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Audio Antenna Range

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Featured Article: Audio Antenna Range:

CD quality sound system

When compared to conventional AM/FM broadcasting, DAB has a lot of advantages. When compared to normal FM broadcasting the DAB has the benefit of high sound quality. Any other external sources don't interfere with this DAB. However, DAB has a unique capability to serve the mobile audience, thus providing high-quality coverage wherever and whenever it is required.

Efficiency of the spectrum

Another major advantage of DAB is spectrum efficiency. It means that there will be a possible way to increase the number of stations initially. DAB can serve a minimum of three when compared to FM without congesting the radio waves. This audio coding method is more efficient, it is possible to carry more radio programs with no degradation to existing services, and without changing the existing receivers.

Active echoes

DAB has the ability to add Passive echoes in a constructive manner to the direct signals already received. It can also use Active echoes. There won't be any time delay between transmitters present at a particular area. This is known as Single frequency network (SFN) concept. In terms of frequency and time, all the SFN transmitters need to be synchronized. Another major concept is Gap-filling technique. It represents the second type of application which makes full use of the active echo concept. A gap-filler receives the signals from the main transmitter and retransmits them on the same frequencies at very low power consumption. Although there will be some time difference between main transmitter and the gap filter. The gap-filling concept is flexible for both terrestrial and the satellite broadcasting systems. In the case of FM transmission, while travelling the driver has to retune his receiver while moving from one transmitter signal to another one. DAB eliminates this problem due to two modern concepts, Single frequency network and Gap filling.

Ideal bit rates

The Eureka 147 DAB system is a flexible and dynamically reconfigurable modern system. It can accommodate wide range of bit rates between 8kb/s to 384kb/s, with a range of channel protection mechanism. The range of bit rate is directly proportional to the quality of the transmission. Some broadcasters are using low audio bit rates per audio channel (16kb/s - 64 kb/s); in order to transmit more channels at slightly reduced quality. With a bit rate of 32 kb/s per audio channel, the Eureka multiplex of 1.5 MHz can accommodate as many as 36 channels, with half channel protection level.

Data transfer

A large variety of programme and independent data services can be transmitted using this Eureka DAB transmission system. All the data services are probably transmitted from the outset and the signals will be received by the receivers of first generation DAB system. The encoded signals from the DAB transmission system will be received by data receivers, including which are all incorporated within desktop and notebook computers. The electronic weather reports and the data transmission are good examples of receivers incorporated within the computers. The Eureka DAB system has high resistance against multipath and other reception impairments of data reception in the mobile environment. The Eureka DAB system is an ideal replacement to the wired Information Highway distribution system now being established worldwide.

Difficulties in FM radio reception

In case of FM radio transmission the listener have to install a good outdoor antenna. A majority of radio listeners today use mobile receivers. These mobile receivers use a simple whip antenna, resulting in substandard FM reception quality in many areas. The quality of FM reception inside a building and compact places is questionable. This problem is due to loss of signal during the internal reflections happening within the building. Eureka DAB reception will be good even at these kinds of places. When using mobile receiver, shadowing problem may occur. Shadowing is defined as Blocking of signals by the buildings which all lie in the direction of signal transmission. This won't happen in Eureka DAB.

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4X BNC Wireless Audio Camera + AV Receiver - 50 Meter Range

Four high quality 1.2GHz wireless cameras with BNC wireless connections and built in MIC's plus a wireless receiver set for super long 50 Meter wireless security. These four outdoor or indoor cameras mix the quality of wired surveillance with easy setup and use of wireless cameras and receivers. Some excellent features include 2 different channel selections on the camera to avoid interference, an AUTO IRIS IN for attaching your own high quality zoom lens in place of the included lens if you so wish, and AV OUT on the wireless receiver for viewing the transmitted audio and video on a TV screen.

This four camera wireless set is one of the best ways to combine maximum surveillance coverage and range with a low wholesale price. Brought to you as always by the leader in direct from China electronics, Chinavasion

This product uses the PAL color system.

Manufacturer Specifications

Receiver Specifications

• Receiving Frequency: 1.2GHz
• Intermediate Frequency: 480Mhz
• Frequency Stabilization: +/-100Khz
• Demodulation Mode: FM
• Antenna: 50ohm SMA
• Receiving Sensitivity: -85dBm
• Power Source: DC 9V
• Dimension: 114mm x 81mm x 21mm (L x W x D)
• Channels Available: 4
• Channel Select for multiple cameras
• AV OUT

Camera Specifications

• Image Device: 1/3 Inch CMOS
• TV system: PAL
• Horizontal Definition: 380 Lines
• Effective Pixel: PAL: 628 x 582
• Angular Field of View: 45deg
• Minimum Illumination: 3LUX f=6mm
• Synchronization System: Internal
• Backlight Compensation: Auto
• White Balance: Auto
• S/N Ratio: >48dB
• Operation Temperature: -5 ~ +35 deg C
• Transmission Frequency: 1.2GHz
• 2 Channels
• Locked Frequencies
• Power Adapter: DC 9V
• Recommended Max Range for Objects: 15 Meters at Day
• Transmission Range: 40~50 Meters (without block)
• BNC Video OUT Connection: Connect Antenna for Wireless Transmission or BNC Cable for Wired
• Built in MIC: Audio Range approx 5 Meters
• AUTO IRIS IN: detach supplied lens and mount your own with zoom
• Screw Mount under Camera
• Weatherproof
• Manufacturer Ref: T8DAYB28MQ7U

Package Contents

• Model WS868AS4-PAL Wireless Video Camera Set
• User Manual
• AV Cable
• Power Adapters
• Antennas

 

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You will find much more.

Current Reviews:    1 This product was added to our catalog on Monday 04 July, 2005.

Reviews for: (4X BNC Wireless Audio Camera + AV Receiver - 50 Meter Range)

  4X BNC Wireless Audio Camera + AV Receiver - 50 Meter Range Fantastic productby Seamus Hurley - on 02/04/2009

I have installed these little cameras around the perimeter off my workshop , The furthest point was the max 80m, I was very impressed with the fantastic reception i received , GREAT PRODUCT.

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how can i send audio and video signals to all the simple antenna for tv?

i want to buy a audio video sender range up to 300 meter to 500 meter that send audio and video channel through signals for all tv anteena. that no requires an extra antenna.

plzzz visit this link but it has low range.

http://cgi.ebay.ca/ws/eBayISAPI.dll?View…

please help me for this purpose.

You're looking for an AV transmitter that will transmit on TV channel 3 or 4 for 1/3 of a mile. The transmitter may be legal, but the distance you want is not. Here are a link to some AV transmitter units out there. The 2.4 GHz wi-fi unit range can be boosted with high gain antennas from MFJ Enterprises.

BTW Your link didn't work.

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