Техническая Спецификация для Cisco Cisco Legacy RF Accessories
Notes:
(1) Reference output tilt is specified as “LINEAR” tilt (as opposed to traditional “cable” tilt).
(2) Down tilt, the effect of cable, is represented by a (-). Up tilt, the effect of equalization, is represented by a (+).
(3) Forward gain and noise figure measured with 0 dB input EQ and 1 dB input pad.
(4) “Digital” refers to 550-750 MHz loading with 33 QAM carriers at -6 dB levels relative to analog video carrier levels.
(5) CTB and CSO measured using CW carriers, with spectrum analyzer as the measurement device.
(6) X-Mod (@ 15.75 kHz) specified using 100% synchronous modulation and frequency selective measurement device.
(7) Distortions and Noise Figures are typical and specified over the operational temperature range.
(8) Reverse output reference level with a 0 dB reverse output equalizer and factory selected reverse output pad.
(9) Reverse gain and noise figure is for station with 0 dB reverse input pad, 0 dB reverse output EQ, and factory-selected reverse output pad.
(1) Reference output tilt is specified as “LINEAR” tilt (as opposed to traditional “cable” tilt).
(2) Down tilt, the effect of cable, is represented by a (-). Up tilt, the effect of equalization, is represented by a (+).
(3) Forward gain and noise figure measured with 0 dB input EQ and 1 dB input pad.
(4) “Digital” refers to 550-750 MHz loading with 33 QAM carriers at -6 dB levels relative to analog video carrier levels.
(5) CTB and CSO measured using CW carriers, with spectrum analyzer as the measurement device.
(6) X-Mod (@ 15.75 kHz) specified using 100% synchronous modulation and frequency selective measurement device.
(7) Distortions and Noise Figures are typical and specified over the operational temperature range.
(8) Reverse output reference level with a 0 dB reverse output equalizer and factory selected reverse output pad.
(9) Reverse gain and noise figure is for station with 0 dB reverse input pad, 0 dB reverse output EQ, and factory-selected reverse output pad.
Unless otherwise noted, the above specifications reflect typical station performance at stated reference levels in the recommended operating configuration,
including the input equalizer and reverse filters where applicable. Unless otherwise noted, specifications are based on measurements made in accordance
with NCTA Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 68
including the input equalizer and reverse filters where applicable. Unless otherwise noted, specifications are based on measurements made in accordance
with NCTA Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 68
°
F (20
°
C).
Units
Forward
Reverse
Pass Band
MHz
52-750
5-40
Amplifier Type
---
PHD
PP
Operational Temperature Range
degrees
-40 to +140 F
-40 to +140 F
Frequency Response
dB
±0.5
±0.5
Auto Slope & Gain Range
dB
±4
N/A
Return Loss
dB
16
16
Operational AC Through Current
Amps
15
N/A
Max AC Through Current (2 hrs)
Amps
25
N/A
Hum Modulation @ 10 A
dB
66 (55-750 MHz)
60 (5-15 MHz)
(over specified frequency range)
70 (16-40 MHz)
Hum Modulation @ 15 A
dB
56 (55-150 MHz)
50 (5-15 MHz)
(over specified frequency range)
59 (151-600 MHz)
58 (16-40 MHz)
55 (601-750 MHz)
Current Draw @ 24 V DC
Amps
1.37
0.09
Test Points (±0.5 dB)
dB
-20
-20
Interstage Equalizer (value - type)
dB
16.5 - fixed
N/A
Interstage Level Control (type)
AGC w/ manual temp backoff
N/A
Operational Gain (minimum)
3, 9
dB
37
19
Internal Tilt
2
(±0.5 dB)
dB
+12.5
0
Noise Figure
3,7
@ 54 MHz
dB
10.5
N/A
Noise Figure
3,7
@ 750 MHz
dB
10
N/A
Reverse Noise Figure
7, 9
dB
N/A
10
Reference Output Level–High Freq.
dBmV
47.5 @ 750 MHz
35 @ 40 MHz
8
44 @ 550 MHz
Reference Output Level–Low Freq.
dBmV
35 @ 54 MHz
35 @ 5 MHz
8
Reference Output Tilt
1,2
dB
+12.5
0
Units
Forward
Reverse
CW Channel Loading
NTSC
79 w/ digital
4
6
Composite Triple Beat
5,7
dB
70
92
Cross Modulation
6,7
dB
68
80
Composite Second Order
5,7
(high side)
dB
64
82
TYPE 2A-2 SYSTEM AMPLIFIER III – 5-40/52-750 MHz
General Station Performance Data
Forward and Reverse Performance with Specified Channel Loading
Delay Characteristics
Forward
Reverse
(Chrominance to Luminance Delay)
(Group Delay in 1.5 MHz BW)
Freq. (MHz)
Delay (ns)
Freq. (MHz)
Delay (ns)
55.25 - 58.83
27
38.5 - 40.0
33
61.25 - 64.83
12
33.5 - 35.0
9
67.25 - 70.83
7
10.0 - 11.5
6
77.25 - 80.83
3
5.0 - 6.5
60