Plus Vhf
Plus Vhf
I want to introduct something about Wine Thermometer (JWW). * The wine thermometer is of delicate style which can be easily inserted into a wine bottle to measure temperature * It can not only help people to find a desirable temperature to drink, but Also create some fun * Nominal range: (0-30/0-40)C * Scale division: 1C * Fillings: Organic liquid * Total length: 130mm * Material of the top decoration: Brass (chrome platin
(Redirected from 2 Meters)
The 2 meter amateur radio band is a portion of the VHF radio spectrum, comprising frequencies stretching from 144.000 MHz to 148.000 MHz in ITU Regions 2 (North & South America plus Hawaii) and 3 (Asia and Oceania) and from 144.000 to 146.000 MHz in ITU Region 1 (Europe, Africa, and Russia). The license privileges of amateur radio operators include the use of frequencies within this band for telecommunication, usually conducted locally within a range of about 100miles (160km).
Operating on 2 meters
Because it is local and reliable, and because the licensing requirements to transmit on the 2-meter band are easy to meet in many parts of the world, this band is one of the most popular non-HF ham bands. This popularity, the compact size of needed radios and antennas, and this band’s ability to provide easy reliable local communications also means that it is also the most used band for local emergency communications efforts, such as providing communications between Red Cross shelters and local authorities. In the U.S., that role in emergency communications is furthered by the fact that seemingly every amateur-radio operator has a 2 meter mobile radio or walkie-talkie.
Much of 2-meter FM operation uses a radio repeater, a radio receiver and transmitter that instantly retransmits a signal over a longer distance. However, even without repeaters available, it provides reliable crosstown communications throughout smaller towns and that makes it ideal for emergency communications. Simple radios for FM repeater operation have become plentiful and inexpensive in recent years. A fully-functional FM transceiver and antenna can be obtained for under US$200 new and far less used for a modern one.
DX
While 2 meters is best known as a local band, there are many opportunities for long distance (DX) communications. Occasionally, bending in the atmosphere’s troposphere (ducting) can allow 2-meter signals to carry hundreds of miles. This is called a lift.
In rare cases, Sporadic E propagation can bring contacts well over a 1,000miles (1,600km). 2 meters is also utilized in conjunction with 70cm (Mode B or V/U) on some amateur radio satellites, giving distances of up to around 3,000miles (4,800km) with a Low Earth Orbit satellite.
A set of 2 long Yagi antennas for the 2 meter band fed in phase to obtain more gain and narrow main lobe of radiation (WA6PY)
By speeding up Morse code using an audio tape recorder, or using a computer, very short bursts of signal can be bounced off the ionized gas trail of meteor showers allowing DX. This is often called Burst transmission.
Another phenomenon that produces upper atmosphere ionization suitable for 2M DXing are the auroras. Since the ionization persists much longer than meteor trails, regular audio signals can be used, but the constant movement of the ionized gas leads to heavy distortion of the signals causing the audio to sound ‘ghostly’ and whispered.
To communicate over the longest distances hams use moonbounce. This involves high power and good antennas to reflect the VHF signals off the moon. VHF signals normally escape the earth’s atmosphere, so using the moon as a target is quite practical. Due to the delay of the signal traveling to the moon and back, a person transmitting may hear the end of his own transmission returning.
Links to 2m propagation sites
DX-Sherlock’s real-time 2m propagation maps
DX-Sherlock’s real-time VHF&up propagation ticker
References
^ US Amateur Radio Frequency Allocations. http://www.arrl.org/FandES/field/regulations/allocate.html accessed 12 May 2008.
^ RSGB UK band plan. http://www.rsgb.org/spectrumforum/bandplans/RSGB Band Plan master.pdf or http://www.rsgb-spectrumforum.org.uk/Papers/RSGB Band Plan master.htm Accessed 14 May 2008.
^ Sharing spectrum with other services a ham radio reality. The ARRL Letter, Vol. 20, No. 2. http://www.arrl.org/arrlletter/01/1102/ Accessed 14 May 2008.
^ http://www.rsgb.org/getlicence/#foundation RSGB licensing guide
^ http://www.rsgb.org/emergency/ RSGB Radio Emergency & Public Service Communications website
Very high frequency (VHF) and ultra high frequency (UHF) amateur radio bands
VHF
UHF
6 m
4 m
2 m
1.25 m
70 cm
33 cm
23 cm
13 cm
50 MHz
70 MHz
144 MHz
219220 MHz
420 MHz
902 MHz
1.24 GHz
2.32.31 GHz
54 MHz
70.5 MHz
148 MHz
222225 MHz
450 MHz
928 MHz
1.3 GHz
2.392.45 GHz
Categories: Amateur radio bands(and so on) To get More information , you can visit some products about health protecction instrument, virtual digital multimeter, . The Wine Thermometer (JWW) products should be show more here!
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Article Source: ArticlesBase.com – 2-meter band
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Superb LCD Home Theatre Media Projector with HDMI and DVB-T
Superb LCD Home Theatre Media Projector with HDMI and DVB-T. When you need a big video display unit for your home or office then you need a projector with reliability and multiple video input types – the CVSAK-3300 is the product you have been looking for!
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Add to all this, the ability to view from multiple video input types (including USB and SD cards) plus built-in Analog and DVB-T tuners and you have the makings of a new best friend – the CVSAK-3300 Media Projector! Available right now at a factory direct wholesale price. Click “Add to Cart” now to preview the shipping cost and have us instantly ship this out to you today. Do not pass up the opportunity to see just how good this projector really is!
Note:This projector includes a 220-240V power supply. If you need a 100-120V model then please contact our customer support team.
Manufacturer Specifications
- Main Function: LCD Home Theater Media Projector with HDMI and DVB-T
- Contrast: 500:1
- Resolution:
- Native: 640×480
- Support for 800×600, 1024×768, 1280×1024 Computer resolutions with down scaling
- Support for 1080i, 720P, 576P, 480P, 576i, 480i TV resolutions with down scaling - Audio Output 2 W x 2
- Projection Size: 23-120 inches
- Projection Distance: 1.2m to 5.2m
- Media Format Support: MPEG 4, AVI, DIVX, XVID, MP3, JPEG
- Color System: PAL, NTSC, SECAM – auto switching inputs
- TV Tuner Color System:
PAL BG, PAL DK, PAL I
SECAM L, SECAM L - Analog TV Tuner: VHF-L, VHF-H, UHF
- Preset DVB-T TV Tuner Profiles: Norway, Sweden, Finland, Greece, Australia, Germany, England, Italy, France, Spain, Holland, Taiwan
- Video Inputs:
- HDMI
- Component
- VGA
- Composite
- SCART
- S-Video - Other Inputs:
- TV Antenna
- SD Card up to 4GB
- USB up to 4GB - Noise: <35dB
- Exiting Beam Brightness: 1800 Lumens
- Power Source: 210-240 Volt AC
- Dimensions: 258mm x 323mm
- Manufacturer Ref: F44O1EAF8R6Z
Product Notes
- Keystone Correction and Picture Rotation
- Automatic Cool Down to Prolong Lamp Life
- Picture in Picture
- Manual Focus Adjustment
- Adaptive Color Management – ACM
- Adaptive Contrast and Color – ACC
- Direct Correlation De-Interlace – DCDI
- Optional Password Power On
- Auto Power Off with No Signal
- Note:This projector includes a 220-240V power supply. If you need a 100-120V model then please contact customer support team.
Package Contents
- Model CVSAK-3300
- Manual
- Power Cord
- Remote Control
- Stereo AV Leads
- VGA Cable
- TV/DVB-T Antenna
FAQ – Frequently Asked Questions
- Which DVB-T standard is supported with this tuner, MPEG2 or MPEG4 (H.264)? This unit supports DVB-T MPEG-2 broadcasts.
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Current Reviews: 3 This product was added to our catalog on Monday 14 April, 2008.
Reviews for: (Superb LCD Home Theatre Media Projector with HDMI and DVB-T)
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