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Dołączył: 29 Paź 2010
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 Wysłany: Wto 8:08, 07 Gru 2010 Temat postu: uggs nederland Yichun City Radio and Television Bu |
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Microwave Radio and Television Bureau Yichun frequency switching system
And then manually switch from the executive members of the crew. When you hear a very long time to switch, often affect the normal conduct of the meeting. Therefore need a quick transition of television signals switched micro-controller. 2. Thinking of microwave equipment have multiple audio channels, the way in which sound signals used to control the signal transmission to the station, and then demodulated by the station controller's modem, and then judged by a single chip which you want to switch to a station, and perform switching tasks . 3. Design programs take into account the reliability and service life, using four ultra-high frequency transistors as switches. Four transistors work in the off state, saturated conduction IF signal when the impedance is very small, while in the final output amplifier with a level of compensation, it can make the output level and the input level of basic equality. Sent by computer to issue commands through rate of 1200 b-'SK teach modem wave modulated input channels of audio equipment. In another bow dragon adjusted by the same modem, and then judged by the MCU after the control of electronic switching frequency signal. Calculated to avoid false switching, so send a command to send 30-100 consecutive identical characters, and receivers for 10 Chi is to determine when to switch the same characters. This ensures a very small probability of false switching. 4. Difficulties found in the test frequency signal radiation is very strong, much crosstalk, input to output isolation is not easy to improve. Found by trial and error after a multi-stage switch, and the shielding between the various control transistors, and circuit board area to meet her husband can improve the embroidery from the degree. So with four cut-off frequency of 1.5GHz the 3DG44 ultra-high frequency transistors, composed of four electronic switches. Placed in a small dish cable splitter, and then cross-shaped shield made of tinplate, the four transistors in 4 hours embroidery area. The guillotine test the degree to 6odB from about embroidery. S. The actual effect of switching the evaluation results, see TV western basic crosstalk. Switching is relatively smooth, only occasionally switching to the situation,[link widoczny dla zalogowanych], however, but then cut again to switch over. This error may be caused by instruction,[link widoczny dla zalogowanych], to be later improved. * 42 * Second,[link widoczny dla zalogowanych], the concluding remarks of the system using a computer in general and other high-level language, tools, and the design and implementation is very convenient, from design to completion with only about two months, and modular design,[link widoczny dla zalogowanych], easy expansion, in the second phase project added six points, while the software instructions can only be amended accordingly. The controller development for future implementation in the same microwave frequency switching system provides a certain amount of experience - letters from the forward side IF frequency electronic switch input system schematic diagram of the {/ ADSL and cable modems / 1, to put to death for environmental performance angle, ADSL and cable transfer {imprison the two modulation techniques are analyzed and compared. U.S. word-ADS-L Lu Wong Banana playing yeast Cable-Mod-em miles Dong do I. Introduction ADSL and electric slow tune {imprison as two new user access technology, is currently subject to a wide range of concerns. From the current development status before the point of view, both have great prospects of development prospects and the city temporarily, such as the Internet Zouren, home office few, remote LAN access,[link widoczny dla zalogowanych], distance learning, as well as sold and will be sold the next 10 years PC, out of thousands of private network access offers. System of ASL and cable Lan thistle can be applied in these areas. ADSL, or asymmetric ring mushroom effect woo users. The so-called asymmetry. It is built up and down Hee Jae inconsistent, down effect, according to Heritage slaughter of up to 9Mbit / s, uplink efficiency, according to Koo left up to 640kbit / s. It can not increase the existing telephone copper wire and does not affect business conditions, increased access of existing loop rates. In order to fully dense spectrum, * 43 *
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