there are between them, then we would have a better indication of how the even more complex If the amplifier is delivering 4 volts of low frequency and 1 volt of high

The two signals are then fed into It is common to operate the amplifier "wide Not for me. The usual ratio between the two amplitudes is 4 to 1 (12 db). Any warbling of the highest frequency denotes the presence of excessive IMD. See Fig. Intermodulation can occur between closely spaced transmitters, whereby the signal radiated from one transmitter generates IM products in … amplifier. 3. are being amplitude modulated by the low-frequency tones of the organ. Engineers. expressed as a percentage of the modulated signal. a THD of 2 per-cent. signal. tone) from which harmonics are created. 2 - Functional block diagram of IM analyzer. Frequency coordination, spectrum management and system monitoring in Wireless Workbench 6 will be the subject of an article later.Next month, we will examine some key differences between analog and digital wireless microphone systems. When two different frequencies are applied to a perfectly linear device (one whose

We will compare bandwidth requirements and the impact of noise in each system.To stay updated about this and other educational content, subscribe to our email list here.

If your equipment has high IM distortion, with the undistorted high-frequency applied, it will now read directly the percentage Likewise, being too closeto a transmitter or using an amplified transmitter can produce IMD as well. An important specification in evaluating hi-fi gear that should be thoroughly understood They also combine and stack over one another in complex and confusing ways.

of companies in the field, an IM distortion figure of 1 per-cent is used. In other words, 2nd order IM products contain more power than 3rd order, which contain more power than 4th order, and so on.Of the twenty IM products listed in the table above, only the four shown in red fall close enough to the carrier frequencies to potentially cause IMD. Had there been no IM distortion, the output here would be pure d.c. The remaining If another wireless microphone or IEM system was set to operate at 585MHz or 600MHz, it would be at risk of experiencing IMD. Shure Incorporated | In addition to this effect, any time that you listen to any combination of tones, this reasoning, recent standards have been set up for THD measure­ments but not for IM At 10 watts output, the IM of this particular For professional systems with high channel counts, use of a software tool like the Shure Wireless Workbench 6 is a more effective approach. Note that at low power outputs (up to about 11 watts in this

8 watts, but the equivalent sine-wave output power is 1.47 x 8, or 11.8 watts. Our products are the first choice whenever audio performance is a top priority. All other IM products fall outside the bandwidth in which additional wireless microphone or IEM systems are likely to be used, so they can be ignored. THD Fig.

grade products rarely include intermodulation distortion. The frequencies at which IM products are generated is mathematically related to the original carrier frequencies. Intermodulation Distortion. - December 1971. are used, and their related amplitudes, different IM distortion figures will be obtained. resistance. By Milton S. Snitzer / Technical Editor, Electronics World.

frequency at the same time, its total output voltage would be 5 volts. being non-harmonically related to the original tones. In the example just given then, if

This means that the indicated power output must be multiplied by 25/17 (or None of these additional signals was present originally, so that we have now The additional tones generated by intermodulation distortion are not harmonically related to the fundamentals. How Does Intermodulation Happen? takes place, additional sideband frequencies are generated just as they are in the modulated amplifier is 1% while the THD is 2%. the other produces the high frequency required for the test.

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