0
Hz is a unit of measure for repeated phenomena (e.g. waves) and means "cycles per second" or the number of times the phenomena repeats every second.
M is a metric system unit multiplier meaning one million (1,000,000).
Therefore 50MHz says that the phenomena being measured happens 50 million times per second (50,000,000 cycles per second). This is probably either an electronic signal in a circuit or electromagnetic radiation in the very high frequency radio frequency (VHF RF) band called the "6 meter Ham radio band" (for its approximate wavelength).
Wiki User
∙ 7y ago
Add your answer:
Earn +20 pts
What is clock-doubling?
Technology used in microprocessors used to instruct information twice the normal bus speed. The Intel 80486DX2/50 MHz was the first processor with clock-doubling and was capable of running doubled to 50MHz. Today, clock-doubling is not required as the CPU runs independently of the Front Side Bus and connects directly to the North bridge.
What is pal version of a game?
PAL usually means it was a game made to work on 50MHz PAL television sets, such as those in Europe, parts of South American, Africa, India, etc. It is a television format though, and PSPs and Nintendo DS are in NTSC format by default. Here, PAL just means the region they come from, the regions above. A 'PAL' DS can play a US game no problem.
Where is the ionoshere?
The Earth's ionosphere is a series of layers that reflect radio waves, but mainly at frequencies below 50MHz. They range in height from about 60km to about 300 km, and are affected in height and presence by radiation from our Sun. The lowest, D layer, is seldom used, but those from 100 km to 300 km are of importance to the distance that short wave radio may travel. It was first confirmed by Appleton in 1924, for which he received a Nobel Prize.
Which atmosphere layer contains electrically charged particles that radio waves?
The ionosphere. To clarify, only the low-frequency radio waves incorrectly called "high-frequency" or "HF" of about 50MHz and below are reflected. "Very High Frequency" VHF signals are not reflected, but go straight off into space. For example, in the "AM" commercial broadcast spectrum, the transmission is reflected back to the Earth and is receivable for great distances, a phenomenon that used to be called "skip". AM signals are in the band of 550KHZ to 1.6 MHz. "FM" stations in the band from 88MHz to 108MHz are only received by "Line of sight" transmissions.
Why is Frequency Modulation operated at such high frequencies when compared to its Amplitude Modulation counterpart?
Frequency modulation is better suited for high frequency apps for better quality of service longer range and penetration through solids and better control over TX or Transmit gain levels that can be hazardous at high power ANSWER 2 : I think its more about history . AM was used since the 1920's through WW2 , operating range was between 400khz to 50mhz . FM "Broadcast" Band came much much later although the idea of Frequency Modulation was old by then . If you were to modulate a typical 75khz FM signal (music) , it would take up the space of 6 AM stations on the old band . Operating up in the VHF frequency range meansMUCH smaller antennas and less power (although signals are more line of sight and would not travel as far as the AM stations , this is about frequency and not mode . FM has a much better signal to noise ratio so you will have better range on THE SAME FREQUENCIES with FM .
How does the intelligence signal modulates the carrier?
There are three major types of modulation:AM, Amplitude Modulation, where the modulation signal is altering the amplitude of the carrier according to its own amplitude, normally this is done in the output stage. Therefor a strong audio signal is necessary at the same or a little less than the power of the carrier, never higher, because that will over modulate the carrier that will resort in distortion of the receiver output. AM is used in the lower band of the RF spectrum.FM, Frequency Modulation, where the frequency of the carrier is altered by the audio signal. When the amplitude of the audio is going higher the frequency go lower. Modulation happen at the oscillator stage, therefor a small audio signal is used to modulate the frequency. FM is normally used in the higher frequency range of the RF spectrum, 50MHz and up.FSK, Frequency-shift keying, used for data transmission, this type of modulation is simply, switching the carrier on and of, a high bit will switch the oscillator on and a low bit will switch it off, in some designs a low will be on and a high off.
Why does US TV programming start at channel 2 why not start at channel 1?
I'm not an expert in this area, but I know it has to do with broadcast frequencies. Radio and Television, as industries, must use certain bands of frequencies in AM / FM. In the very beginning of television (which most families did not have a TV set until the late 1940s-mid 1950s), TV broadcasters did try to use Channel 1. But it overlapped frequencies with and interfered with land radio broadcasting. So the FCC had to restrict Channel 1 to radio only. Wikipedia goes on to explain: "TV Channel 1's last location was 44-50MHz. Land mobile radio and television broadcasters shared the same frequencies until 1948. This shared allocation was eventually found to be unworkable, so the FCC reallocated the Channel 1 frequencies for public safety and land mobile use and assigned TV channels 2-13 exclusively to broadcasters."So that is why television does not receive any broadcasts over Channel 1. It's amazing to realize the history that goes back to pre-1930s radio!
What layer is hit by the sun's ultraviolet rays and cause the air particles to become electrically charged?
The ionosphere. To clarify, only the low-frequency radio waves incorrectly called "high-frequency" or "HF" of about 50MHz and below are reflected. "Very High Frequency" VHF signals are not reflected, but go straight off into space. For example, in the "AM" commercial broadcast spectrum, the transmission is reflected back to the Earth and is receivable for great distances, a phenomenon that used to be called "skip". AM signals are in the band of 550KHZ to 1.6 MHz. "FM" stations in the band from 88MHz to 108MHz are only received by "Line of sight" transmissions.
What frequency range does the unites states use for FM broadcasting?
It depends on from which country the signal is broadcasting . In general it is the range of kilo to mega Hz. usually, throughout the world 87.5 MHz to 108.0 MHz is used . A2 The range of any RF signal is dependant on the power output, the height and efficiency of the aerial. So there is no information to give you an answer. The difference between FM and AM, is that FM has the 'capture effect'. This is where the strongest signal wins, at the receiver. AM signals on the same frequency, will compete and beat together, so you will hear both stations at the receiver. FM signals at the receiver will detect the strongest signal and supress a weaker signal on the same frequency, so you only hear the stronger signal. If you are tuning into a weak FM signal, the background hiss will increase with range until you cannot hear the signal over the noise. FM is more desirable for quality signals containing music, at close range. AM suffers more from other stations but does not get noisey with range, so weak communications can be heard at a greater range. This is desirable for communications.
Why is there no channel one on TV?
When the U.S. Federal Communications Commission initially allocated broadcast television frequencies (after the first post-WWII telecommunications conferences formally allocated TV frequencies in 1945-1946), channel 1 was logically the first channel. In 1945, the FCC decided to reserve channel 1 for low-power community television stations, and moved existing channel 1 stations to higher frequencies. The FCC in 1948 formally changed the rules on TV band allocations based on propagation knowledge gained during the era of shared-user allocations. The 44~50MHz band used by Channel 1 was replaced by lower-power narrowband users. Channel 1 was reassigned to: * fixed and mobile services (44-50 MHz) Rather than renumber the TV channel table, it was decided to merely remove Channel 1 from the table. In the 1990s, it was decided that digital television would be limited to the channels between 2 and 51, so that another 18 channels (from 698 to 806 MHz) could be auctioned and given to DAB radio or emergency services such as police radios. Renumbering in this case is not relevant, as virtual channels maintain the original TV station brand number, despite actually transmitting on another channel. Digital cable subscribers in many areas, such as those serviced by Comcast, can find video on demand content at Channel 1. Cable subscribers in the New York area receive the channel NY1 on channel one, served by Time Warner Cable and Cablevision. In Europe, other recently abandoned TV channels are being used for DAB digital radio, in VHF band III. Japanese public broadcaster NHK General TV broadcasts on Channel 1 in Tokyo and other cities.
What are some RISC and CISC examples?
CISC: Manchester Baby, EDVAC, EDSAC, BINAC, UNIVAC I, IBM 704, IBM 650, IBM 305, IBM AN/FSQ-7, IBM 7090, IBM 1620, IBM 1401, DEC PDP-1, Apollo Guidance Computer, IBM System/360, UNIVAC 1107, DEC PDP-8, DECSYSTEM-10, Intel 4004, Intel 8008, Intel 8080, Zilog Z-80, Zilog Z-8000, DEC PDP-11, Data General Nova, Motorola 68000, Intel Pentium, DEC VAXRISC: CDC 6600, CDC 7600, Cray-1, Cray-2, Cray-3, Sparc, IBM RISC, IBM POWER, Intel i960, MIPS, Motorola 88000, DEC Alpha, PowerPC, ARMNote: CISC was very important when memory was small and very expensive as it allowed programs to be reduced in size. It was also very important when more programming was done with assembly languages than with high order languages as it made for instructions that were easy for programmers to understand. But with declining memory costs and almost all programming being done with compilers, research showed that that most of the instructions in a CISC instruction set were redundant and not needed. Eliminating them and reducing the instruction set to just a core of essential instructions allowed for both a significant reduction in the hardware needed to build a computer and the development of simpler more powerful compilers. With less hardware in the computer optimizing its design for higher speeds became much easier. Thus the concept of RISC was formed.The CDC machines and the Cray-1 listed above were designed before the concept of RISC formally existed, but clearly meet its definition in retrospect. Designed by Seymour Cray, his primary goal was to produce the fastest computer possible at the time, which required elimination of all unnecessary hardware that might limit the speed of the machine. He even eliminated all data synchronization latches/registers, instead using hand tuned delay lines made of loose hanging loops of twisted pair to make sure signals arrived where needed at exactly the right time.
How do you program a regency hx1500 hand held scanner?
01) Press Manual to enter the manual mode. 02) Enter frequency. 03) Enter channel number (e.g. for channel 1, enter 01). 04) Press Manual again. Note: When entering a number of channels, you can start at step 2 after the first frequency is entered.
