies they are limited
to about 10,000 Hertz but a few go to 30,000 Hertz. Since they do not use an RF carrier frequency it is almost
impossible to determine their power output. For this reason almost none of these manufacturers list the power
output of their equipment. They generally are very good instruments except for their limited frequency range.
Anyone who purchases the EM type of equipment should understand that they only output low audio
frequencies and have no RF carrier frequency. All the original 1920s through the 1950s instruments
used RF and had an average power output from about 40 to about 200 watts.
GB4000 with M.O.P.A. Amplifier
 |
M.O.P.A. Vacuum tube amplifier.
90 watts output.
 |
We supply the Elenco F-2800 Frequency Counter to properly read your M.O.P.A. Frequency Amplifier.
Image shown below.
Since the new M.O.P.A. Oscillator/Amplifier uses an old style variable tuning capacitor, it is necessary to have a frequency counter so you can set the carrier frequency of the M.O.P.A. to whatever carrier frequency you want to use from 2.1 MHz to 3.6 MHz. Once the carrier frequency is set the carrier will stay on that frequency and will only wander a small amount. This wandering was considered a good thing because it creates a small sweep in the carrier frequency. Once the carrier is set it is not necessary to adjust it when running any audio frequencies. When running multiple audo frequencies the frequency counter cannot read the carrier frequency. For this reason we have created an instructional DVD which gives complete directions on how to set the carrier fequency. The Frequency counter is now supplied with the purchase of the M.O.P.A. Amplifier.
|
 |