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What has the author Ronald D Armstrong written?
Ronald D. Armstrong has written: 'A method for determining the maximum number of nonoverlapping linear test forms that can be assembled from an item pool' -- subject(s): Examinations, Computer adaptive testing, Design and construction
What is indirect method of FM transmitter?
indirect FM transmitter is the transmitter which indirected connectly to the FMINDIRECT FM GENERATIONWhile it is not possible to vary the frequency of a crystal oscillator directly, it is possible to vary its phase. The resulting PM signal can be used to create FM. This is the basis of the Armstrong modulator.The mathematics required to analyze the Armstrong modulator completely are complex, so we will discuss only the basic circuit operation. An audio signal is passed through a preemphasis network and then an integrator, a special network whose output is the time integral of the input signal. The preemphasized integrated signal is used to phase modulate a crystal oscillator. Mathematically, it can be shown that PM using the integral of the audio signal is identical to FM using the audio signal itself. In this way an FM signal is generated.The Armstrong modulator cannot produce much deviation, so combination of multipliers and mixers are used to raise the carrier frequency and the deviation. The multipliers are used to multiply the carrier and the deviation. The mixers are used to decrease the carrier, while keeping the deviation constant so that additional multiplier stages can be used to obtain more deviation. It is worth going through an example:An FM station is authorized to operate at 90.9 MHz, with maximum deviation of 75 KHz. The FM signal is generated with an Armstrong modulator whose output is 500 KHz with a deviation of 15.432 Hz. The modulator output is applied to 3 triplers and a doubler to obtain a frequency of 81 MHz and a deviation of 2.5 KHz. The 81 MHz signal is mixed with a 77.97 MHz signal to produce a 3.03 MHz signal whose deviation is still 2.5 KHz. This signal is fed through a doubler, tripler and quintupler to multiply the carrier to 90.9 MHz and the deviation to 75 KHz.
What is direct FM generation?
direct fm generation is a method of generation of fm signal directly with the help of parameter variation method. in this method we use some of the devices which converts the variation in voltage to variation in frequency such as varactor diode.
Frequency modulation direct and indirect FM generation method?
I know the answer,but I just can reply it in Chinese.
What method was used to pass down myths from generation to generation?
Myths were typically passed down orally through storytelling. In many cultures, storytellers would memorize and recite myths to preserve them and pass them on to the next generation. Some myths were also depicted in art, music, dance, or written texts to help with their preservation and transmission.
What two words describe the method of passing down stories from one generation to the next?
Oral histories.
What is the Type of antimicrobial agent of ciprofloxacin?
Second-generation cephalosporins. Method of action: inhibit cell wall systhesis
Which method of income generation will most likely help Roger achieve his goal?
Getting a full time summer job
Why is tidal energy non conventional?
Because it has not been harnessed to any extent; it is not historically a conventional method of power generation.
What is a safe floor cleaner for pets?
Method products are good. Simple Green. Seventh Generation. Any of the natural cleaners should be fine.
What did Neil Armstrong leave on the moon?
Neil Armstrong discovered that he could walk on the moon for over 2 hours in his spacesuit. And that the moon had an extremely high temperature, which required cooling of their bodies with water. He also managed to plant the American flag.
Which method was used to pass down myths from generation to generation?
Myths were typically passed down from generation to generation through oral storytelling. In many cultures, trained storytellers would memorize and recite myths to keep them alive and preserve their cultural significance. This tradition helped ensure that myths were shared and remembered by community members through verbal communication.
