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The ThermoClear systems allows you to treat unwanted imperfections in seconds with minimal discomfort. This radio frequency machine (low and high radio frequency) will help you treat sun spots, age spots, moles, acne scars, injury scars, cholesterol deposits, sebaceous hyperplasia, keratosis, fibromas, skin tags, cherry angiomas and spider capillaries, among others.
The multipolar radio frequency device for face and body RF 3.0 Multipolar guarantees to make your skin smooth and elastic, reduce the ruge, improve and tone the face or body. The first visible results will already be aft...Read more...
The multipolar radio frequency device for face and body RF 3.0 Multipolar guarantees to make your skin smooth and elastic, reduce the ruge, improve and tone the face or body. The first visible results will already be after the first applications. The radio frequency technology is effective and allows to carry out the diathermy procedure through the electromagnetic waves that can sink on the tissues and produce the thermal effect and generate a deep heat which instead stimulates the regeneration of collagen.
The bipolar handpiece emits radio frequency for the face, making the lifting effect very effective thanks to the binary transmission. The surfaces determine an immediate denaturation of the collagen proteins. Treatment is easy, non-invasive and interference-free. The bipolar handpiece has 5 levels of intensity. The three-pole handpiece is used for the body, radiofrequency produces energy that promotes cell regeneration. Thus the skin is young and resistant. The three-pole handpiece has 10 intensity levels.
See, Frequency is the number of waves that pass a fixed point in a unit of time. Using the image above, we can see a more uniform depiction of what the term frequency is describing. The unit of time being used in that image is 1 second. We can see that the frequency represented here is 2 Hertz or 2 Hz. Hertz is the unit used to measure frequency. A Hertz refers to the amount of time it takes a wave to complete one cycle, represented above.
The figure above gives a visual of frequencies at different wavelengths placed on top of each other. Wavelengths are defined as the distance between corresponding points of two consecutive waves; refer to the image below. The wavelength determines how many cycles are possible during a unit of time. The longer the wavelength the lower the frequency and therefore the shorter the wavelength the higher the frequency, depicted moving down the lines.
A radio wave with a higher frequency can more effectively go through walls and is very useful in urban settings, but the shorter wavelengths make it less useful over large distances. This is because the shorter wavelengths will penetrate straight through the atmosphere and continue in a straight fashion.
Radios that use this frequency band work best in open, flat terrain. As you might remember, radios with lower frequencies provide you with a better ability to communicate over long distances. Think back to the AM radio example. The longer wavelengths of a lower frequency radio allow your signal to bend over the horizon to reach your team member miles and miles away.
Likewise, if you are in the middle of downtown Chicago attempting to reach your friend who is working in a high-rise, you may experience some interference with your signal. This static is caused by the lack of signal strength as it attempts to penetrate through the many buildings. It could also be due to signal interference by other two-way radio communications since the longer wavelengths are more easily affected.
People will generally go with UHF radios for indoor use or for when there are obstacles between users. Unlike radios employing VHF, those that use the UHF frequency band are perfect for use in a downtown setting like Chicago. The shorter wavelengths give these radios the power to get your message to your team member with ease. The concrete, glass, and other signal sources bear no match to the penetrating power of a UHF radio system.
UHF radios are ideal for professionals working in areas with densely packed buildings. Think about your security details in buildings or special events, hotel staff, and taxi services navigating the urban environment.
You are a House Manager for a production playing in New York City. You need to have open communication with your assistants and other staff to assure the convenience and safety of all audience members. You would be best served by a UHF radio system as it can navigate the environment you have with ease.
Keep the wavelengths examples in mind. The shorter wavelengths for the higher frequency UHF system will shoot right through the atmosphere, given enough power, meaning it will not bend around the horizon. Think back to the image of the AM/FM/TV waves just above, with the higher frequency, FM, signals continuing through that atmosphere while the AM signal bounced back down to the surface.
These frequency bands are primarily for use by public safety services like police officers, firefighters, and emergency medical technicians, but there are some commercial wireless carriers and private radio systems utilizing them as well.
Many of these organizations utilize a trunked radio system because of their many devices and interdependence needs. More details about trunked radio systems to come, but the picture below will give you a simple visual of a trunked system.
Since the frequency is so high, these systems are very dependent on strategically placed antennas to allow for the large distances needed covering to be communicated over effectively. It is the same problem we face with UHF bands, with more power involved.
Most two-way radios operating in these bands require license agreements. Though 1 license-free option is the DTR700 by Motorola because of its low power usage, at 1-Watt. It is great for retail stores or small businesses in a tightly packed environment.
We have a great article going into more detail about the benefits of different frequency bands here. The article also goes a bit more in-depth about why one should choose a VHF or a UHF two-way radio system.
Your two-way radio system can use a few different methods of transmitting signals based on its programming. We will look at each in order of growing complexity. This section can be a bit dense, so frequent water breaks are recommended.
Below, is an example of a trunked communication system. You can see how a variety of users are able to communicate. None of them are directly transmitting to each other (radio-to-radio); all communications are going through the antenna to the control computer and then redirected out into the field based on the need.
For over a century analog signals ruled the radio world, but the advancement of technology is once again changing things and radio is not immune to the digitization of the modern world. Even though most businesses and users still use analog systems today, the shift to digital systems is coming. A big driving force of this is the analog technology has hit a ceiling with innovations and people are still finding new needs in this ever-changing world.
Most analog radios today utilize frequency modulation, or FM, producing a continuous wave with the voice signal. Advancements like FM have greatly reduced the cost and made analog systems very user friendly over its long tenure.
With airwave congestion from the ever-growing two-way radio consumer market, the FCC and other legislative bodies have had to put regulations in place to protect the future growth of the industry as well as the security of communications.
The rise of digital radio systems has provided pathways for companies to lessen the amount of bandwidth needed per channel. In essence, the digital system can split the amount of bandwidth used in half through various technological advancements.
You must remember that the two standards, DMR and NXDN, will not communicate with each other. Meaning, if you have a fleet of Motorola radios using DMR to communicate, you cannot add ICOM or Kenwood radios and expect them to integrate into your system seamlessly. In that instance you would need to decide whether to add more Motorola radios, or swap out your entire fleet, to meet your needs.
Before 2013, everybody was using systems that operated with a bandwidth of 25KHz. This was far too large when factoring in the growing number of users vying for space in the radio spectrum, every day.
The figure above shows how many more channels become available by the move to smaller and smaller bandwidths. At 6.25KHz, we have quadrupled the number of channels available for the radio community at every frequency.
If you'd like to learn more specifics about the process of obtaining an FCC license for GMRS or LMR radios, click here. In our FCC licensing article we go over reasons why you would need one type of license over the other, we explain the process of acquiring each license type, and go over some FAQ's about licensing.
Most FRS radio devices are the type you find on the shelves of stores like Walmart, Best Buy, and sporting good locations. These make up the majority of the amateur consumer market for two-way radios.
The FCC defines GMRS as a licensed radio service that uses channels between 462 MHz and 467 MHz. The most common use of GMRS channels is for short-distance, two-way voice communications using hand-held radios, mobile radios, and repeater systems.
These systems are mainly licensed out to individuals who need to use radio systems which exceed the 2-watt power limit put on FRS devices, but there are some cases where small businesses may utilize GMRS as well.
LMR services are generally much higher quality and more complex than its GMRS and FRS counterparts. Public land mobile radio systems are to be used exclusively by public safety organizations (i.e. police, fire, and ambulance services), and use designated special frequencies reserved for the public safety sector by the FCC. Private land mobile radio systems are designed for private commercial use and are utilized by businesses ranging from high-rise hotels land surveying companies. 59ce067264
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