print barcode printer c# All ampli ers have proper voltage, and power supply is only 75 percent fully loaded in Software

Print PDF 417 in Software All ampli ers have proper voltage, and power supply is only 75 percent fully loaded

All ampli ers have proper voltage, and power supply is only 75 percent fully loaded
Make PDF 417 In None
Using Barcode drawer for Software Control to generate, create PDF-417 2d barcode image in Software applications.
Recognize PDF-417 2d Barcode In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
APPENDIX D
Generating PDF-417 2d Barcode In C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create PDF 417 image in VS .NET applications.
Print PDF417 In .NET
Using Barcode creator for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
Broadband Noise Combining
PDF417 Creator In .NET
Using Barcode creator for VS .NET Control to generate, create PDF417 image in .NET applications.
PDF 417 Encoder In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
This appendix discusses the noise-combining effect in single cable reverse cable television systems In a subsplit reverse system, carrier C1 is at channel T-7 (70 MHz) and C2 is at channel T-8 (13 MHz) These channels are combined in a splitter and a directional coupler with equal noise levels Channel T-7 Channel T-8
Print Universal Product Code Version A In None
Using Barcode maker for Software Control to generate, create UPCA image in Software applications.
Encoding ECC200 In None
Using Barcode generation for Software Control to generate, create DataMatrix image in Software applications.
C1 N1
Print Bar Code In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Create Bar Code In None
Using Barcode creator for Software Control to generate, create bar code image in Software applications.
C1 C2
European Article Number 13 Generator In None
Using Barcode drawer for Software Control to generate, create EAN / UCC - 13 image in Software applications.
GS1-128 Generator In None
Using Barcode generator for Software Control to generate, create UCC-128 image in Software applications.
20 dBmV carrier level 20 dBmV carrier level
Printing International Standard Serial Number In None
Using Barcode generation for Software Control to generate, create International Standard Serial Number image in Software applications.
Paint GS1-128 In Java
Using Barcode printer for Java Control to generate, create GTIN - 128 image in Java applications.
C1 / N1 45 dB
Print ECC200 In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
Encoding Bar Code In Java
Using Barcode generator for Android Control to generate, create bar code image in Android applications.
N1 N2
Barcode Printer In Java
Using Barcode encoder for BIRT Control to generate, create bar code image in Eclipse BIRT applications.
GS1 - 12 Reader In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
At output C1 N1
GS1 - 13 Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
UCC-128 Drawer In Java
Using Barcode encoder for Android Control to generate, create GS1 128 image in Android applications.
25 dBmV noise level 25 dBmV noise level
20 dBmV 25 dBmV
17 dBmV C 1 / NO 28 dBmV
42 dB
C2 N2
20 dBmV 25 dBmV
Combiner / splitter C2 N2 C 2/ N 2 45 dB 20 dBmV 25 dBmV C 2 / NO 42 dB
Since noise level is constant across the frequency band, the output noise NO 28 dBmV 3 dBmV 25 dBmV
At output C 1 / NO C1 / N1 C1 N1 C2 N2
20 dBmV 25 dBmV 20 dBmV 25 dBmV
19 dBmV
( 254 dB)
445 dB
45 dB
C1 N1
19 dBmV 26 dBmV C 2 / NO 10 dBmV 35 dBmV 10 dBmV ( 254 dB) 355 dB
1 dB 10 dB
Directional coupler C2 N2 C /N 45 dB
To combine N1 and N2 at the output on a power basis, 26 26 10 log N1 10 log N2 log N1 log N2 log NO NO 10 log NO 26 35 NO N1 N2 NO 000256 000032 000288
10 log 000288
254 dB
Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use
Appendix D
Summary: In the case of the two-port combiner, carrier-to-noise level for both C1 and C2 was decreased by 3 dB For the case of the 10-dB directional combiner where C2 is combined with C1 through the 10-dB port, C1 only had a 1 2-dB decrease in carrier-to-noise level, while C2 had a 91 2-dB decrease in carrier-to-noise level
APPENDIX E
Cascaded Ampli er Theory
Noise voltage generated by a 75-ohm resistor at 20 C, expressed in dBmV This voltage appears across the input resistance of the rst 75-ohm ampli er in a cascade of repeater ampli ers
RN 75 VN 75 R IN
VN K T B RN Boltzmann s constant, 138 temperature, in K frequency bandwidth, in Hz resistance, in ohms 273 C
4KTBR
________
At 20 C, T 20 C B 4 106 Hz VN
293 K For a video bandwidth of 4 MHz,
_____________________________________
138 10
4 10
75 22 10
485,208
2 mV
_______________
485
____________
This is the noise VN generated by RN; it appears across a circuit of two 75-ohm resistors connected in series
RN 75 22 mV VN 75
VN 11 mV
Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use
Appendix E
VIN is that portion of noise voltage that appears across the ampli er input terminal and is _1_ VN according to the voltage divider principle In dBmV, 2 11 10 6 V 20 log ____________ 1 10 3 V 20 log 11 20 2959 10
59 dBmV
This level in dBmV constitutes the so-called noise oor in cable television ampli er cascades
Input Si Ni Output So No
Si Ni So No G
signal input power level noise input power level signal output power level noise output power level gain of ampli er
For the ampli er, the noise factor is given as Si ___ F Ni ___ So ___ No Input signal-to-noise ratio __________________________ Output signal-to-noise ratio
Rewriting, F Since G So /Si Si ___ So Substituting, F No 1 ___ __ Ni G (E-1) 1 __ G Si ___ Ni No No ___ ___ So Ni Si ___ So
The noise power output of an ampli er consists of the input noise level ampli ed G times, plus the noise Nn generated by the ampli er itself Mathematically, No Ni(G) Nn (E-2)
Cascaded Ampli er Theory
Combining Equations E-1 and E-2, F Ni (G) Nn ___________ Ni (G) 1 Nn ______ Ni (G)
(E-3)
Consider a cascade of three ampli ers 1, 2, and 3
Ni G1 GN1 F1 G2 GN2 F2 G3 GN3 F3 No
For the cascade, Fc No ______ Ni(Gc)
where Gc is gain of cascade No noise or power output can be calculated No Ni(G1)(G2)(G3) Cascade of input noise Nn1(G1)(G2) Noise generated by ampli er 1 Nn2(G3) Noise generated by ampli er 2 Nn3 (E-4) Noise generated by ampli er 3
Also, Gc (G1)(G2)(G3) (E-5)
For the cascade, substituting Equation E-3 in Equation E-1, F
i 1 2 3 n1 2 3 n3 ________________________________
N (G )(G )(G )
N (G )(G )
Ni(G1)(G2)(G3)
(E-6)
Rewriting Equation E-6, F and F2 1
n2 _____
n1 _____
N NiG1
n2 __________
N Ni(G1)(G3)
n3 ____________________
N Ni(G1)(G2)(G3)
N NiG2
n3 _____
N NiG3
Rearranging the above for F1, F2, and F3, F1 1
n1 _____
N Ni G1
n2 ____
N 2 Ni G
n3 _____
N Ni G3
Substituting back into Equation E-6, for the cascade F F F1 F2 1 _______ F3 1 _______ G1G2
Appendix E
G1 10 log F
(E-7) (E-8)
where F is the noise gure, in dB Therefore, Equation E-7 for N stages becomes: F F1 F2 1 _______ G1 F3 1 _______ G1G2 Fn 1 ___________ G1G2 Gn
Given: a two-ampli er cascade connected by a piece of cable with its loss equal to an ampli er s gain The cable will generate noise and has negative gain
Stage 1 Stage 2 Stage 3
Cable Amp 1 Amp 2
F1 G1
10 dB 10 dB
F2 G2
10 dB 10 dB
F3 G3
10 dB 10 dB
Typically, F and G are given in dB form, so in order to use Equation E-7, F and G have to be converted to power ratios For ampli er 1, 10 10 log F1 log F1 1 F1 log
Copyright © OnBarcode.com . All rights reserved.