參數(shù)資料
型號(hào)： S8740190
廠商： Electronic Theatre Controls, Inc.
英文描述： Si Push Pull, 40 - 870MHz, 18.5dB min. Gain @870MHz, 240mA max. @ 24VDC
中文描述： 泗推拉，40 - 870MHz，一十八點(diǎn)五分貝分鐘。增益@ 870MHz，二四零毫安最大。 @ 24Vdc的
文件頁(yè)數(shù)： 2/4頁(yè)
文件大小： 64K
代理商： S8740190
Product Specification
S 8740190
Si Push Pull, 40 – 870MHz, 18.5dB min. Gain @ 870MHz, 240mA max. @ 24VDC
Notes:
Page 2 of 4
2004 Jun 01
Document Revision Level C
1)
The slope is defined as the difference between the ′ideal gain′ at the start frequency and the ′ideal gain′ at the
stop frequency.
The gain flatness is the deviation of any amplitude value from the ideal gain curve calculated by the following
mathematical model: Gain = G + C*SQRT(f
/f
).
G = constant gain (frequency independent); C = cable constant; f
= desired frequency; f
= start frequency. The
cable constant C must be optimized during the flatness determination so that the curve best fits the measured
gain figures. The start value for C is calculated using the formula C
= (G
–G
)/(SQRT(f
n
/f
)-1), where G
= the
measured gain at the stop frequency, G
= the measured gain at the start frequency and f
= stop frequency.
The value of G is chosen so that the max. positive deviation of the measured gain from the ′ideal gain′ curve is
the same as the max. negative deviation. The value of C is adapted by ± 0.001 until the ′ideal gain′ curve best
fits the measured curve. The flatness of the module gain is the maximum deviation in measured gain from the
optimized gain formula.
2)
CHARACTERISTICS
Table 2: Distortion data; V
B
= 24V; T
mb
= 30°C; Z
S
= Z
L
= 75
SYMBOL
PARAMETER
CTB
composite triple beat
CONDITION
79 ch. flat; Vo = 44 dBmV
1)
112 ch. flat; Vo = 44 dBmV
2)
132 ch. flat; Vo = 42 dBmV
3)
79 ch. flat; Vo = 44 dBmV
1)
112 ch. flat; Vo = 44 dBmV
2)
132 ch. flat; Vo = 42 dBmV
3)
79 ch. flat; Vo = 44 dBmV
1)
112 ch. flat; Vo = 44 dBmV
2)
132 ch. flat; Vo = 42 dBmV
3)
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
62.0
59.0
59.0
TYP.
-65.0
-56.0
-56.0
-62.0
-59.0
-61.0
-65.0
-65.0
-62.0
MAX.
-61.0
-54.0
- 53.0
-60.0
-57.0
- 59.0
-62.0
-59.0
- 58.0
-72.0
-65.0
-70.0
-
-
-
UNIT
dBc
XMOD
cross modulation
dBc
CSO
composite second order
distortion
dBc
d
2
second order distortion
4)
5)
6)
dBc
V
0
output voltage
d
im
= -60 dB
7)
d
im
= -60 dB
8)
d
im
= -60 dB
9)
dBmV
Notes:
1)
2)
3)
4)
5)
6)
7)
79 channels, NTSC frequency raster: 55.25 MHz to 547.25 MHz, +44 dBmV flat output level.
112 channels, NTSC frequency raster: 55.25 MHz to 745.25 MHz, +44 dBmV flat output level.
132 channels, NTSC frequency raster: 55.25 MHz to 865.25 MHz, +42 dBmV flat output level.
f
1
= 55.25 MHz; V
1
= 44 dBmV; f
2
= 493.25 MHz; V
2
= 44 dBmV; f
TEST
= f
1
+ f
2
= 548.5 MHz.
f
1
= 55.25 MHz; V
1
= 44 dBmV; f
2
= 691.25 MHz; V
2
= 44 dBmV; f
TEST
= f
1
+ f
2
= 746.5 MHz.
f
1
= 55.25 MHz; V
1
= 44 dBmV; f
= 805.25 MHz; V
2
= 44 dBmV; f
= f
+ f
= 860.5 MHz.
f
1
= 540.25 MHz; V
1
= Vo; f
2
= 547.25 MHz; V
2
= V
o
– 6 dB; f
3
= 549.25 MHz; V
3
= V
o
– 6 dB;
f
TEST
= f
1
+ f
2
- f
3
= 538.25 MHz, according to DIN45004B.
f
1
= Vo; f
= 747.25 MHz; V
= V
– 6 dB; f
3
= 749.25 MHz; V
3
= V
o
– 6 dB;
f
TEST
= f
1
+ f
2
- f
3
= 738.25 MHz, according to DIN45004B.
f
1
= 851.25 MHz; V
= Vo; f
= 858.25 MHz; V
= V
– 6 dB; f
3
= 860.25 MHz; V
3
= V
o
– 6 dB;
f
TEST
= f
1
+ f
2
- f
3
= 849.25 MHz, according to DIN45004B.
8)
9)
Composite Second Order (CSO)
The CSO parameter (both sum and difference products) is defined by the NCTA.
Composite Triple Beat (CTB)
The CTB parameter is defined by the NCTA.
Cross Modulation (XMOD)
Cross modulation (XMOD) is measured at baseband (selective voltmeter method), referenced to 100% modulation of the
carrier being tested.
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