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Topic: MHz


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In the News (Tue 19 Mar 19)

  
  Megahertz - Wikipedia, the free encyclopedia
The unit may be applied to any periodic event – for example, old computers might be said to perform calculations at rates expressed in MHz.
When used in the context of radio, MHz refers to the number of oscillations of electromagnetic radiation per second.
Several parts of the radio spectrum fall into the MHz range.
en.wikipedia.org /wiki/MHz   (168 words)

  
 MHz Networks - Home
Utilizing an innovative approach, MHz produces compelling programs interwoven with core principles that are: globally relevant, engaging, educational and community-based.
The award-winning staff at MHz NETWORKS can bring all the elements of your production or audio project to life.
MHz provides community and classroom-based educational broadcasts to 375,000 students and offers a variety of resources to support educators.
www.mhznetworks.org   (125 words)

  
 * MHz - (Computing): Definition
The 75 MHz bus speed is an interesting advance in many ways, as it pushes the traditional 66 MHz memory speed limit forward.
Abbreviated MHz, a system's clock speed is measured in Megahertz or millions of cycles per second.
They are marketed in MHz (megahertz, the speed of transmission inside the processor) but their real speed also depends on what kind of processor you have.
en.mimi.hu /computing/mhz.html   (1225 words)

  
 MHZusa
MHZ' complex computational fluid dynamic modeling efforts derive their strength from the extensive racing experience and on-the-water testing.
MHZ' racing pedigree is a natural evolution from the design philosophy applied to each component, be it a hull, an engine, or a gearbox.
Although the manufacturing methods MHZ uses are very labor-intensive and very expensive by any industry standard, it is the only way to achieve the ultimate in strength and light weight.
www.mhzusa.com   (639 words)

  
 MHz definition - isp.webopedia.com - The Glossary for Internet Service Providers
The speed of microprocessors, called the clock speed, is measured in megahertz.
To a large degree, this controls how powerful the microprocessor is. Another chief factor in determining a microprocessor's power is its data width (that is, how many bits it can manipulate at one time).
In addition to microprocessors, the speeds of buses and interfaces are also measured in MHz.
isp.webopedia.com /TERM/M/MHz.html   (142 words)

  
 RFI status of 680 -- 920 MHz frequency band of the GBT   (Site not responding. Last check: 2007-10-22)
This note describes Radio Frequency Interference (RFI) measurements in the 680--920 MHz frequency band of the GBT to determine which frequency ranges are relatively free of RFI.
A data set for monitoring RFI in the 680 to 920 MHz was obtained on Jan 22-23, 2002 using the PF1 800 MHz receiver of the GBT in dual polarization mode.
To scan the full frequency band of the 800 MHz system using the spectral processor, the center frequencies were set to 695, 730, 765, 800, 835, 870 and 905 MHz for successive data acquisitions.
www.gb.nrao.edu /~fghigo/rfi_aroshi/rfi800jan22.html   (849 words)

  
 FCC: Lower 700 MHz   (Site not responding. Last check: 2007-10-22)
In 2002, the FCC reallocated the 698-746 MHz spectrum band (Lower 700 MHz Band) that had been allocated to television Channels 52-59.
The recovery of the Lower 700 MHz Band will be made possible by the conversion of television broadcasting from the existing analog transmission system to a digital transmission system.
On September 18, 2002, the FCC completed an initial auction of 740 licenses in the Lower 700 MHz band C and D blocks, or the 710-716/740-746 MHz and 716-722 MHz bands (Auction No. 44) raising (in net high bids) a total of $88,651,630 for the U.S. Treasury.
wireless.fcc.gov /services/lower700   (340 words)

  
 3G Viability Assessment 7-22-2002
The 1990-2025 MHz and the 2025-2110 MHz bands offers the spectral characteristics that could support many DOD requirements, but the bands also have incumbents with no readily apparent band(s) to which they could be relocated.
The 1770-1850 MHz band currently supports additional systems (such as the satellite control earth stations and the air combat training systems) and must absorb the DOD frequency assignments that will be displaced from the 1710-1755 MHz band that are outside of the 16 protected areas.
The 2110-2130 MHz band is paired with the 2160-2180 MHz band, and the 2130-2150 MHz band is paired with the 2180-2200 MHz band.
www.ntia.doc.gov /ntiahome/threeg/va7222002/3Gva072202web.htm   (9827 words)

  
 The 700 MHz Bands   (Site not responding. Last check: 2007-10-22)
The FCC has addressed the reclamation of television spectrum in two proceedings: the Upper 700 MHz Band (60 megahertz of spectrum corresponding to channels 60-69), and the Lower 700 MHz Band (48 megahertz of spectrum corresponding to channels 52-59).
The 700 MHz Band spectrum (both Lower and Upper Bands) offers the potential to deploy new methods of providing high speed internet access, and is suitable for new fixed wireless in underserved areas, as well as next generation high speed mobile services.
The Upper 700 MHz guard bands consist of a total of six megahertz of paired spectrum that was allocated to protect public safety operations in immediately adjacent bands from harmful interference while at the same time promoting the efficient use of this spectrum.
www.700mhz.org /700_mhz_band.htm   (544 words)

  
 Page Title   (Site not responding. Last check: 2007-10-22)
Operation on the 219-220 MHz portion of this band is open to all licensees holding a Technician class or above.
Operation on the 222-225 MHz portion of this band is open to all licensees, regardless of license class.
This portion of the band is for ATV simplex or repeater operations, with 421.250 MHz being the video carrier frequency.
www.clarc.org /RAG/mar98/page3.html   (866 words)

  
 Target PC :: Coppermine Slot 1 650 MHz Processor
Looking back to the Combo of the Year article, I achieved 616 MHz (5.5x112) in DOS and this translated to a stable 550 MHz (5.5x100) at default (2.0) voltage.
The 137 MHz FSB using factory cooling hit the limit of the L2 cache most likely and did not hit the 75C (167F) internal temperature limit.
At the time of this writing, the 1 GHz chips are all but unobtainable and the 866 MHz version costs approximately triple of the 650 MHz chip.
www.targetpc.com /hardware/cpu/coppermine_slot1/index2.shtml   (663 words)

  
 Statement Of Continued Support on 902-928 MHz   (Site not responding. Last check: 2007-10-22)
This allocation, which was finalized by the FCC in PR Docket 93-61, is on a shared, non-exclusive basis, and secondary to Federal Government and Industrial, Scientific and Medical equipment use the band.
The 900 MHz band is also utilized by unlicensed low power Part 15 devices and spread spectrum radios.
No user of the 902-928 MHz band will be required to relocate its use or migrate to the proposed upper DSRC band at 5.8 GHz.
www.itsa.org /committe.nsf/c0654864cdf2bf35852564d1006d899e/654f2eff766c9072852564e5006d88c3   (348 words)

  
 DF5AI.NET - Amateur Radio Propagation Studies
The 2005 sporadic E season has in particular given another example of 144 MHz long distance propagation between the Canary Islands and central Europe which is analyed here (alternative examples of double hop Es in 2005 are still under investigation).
The longest distances, however, result from tropospheric radio propagation from Ireland and England towards the west coast of Africa breaking the IARU Region 1 tropo record which is very impressive.
The distance of 3.493 km landmarked a new 144 MHz dx record in the IARU Region 1.
www.df5ai.net   (1636 words)

  
 Public Safety: 800MHz Band Reconfiguration
This plan is designed to protect the lives of first responders and other emergency personnel and fulfills the Commission's obligation to promote safety of life and property through the use of wire and radio communications.
Consensus Parties file a rebuttal to the Balanced Approach proposal asserting that the 800 MHz public safety interference problem cannot be completely resolved without band reconfiguration, although the Balanced Approach proposals would be a valuable adjunct to band reconfiguration.
Nextel files a "White Paper" proposing reconfiguration of the 800 MHz band to abate the interference being caused to 800 MHz public safety systems, and to pay up to $500 million for relocation of public safety systems to new frequency assignments in the band.
www.800mhz.gov   (1052 words)

  
 Tweak3D.Net - Your Freakin' Tweakin' Source!
While moving to the 133/533 MHz FSB might be as simple as lowering the multiplier and bumping up the front side bus, it takes time and preparation for it to be mass produced, as the Fabs have to be tweaked and setup to produce the processors with very high yields.
This is due to Intel producing the new 533 MHz processors on a 300 MM wafer compared to the previous processors which were produced on 200 MM wafers.
Coupled with the P4 (533 MHz), the i850E is definitely the optimal solution for the Pentium 4, as there are no chipsets that officially support the 533 MHz FSB yet, though the SiS645DX offers unofficial support for it.
www.tweak3d.net /reviews/intel/netburst533   (720 words)

  
 Intel Introduces Pentium® III Processors At 866 And 850 MHz   (Site not responding. Last check: 2007-10-22)
The Pentium III processors at 866 and 850 MHz are designed to power an Internet experience filled with rich audio, video, animations and 3-D that make information come alive.
The Pentium III processors at 866 and 850 MHz are available now in both SECC2 and FC-PGA packaging.
The 866 MHz is priced at $776 in 1,000-unit quantities.
www.intel.com /pressroom/archive/releases/dp032000.htm   (337 words)

  
 Articles on sporadic E and 50 MHz Radio Propagation
At the same time, 144 MHz sporadic E QSOs as well as tropospheric dx propagation was reported.
This situation appears to represent a brilliant example of multiple hop propagation in 50 MHz but the number of skips along the zigzag path between the ionosphere and ground isn't easy to analyse.
Very dense sporadic E layers may exceed critical frequencies of 16 MHz but this models result in critical frequencies around 25 MHz (in 144 MHz sporadic E) or even 35 to 39 MHz (in 222 MHz sporadic E) which evidently no longer reflects the true ionosphere.
www.df5ai.net /Material/articles.html   (2002 words)

  
 FCC: 218-219 MHz Radio Service   (Site not responding. Last check: 2007-10-22)
The 218-219 MHz Service* is a short-distance communication service designed for licensees to transmit information, product, and service offerings to subscribers and receive interactive responses within a specified service area.
218-219 MHz Service channels may also be unable to support proposed operations that require large amounts of spectrum, including certain video, voice, and advanced data applications.
The components of each 218-129 MHz system are its administrative apparatus, its response transmitter units (RTUs), and one or more cell transmitter stations (CTSs).
wireless.fcc.gov /services/personal/218-219   (316 words)

  
 PC Perspective - AMD Athlon XP 2700+ (333 MHz FSB) Processor Review
Rumors of the 333 MHz FSB processors have been abounding for months and during that time all that AMD would say publicly was “we are looking into it.” Well, they were obviously doing much more than that.
As you are no doubt familiar with, the previous Athlon processors all used a 133/266 MHz FSB all the way up to their 2600+ processor released last month.
This was all because the bus on the processor had not changed from the DDR266 standard as introduced with the 1.33 GHz Athlon Thunderbird.
www.pcper.com /article.php?aid=-208   (692 words)

  
 EQUIPPED TO SURVIVE (tm) - 121.5 MHz Going Away
ETS continues to urge all pilots and mariners to install or carry a 406 MHz distress beacon.
For aviation use, because the cost of 406 MHz ELTs continues to be so high, we recommend pilots carry a 406 MHz EPIRB or PLB (purchasable outside the U.S.) as a supplement to the required ELT on board the aircraft.
While the 406 MHz beacons cost more, they provide search and rescue agencies with the more reliable and complete information they need to do their job more efficiently and effectively.
www.equipped.com /uscgsarsat.htm   (891 words)

  
 800 MHz Interference Issue & Rebanding
Beginning in early 2000, several public safety agencies using 800 MHz trunked radio systems discovered that mobile communications were sometimes disrupted--a mobile or or portable radio could not receive or transmit in certain geographic areas.
The plan moves Nextel and other carriers out of areas of the 800 MHz band where they are interleaved with public safety, and creates larger, contiguous allocations devoted to just Nextel or public safety, thereby reducing the chances for adjacent channel interference.
The plan essentially splits the two existing, paired18 MHz allocations into two parts: public safety is allocated the lower 10 MHz of each band (806-816 MHz and 851-861 MHz, channel 1-400), while the upper 8 MHz would be assigned to commercial services (816-824 MHz and 861-869 MHz, channels 401-720).
www.911dispatch.com /info/800_transition   (2848 words)

  
 "How to Work 6 Meter DX" by W3EP
The 28.885 MHz liaison frequency is also a great place to monitor, as a good deal of gossip, news and timely band reports get passed here.
The 50.110 MHz international DX calling frequency has been used for more than 20 years, but its original purpose has been largely eclipsed by the dramatic increase in 6-meter activity over the past decade.
Even if activity starts around 50,090 MHz, CW activity is most likely to migrate up the band to 50.125 MHz, and even higher in search of clear frequencies.
www.ham-radio.com /n6ca/50MHz/6mtrdx.html   (1654 words)

  
 Wireless Carriers Mixed About 700 MHz Pipe Dream - Broadband Week 11/2000   (Site not responding. Last check: 2007-10-22)
The reason: compared to other areas of the radio spectrum, 700 MHz's propagation is "phenomenal," she says.
However, he agrees that a carrier such as Leap could use 700 MHz to add voice and data capabilities to those it already offers at 1,900 MHz through its PCS networks.
In the case of Leap Wireless, "they don't have holdings everywhere," he explains, "so they certainly are interested in upcoming auctions in order to expand their footprint.
www.broadbandweek.com /news/0011/0011_wireless_wireless.htm   (876 words)

  
 Radio   (Site not responding. Last check: 2007-10-22)
Because of their varying characteristics, radio waves of different lengths are employed for different purposes but are usually identified by their frequency (cycles per second).
Radio waves are a form of electromagnetic radiation, created whenever a charged object accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum.
This is the frequency range 3 kHz to 40,000 MHz, wavelength range 1 cm to more than 1 km (0.4 inch to 0.6 mile).
kosmoi.com /Technology/Radio   (1631 words)

  
 N6CA 50 MHz antennas
Mounting tests will be be performed first to assure there will be adequate isolation between the 8 element yagi and this one.
Homebrew hi level transverter, Rx filtered for 50 to 51 MHz pass band, -45 dBc at 54 MHz, noise cancelling input, adjustable phase and gain.
Adding a 43 to 51 MHz "MUF" antenna (above) to drive a 5 pole band pass filter and hi level preamplifier and splitter which will become the "extra" input for several uses in near future.
www.ham-radio.com /n6ca/50MHz/50appnotes/50ants.html   (1032 words)

  
 New Page 2
RADIO FM Radio FM 103 MHz and Television 3 is a joint venture between KCS Cambodia Co., LTD and Phnom Penh Municipality.
Radio FM 103 MHz and Television 3 is located at Nº 02, Russia Blvd, Sangkat Monorom, Khan 7 Makara, Phnom Penh.
Radio FM 103 MHz was equipped with hi-tech using FM Stereo Multiplex System.
www.camnet.com.kh /tv3/Radio103.htm   (241 words)

  
 FCC Explores Options and Alternatives for Improving the Spectrum Environment for Public Safety Operations in the 800 ...
One of the important bands that the Commission has made available for public safety communications is at 800 MHz, which was first designated for public safety use in 1980.
Considers complementary means of reducing interference to 800 MHz public safety communications in addition to reconfiguration of the 800 MHz frequency band, including receiver standards, stricter limits on out of band emissions and more robust public safety signals.
Requests comment on the terms and conditions of licenses in the 900 MHz land mobile band if it is used to relocate displaced licensees.
www.fcc.gov /Bureaus/Wireless/News_Releases/2002/nrwl0204.html   (710 words)

  
 EA6VQ - TEP propagation on 144 MHz.
This report is specially interesting because it's the evidence that TEP on 144 MHz not only works between stations located perpendicular to the magnetic equator (look at the map) and opens new possibilities for more stations the join the tests we surely will run during the next max.
I returned to the cross-band frequency on 10 metres which we used regularly for 28/50 MHz QSOs and managed to contact a station in South Africa who was very far away from ZS6DN but who kindly offered to QSP a message by telephone.
That QSO was on SSB on 144.110 MHz at 2059 JST, between JH6TEW (Kikuchi-shi, Kumamoto Prefecture) and VK8GB (Darwin, Australia), which was a super record for 2 meter DX when you consider that the distance between the two cities is 4,992 km.
www.vhfdx.net /tep.html   (4416 words)

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