Fundamentals of Digital Television Transmission phần 10 doc
Fundamentals of Digital Television Transmission phần 10 doc
... R275
40.00
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90.00
95.00
10 20 30 40 50 60 70 80 90 100 110
Filed strength (dBu)
Distance (km)
Calculated
Measured
Figure 8-34. Field strength versus distance.
Fundamentals of Digital Television Transmission. ... 70,
bandpass, 99, 116
band-reject, 100
channel, 73, 98, 99, 101 , 102
constant impedance, 99, 100
digital, 70,...
Fundamentals of Digital Television Transmission phần 1 doc
... originality for much of the material included in
this book. In fact, the story of digital television builds on the many contributions
of workers since the beginning of radio and television transmission. ... Services
Digital Broadcasting (ISDB-T),” ITU Document 11A/Jxx-E, March 30, 1999.
3
The upper and lower channel edges occupy the bandwidth of the remaining OFDM segment....
Fundamentals of Digital Television Transmission phần 8 docx
... factor.
Modification of the radiation resistance of a dipole in the presence of a ground
plane is equivalent to the effect of the mutual impedance of a pair of parallel
dipoles driven out of phase by ... sake of illustration, the results of
calculation of the mutual impedance of parallel half-wavelength dipoles as a func-
tion of separation are plotted in Figure 7-35. N...
Fundamentals of Digital Television Transmission phần 2 pptx
... floor (dBm) 79.0 89.8 96.9
Minimum receiver power (dBm) 63.8 74.6 81.7
1
10
100
100 0
100 00
100 000
100 0000
10 100 100 0
Noise temperature (K)
Frequency (MHz)
Rural Suburban
Figure 2-1. External ... effect of antenna noise temperature, T
a
,
6
Transmission Performance of ISDB-T,” ITU-R Document 11A/Jyy-E, May 14, 1999.
7
Yiyan Wu, “Performance Comparison of ATSC 8-VSB...
Fundamentals of Digital Television Transmission phần 3 pot
... performance of
a space communications channel for three cases: with concatenated codes, trellis
10
−1
10
−2
10
−3
10
−4
10
−5
10
−6
(7, 1/2) code
(Voyager)
−2 10 1 2 3 4 5 6 7 8 9 101 1
Bit error ... systems support a wide range of payload bit rates.
The average transmitter power is much less than that required for analog TV
transmission.
Fundamentals of Digital Tele...
Fundamentals of Digital Television Transmission phần 5 pot
... 0 .100
18 497 95.36 0 .101
19 503 94.66 0 .101
20 509 93.96 0 .102
21 515 93.28 0 .103
22 521 92.61 0 .104
23 527 91.96 0 .104
24 533 91.31 0 .105
25 539 90.68 0 .106
26 545 90.06 0 .107
27 551 89.44 0 .107
28 ... line length is 100 0 ft, AERP of 100 0 kW can be achieved with a gain of 30
up to U.S. channel 43. Alternatively, AERP of 100 0 kW may be supported with
8
3
16
-...
Fundamentals of Digital Television Transmission phần 6 potx
... 144 TRANSMISSION LINE FOR DIGITAL TELEVISION
POWER RATING
For all practical purposes, the average power rating of waveguide may be
considered “unlimited” for digital television applications. ... independent of frequency.
15
This is above
the TPO of all currently available digital television transmitters. Thus, waveguide
may be selected on the basis of channel and desired...
Fundamentals of Digital Television Transmission phần 7 pot
... excitation of the upper and lower halves of
SLOTTED CYLINDER ANTENNAS 181
f = 0°
f=270°
f=180°
f=90°
10
5
D
/l = .0637
f = 0°
f=270°
f=180°
f=90°
10
5
D
/l = .1 910
f = 0°
f=270°
f=180°
f=90°
10
5
D
/l ... an increasing number of slots around
the cylinder.
158 TRANSMITTING ANTENNAS FOR DIGITAL TELEVISION
Uniform end fed array
−40
−30
−20
10
0
10
20
30
40
50
−6 −4 −2
0246...
Fundamentals of Digital Television Transmission phần 9 potx
... loss of about 16 dB. The overall roughness of
R085 is approximately twice as great over much of the distance. The roughness
of R 110 is intermediate to R085 and R215. The measured field for R 110 ... Summary of the Grand Alliance VSB Transmission System Field Test in Char-
lotte, N.C., June 3, 1996, App. C.
240 RADIO-WAVE PROPAGATION
−25
−20
−15
10
−5
0
5
10 20 30 40 50 60 70...
Fundamentals of Finite Element Analysis phần 10 doc
... 30 (10
6
)
psi and the cross-sectional area is 1.2 in.
2
Problem E3.1
3 ft
100 0 lb
100 0 lb
100 0 lb
100 0 lb1000 lb
500 lb
2
3
5
7
9
11
46 8101 2
1
3 ft 3 ft 3 ft 3 ft 3 ft
6 ft
500 lb
Hutton: Fundamentals ... a number of submatrices of
lower order. The concept of matrix partitioning is most useful in reducing the
size of a system of equations and accounting for specified va...
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