描述
快速的線性衰落會(huì)使得基帶脈沖失真。這種失真是線性的,并會(huì)產(chǎn)生符號(hào)間干擾。自適應(yīng)均衡器可以通過(guò)消除線性失真來(lái)減少符號(hào)間干擾。
緩慢的衰落會(huì)導(dǎo)致信噪比的降低。糾錯(cuò)編碼或者接收分級(jí)能夠克服緩慢衰減的這種影響。
衰減測(cè)試可以通過(guò)以下步驟來(lái)完成:先把測(cè)試信號(hào)在傳送到接收器之前通過(guò)一個(gè)無(wú)線信道的仿真器,經(jīng)過(guò)仿真器模擬信號(hào)的多個(gè)路徑,因此到達(dá)接收器的信號(hào)是多個(gè)信號(hào)的組合。再有接收器進(jìn)行信號(hào)處理。接收器必須能夠在處理該組合信號(hào)時(shí)能保證一定的誤碼率。衰落測(cè)試的設(shè)置與靈敏度測(cè)試很類似,只不過(guò)多出一個(gè)仿真通道。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
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⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
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◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
Allen Bradley Input Module 1771-IAD/D Series D#8386
Allen Bradley Power Supply Module 1771-P4S Ser B#8388
Omron Power Supply 3G2A3-PS221#8389
Omron I/O Device 3G2A3-PS221#8390
Moog Servo Motor 304-151A,Size 10,#8409
Circuit Board SS Proportioning 1094V0#7156
Engel 4 Channel Output Card AUSG77 EGD#7166
Mitsubishi Output Module AY51 Program Control#10814
Yuken Directional Valve T-DSG-01-3C4-D2?4-50248#10610
Vickers Power Amplifier EEA-PAM-561-A-3?2*NIB*#24590
Rexroth Proportional Amplifier VT5003 S42 R1#24599
Rexroth Proportional Amplifier VT5003 S41 R1#24600
Rexroth Proportional Amplifier VT5003-42/R1E#24602
Mitsubishi AD61 Programmable Controller Melsec#8007
Melsec AY11A High Speed Counter Controller#8008
Melsec AY23 Programmable Controller Mitsubishi#8009
Omron C120-SI021 Programmable Controller,#8012
Condor Power Supply CBB-105W#16937
Barber Colman 80CC-11001-002-?0-00 Sequence MACO#24836
Yuken Dirctional Valve T-DSG-01-3C40-D?24-5007#10608
Barber Colman 880BB-00020-002?-0-01 Insta Set Mod#24837
NEW Epoch Engel Heater Band IC 1000-300TA 1300W#22183
Fanuc CPU Control Board A16B-2200-0160/06B#24843
Parker Valve,LV41A,250 PSI,#11866
Battenfield Heater Band 180 Watt#22201
Payne Engineering Power Controller 18D-1-10#5239
Westinghouse Circuit Breaker 4990D03G05#5237
Westinghouse 4990D03624 Circuit Breaker#5235
AEC Temperature Control Unit A0535011#10604-06
Bodine Electric Gear Motor 42D5BEPM-E3 1/4HP#17013
Watlow Relay,KD30-1000-4U00,25 Amp,#11867
Red Lion Controls Slot Scan Module MCI 4Y01A#10603
Ceramic Heater Band 0381.300.02.051 2750W#22408
Gettys PC Board 11-0092-07 Circuit Board#11053
Fast Heat Ceramic Heater Band BKX10845 1375 Watt#22410
Springer Co-Ax Valve MK102C11GGB3/8P?20XB#10494-95
GE Fanuc Controller,IC693CPU321D,#11868
Gettys PC Board 11-0092-100 Circuit Board#11065
Fast Heat Heater Band BMX15345 288 Watt#22413
Numatics Valve Regulator VS22-04,C22D-04,F22B#16928
Heater Band 314511-B,375 Watt#22418
Numatics Valve Regulator VS22-03,R22R-03,F22B#16929