First-to-Air = Easy Microwave, Qpsk

JVC Professional

APRIL 2007

NAB-2007

The ProHD Report


MODULATION	Max Bit	Max Bit
MODULATION	Rate	Rate
	25MHz	12MHz
QPSK	32 Mbps	17 Mbps
16-QAM	64 Mbps	30 Mbps
64-QAM	65 Mbps	46 Mbps

Max Bit

Rate

8MHz

10Mbps

21Mbps

31Mbps

Carrier-

to-Noise

Threshold

10dB

17dB

23dB

Fig. 5. Table shows approx. max bitrates for microwave channels with 25, 12 and 8MHz bandwidth, using COFDM and QPSK/QAM modulation schemes. 2GHz BAS relocation provides for new 12MHz channel width, but recommends 8MHz “pedestal” digital modulation bandwidth when using COFDM due to sideband re-growth adjacent channel interference. Note the 21Mbps in the 8MHz column. ProHD’s MPEG-2 TS (Transport Stream) over 1394 is 19.7Mbps, the only HD camcorder able to supply a TS within the 21Mbps limit for reliable 16- QAM link performance through the 8MHz pedestal 2GHz bandwidth.

The table above gives typical guideline numbers. There are several numbers of modulation variables including Code Rate/FEC and Guard Interval, coupled with maximum transmitter output power in various modes, to ultimately determine reliable range under specific live remote conditions.

JVC’s ProHD GY-HD250U & HD200U are the only HD camcorders (bar none, as of March 2007) capable of delivering a broadcast quality full bandwidth 1280x720p60 compressed TS out over 1394 at a bitrate of less than 21Mbps, enabling robust 16-QAM microwave link performance over 8MHz bandwidth.

First-to-Air = Easy Microwave

In addition to the HD camcorder-to-ENG Van microwave link, the TV Station must even more importantly consider how to cost effectively and easily accomplish the HD microwave link back to the TV studio from the ENG Van, as this is an essential service every day in the First-to-Air quest. Again, ProHD provides an easy solution through the ability to interface and use many existing ENG Van-to-Studio links.

The key is the presence of an existing ASI input in the current digital microwave transmitter in the ENG Van, accepting a compressed MPEG-2 digital video signal within the ASI interface format. The Super Encoder in the ProHD camcorder provides a very high quality compressed HD transport stream through a 1394-to-ASI Bridge to the microwave transmitter/modulator, eliminating the need to purchase a new HD encoder or to purchase a whole new microwave transmitter with a (expensive) built-in encoder.

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NAB-2007 specifications

The JVC NAB-2007 is a notable entry in the world of professional broadcasting and production equipment, showcased by JVC at the National Association of Broadcasters (NAB) Show in 2007. This camcorder was designed to meet the demanding needs of videographers and broadcasters, emphasizing high-definition video quality and advanced technology.

One of the standout features of the JVC NAB-2007 is its ability to capture high-definition video in various formats. It supports both 720p and 1080i resolutions, allowing users to choose the format that best fits their production needs. This flexibility has made it a popular choice among filmmakers, event videographers, and news organizations looking for quality in their content creation.

The camcorder utilizes JVC’s advanced HD CMOS technology, which enhances image quality by providing better low-light performance and reducing noise. This is coupled with a powerful optical zoom lens that enables users to capture detailed shots from a distance, making it ideal for dynamic shoots where proximity to the subject may be limited.

Another key feature of the JVC NAB-2007 is its ergonomic design, which is crafted for ease of use during extended shooting sessions. The camera is lightweight yet robust, providing operators with comfort and stability. Additionally, the user interface is intuitive, allowing for quick adjustments to settings without disrupting the workflow.

Built-in stabilization features further enhance the usability of the JVC NAB-2007, ensuring that footage remains smooth even during handheld operation. This is particularly advantageous for documentary shoots or on-the-go filming where traditional stabilization rigs may be impractical.

Connectivity options are expansive on the JVC NAB-2007, including HDMI and component outputs, enabling seamless integration with various editing systems and broadcast environments. The camcorder also includes features for live broadcasting, making it versatile for both recorded and real-time production scenarios.

In summary, the JVC NAB-2007 encapsulates a blend of impressive features, cutting-edge technology, and user-centric design, making it a suitable choice for professionals in the broadcasting and film industries seeking reliable and high-quality performance in their equipment.