【 Weak current College 】 meeting system common questions

1. I can simultaneously use the same frequency as the two branches of the microphone?
Cannot be used at the same time. Wireless transmission cannot be mixed in the air "," even in the same frequency, the receiver cannot blend two send signals. For example, two FM radio station in the same frequency on-the-air, this is not possible. Since this can cause confusion, result in distorted audio. All in all, each wireless transmitter should have a separate sink their own frequency.
2. wireless microphone and the difference of frequency in order to avoid interference?
Depending on the circumstances, but should at least be 4MHz. Here we are not able to clearly answer the question, since it involves complex calculations. In General, less expensive wireless system frequency gap is larger, because of their simple design of the receiver, select. This limits the number of channels are compatible. Price higher system, filtering of better, closer to the distance between channel, compatible channel correspondingly increased. If we say "you do not want to own calculation", we say Yes. If you need, contact the manufacturer or vendor, they will help you calculate. Most manufacturers have already calculated the Shure's each wireless frequency characteristics of compatible, so you do not need to do the tedious mathematical calculations.
3.UHF over VHF, right?
For wireless microphone of the two frequency section of both advantages and disadvantages of each. This is determined by frequency of use, frequency of physical characteristics, and the band of limits.
The following is superior to VHF UHF several aspects:
· VHF UHF band "is not crowded."
· Frequency Agile UHF using a wider range.
· UHF characteristics to provide more compatible system. [E.g., Shure LX and SC (VHF-band) system only provides 12 compatible channel, and Shure in the UHF band system provides more than 100 compatible channel. ]
· Power output of UHF system than VHF, frequency shift broader, better dynamic range, s/n ratio is superior to the VHF.
UHF VHF over several aspects:
1.VHF system cheaper prices.
2.VHF for a specified transmission power, emission greater scope.
3.VHF signal propagation, even through non-metallic substances. VHF wavelength longer, not easy to be absorbed by the human body.
4.UHF system can be used with compatible VHF system?
You can even use VHF system compatible with the maximum number, also be compatible with UHF. (But not the VHF UHF receiver current VHF antenna would, or VHF antenna splitter distribution amplifier connected).
5. the projector maintenance
In the course of using the projector, one of the most important is to maintain good heat dissipation. Projector has two power switch, a soft switch (POWER button), the other is a hard switch (power switch on the SWITCH). After the end of the projector used, first press the soft switch (POWER button) to turn off the projector, in fact at this point the projector does not really work in the end, on one side of the cooling fan is still running, because the projector in the work of the great bulk of heat, so manufacturers have designed three-to five-minute thermal process. If you turn off the projector internal heat cannot discharge, will burn liquid crystal panels or bulb. On rotation, such as fan stops before you can turn off hard switch. General on the projector in continuous use for four, five hours later, you should close it and let it rest. This may extend the bulb and the life of the LCD Panel. Don't show rocked the projector.
6. the projector screen colors and display different colors
When the projector screen colors and colors on the monitor is not at the same time, it may not connect the VGA connector or internal off a certain color of connector and the other possible LCD panels burn out.
7. the projector in some characters appear on the screen does not fully
When the projector in some characters appear on the screen does not fully, it is possible that some projector resolution is insufficient, incomplete character graphics display, you can reduce the resolution of the computer will not be displayed completely, if not, then three LCD tablets have a burned.
8. the projector appear dark yellow or color not full
If the projector is dark yellow, the color is brilliant. Lamp life has the potential to replace the lamp (it is worth noting that after the change to reset the lamp usage time, a new bulb by old time calculations are easy to aging.