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Бытовая электроника и электротехническая продукция /  Аудио и видеотехника /  Принадлежности для аудио и видеотехники / 
Информация о производителе
Компания:
Analog Systems
 
Адрес:
38, Dlf Industrial Area, Kirti Nagar, New Delhi, Delhi, India
 
Телефон:
+00-91-9810702568

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Sharp Vision Low Noise Pre Amplifier AS 1520 is designed for control rooms having more than fifty channels to compensate the losses due to more than one combiner in series.Features:Low Noise Pre AmplifierControl Room ApplicationFreq. : 40 ~ 860MHz106 Ch. Loading CapacityAccepts High I / P Level18dB GainC / N better than 54dBGood CSO, CTB characteristicsDual OutputMains cum Power passVoltage Selection LEDPlug-in Slope CardWhy Use Low Noise Pre Amplifier AS 1520:Calculations for combiner losses with 30dB Hybrid Amplifier at headend:Step 1: Average output level of modulator = 108dBuVStep 2: Losses due to two combiners in series (Approx. ) = 28dBStep 3: Net output after combiners = 108-28 = 80dBuVStep 4: Gain of Ordinary Hybrid Amplifier = 30dBStep 5: Net O / P level after Hybrid Amplifier = 80 + 30 = 110 dBuVThis Output will result in Intermodulation & poor C / N. Even with the help of Gain Control of the amplifier, it may no be possible to avoid intermodulation.To overcome this problem, Sharp Vision is manufacturing a Low Noise Pre Amplifier AS 1520. The gain is 18dB with high C / N & Low Noise Figure. Now the above calculations will stand as follows:Step 3: Net output after combiners = 108-28 = 80dBuVStep 4: Gain of AS 1520 = 18dBStep 5: Net O / P after AS 1520 Amplifier = 80 + 18 = 98dBuVThis Output will have a high C / N, Low Noise & No Intermodulation-The result is a much better picture quality for the networks with high cascade.Specifications:Gain : 18dBAdjustable Gain : 0~20dB AdjustableOutput Level : 100dBuVSlope (Fixed) : 9 / 12 / 15dB (Optional) (Standard 0dB)( for 550 / 750 / 860MHz)Flatness : + 0. 2dbReturn Loss : >14dBNoise Figure :Monitor : -20dBMains Voltage : 220VAC + 10% , 50HzPower Pass : 30 / 40 / 50 / 60 VAC (Selection with Slide Switch)
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