Cisco 1218 MHz GainMaker High-Gain Balanced Triple System Amplifier Data Sheet
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Consumer bandwidth demand continues to grow at a rapid rate every year. As a result, cable operators with DOCSIS-based equipment will need to future proof their networks. They want to plan for reduced service-group sizes and ultimately double or quadruple (or more) bandwidth speeds. The Cisco 1218 MHz GainMaker® High Gain Balanced Triple (HGBT) System Amplifier helps to make these demands a reality. The Cisco 1218 MHz HGBT amplifier provides three high-level forward RF outputs (main and two auxiliary).
Cisco 1218 MHz GainMaker system amplifier modules have increased gain to allow drop in for 750, 870, and 1002 MHz spacing, and are mechanically compatible with previous Cisco GainMaker, System Amplifier II, II+, and III housing bases, often allowing upgrades to higher bandwidth with no respacing or resplicing. The DC power supply is modular and located in an updated housing lid for easy access. All Cisco 1.2 GHz GainMaker system amplifier modules are factory configured with reverse amplifier, diplex filters, thermal compensation circuit, forward interstage pads, and equalizer to promote optimal performance. Optional single-pilot Automatic Gain Control (AGC) configurations are also available.
● High-performance Gallium Nitride (GaN) gain stage technology.
● Plug-in accessories that are common to all Cisco 1218 MHz GainMaker amps and Cisco GS7000 products (that is, attenuator pads, diplexers, and crowbar).
● Amplifier housing that provides access to RF test points without opening the housing.
● Spring-loaded seizure assemblies allow coaxial connectors to be installed or removed without removing amplifier RF module.
● Power supply mounted in housing lid for efficient thermal dissipation (60- and 90-VAC powering capability).
● 15A current capacity (steady state) and 25A surge survivability.
● Quadrature Amplitude Modulation (QAM) pilot AGC available (optional).
● AGC with thermal backup, which eliminates disruptive RF output variation in the event of pilot loss.
● Reverse input pad and RF test point for each reverse input port to allow optimum reverse path design and alignment.
● Surge-resistant circuitry that helps ensure gain stage protection without fuses or other failure-causing devices.
Block Diagram – 1.2 GHz High Gain Balanced Triple Amplifier
Table 1. General Station Performance
| General Station Performance |
Units |
Forward |
Reverse |
Notes |
| Pass band |
MHz |
54-1218 |
5-204 |
|
| Amplifier type |
- |
GaN |
GaAs HBT |
|
| Frequency response |
dB |
± 0.5 |
|
|
| Auto slope and gain range |
dB |
± 5.8 |
- |
|
| Return loss |
dB |
16 |
16 |
7 |
| Maximum AC through current (continuous) |
Amps |
15 |
- |
|
| Maximum AC through current (surge) |
Amps |
25 |
- |
|
| Hum modulation at 12A (over specified frequency range) |
dB |
70 (54-870 MHz) 60 (870-1218 MHz) |
60 (5-25 MHz) 70 (25-42 MHz) |
|
| Hum modulation at 15A (over specified frequency range) |
dB |
65 (54-870 MHz) 60 (870-1218 MHz) |
60 (5-25 MHz) 65 (25-42 MHz) |
|
| Test points (± 0.75 dB) |
dB |
-20 |
-20 |
|
| Reference output level at 1218 MHz 1002 MHz 870 MHz 750 MHz 650 MHz 550 MHz 258 MHz 105 MHz 86 MHz 54 MHz |
dBmV |
58.0 54.7 52.7 50.8 49.3 47.8 43.3 41.0 40.7 40.2 |
35 (at 42 MHz)
35 (at 5 MHz) |
|
| Reference output tilt (54-1218 MHz) (86-1218 MHz) (105-1218 MHz) (258-1218 MHz) |
dB |
17.8 17.3 17.0 14.7 |
- |
1 |
Table 2. Forward Station Performance
| Forward Station Performance |
Units |
Auto/Thermal with 12 dB I/S EQ |
Notes |
| Operational gain (minimum) |
dB |
46 |
2 |
| Internal tilt (± 0.5 dB) @ 54 – 1218 MHz |
dB |
19.0 |
3 |
| Noise figure at 54, 86, 105, 258 MHz |
dB |
8.5 |
2 |
| Noise figure at 1 218MHz |
dB |
8.0 |
2 |
| Composite triple beat |
dBc |
66 |
4,9 |
| Cross modulation |
dBc |
63 |
4,5,9 |
| Composite second order (high side) |
dBc |
66 |
4,9 |
| Composite intermodulation noise (CIN) |
dBc |
50 |
4,8,9,10 |
Table 3. Reverse Station Performance
| Reverse Station Performance |
Units |
|
Notes |
| Operational gain (minimum) @ 42 MHz @ 65 MHz @ 85 MHz @ 204 MHz |
dB |
21.6 22.7 23.8 27.2 |
6,7 |
| Internal tilt (± 0.5 dB) |
dB |
0 |
3 |
| Noise figure |
dB |
11.0 |
6,7 |
| NPR at 50dB CNR at 42 MHz NPR at 50dB CNR at 65 MHz NPR at 50dB CNR at 85 MHz NPR at 50dB CNR at 204 MHz |
dB |
20 19 15 11.5 |
|
Table 4. Station Delay Characteristics
| Station Delay Characteristics (42/54 Split) |
|||
| Forward (Chrominance to Luminance Delay) |
Reverse (Group Delay in 1.5 MHz bandwidth) |
||
| Frequency (MHz) |
Delay (ns) |
Frequency (MHz) |
Delay (ns) |
| 55.25 to 58.83 |
39 |
5.0 to 6.5 |
60 |
| 61.25 to 64.83 |
25 |
6.5 to 8.0 |
22 |
| 67.25 to 70.83 |
17 |
8.0 to 9.5 |
12 |
| 77.25 to 80.83 |
10 |
37.5 to 39.0 |
20 |
|
|
|
39.0 to 40.5 |
32 |
|
|
|
40.5 to 42.0 |
50 |
| Station Delay Characteristics (65/86 Split) |
|||
| Forward (Chrominance to Luminance Delay) |
Reverse (Group Delay in 1.5 MHz bandwidth) |
||
| Frequency (MHz) |
Delay (ns) |
Frequency (MHz) |
Delay (ns) |
| 112.25 - 116.68 |
8 |
5.0 to 6.5 |
60 |
| 119.25 - 123.68 |
7 |
6.5 to 8.0 |
22 |
| 126.25 - 130.68 |
6 |
8.0 to 9.5 |
12 |
| 133.25 - 137.68 |
6 |
60.5 – 62.0 |
10 |
|
|
|
62.0 – 63.5 |
17 |
|
|
|
63.5 – 65.0 |
21 |
| Station Delay Characteristics (85/102 Split) |
|||
| Forward (Chrominance to Luminance Delay) |
Reverse (Group Delay in 1.5 MHz bandwidth) |
||
| Frequency (MHz) |
Delay (ns) |
Frequency (MHz) |
Delay (ns) |
| 109.275 - 112.855 |
25 |
5.0 to 6.5 |
60 |
| 115.275 - 118.855 |
15 |
6.5 to 8.0 |
22 |
| 121.2625 - 124.8425 |
10 |
8.0 to 9.5 |
12 |
| 127.2625 - 130.8425 |
5 |
80.5 – 82.0 |
10 |
|
|
|
82.0 – 83.5 |
17 |
|
|
|
83.5 – 85.0 |
21 |
| Station Delay Characteristics (204/258 Split) |
|||
| Forward (Chrominance to Luminance Delay) |
Reverse (Group Delay in 1.5 MHz bandwidth) |
||
| Frequency (MHz) |
Delay (ns) |
Frequency (MHz) |
Delay (ns) |
| 259.2625 - 262.8425 |
10 |
5.0 to 6.5 |
60 |
| 265.2625 - 268.8425 |
8 |
6.5 to 8.0 |
22 |
| 271.2625 - 274.8425 |
7 |
8.0 to 9.5 |
12 |
| 277.2625 - 280.8425 |
5 |
199.5 -201.0 |
6 |
|
|
|
201.0-202.5 |
5 |
|
|
|
202.5-204.0 |
8 |
Table 5. Station Powering Data
| Station Powering Data |
||||||||||||||
| Cisco GainMaker HGBT System Amplifier |
I DC |
|
AC Voltage |
|||||||||||
| 90 |
85 |
80 |
75 |
70 |
65 |
60 |
55 |
50 |
45 |
40 |
35 |
|||
| Thermal |
1.85 |
AC current (A) |
0.66 |
0.68 |
0.72 |
0.73 |
0.76 |
0.81 |
0.87 |
0.94 |
1.04 |
1.18 |
1.35 |
1.61 |
| Power (W) |
49.0 |
48.7 |
48.2 |
48.1 |
47.8 |
47.6 |
47.6 |
47.5 |
47.5 |
47.6 |
47.5 |
47.9 |
||
| AGC |
1.90 |
AC current (A) |
0.67 |
0.69 |
0.73 |
0.74 |
0.77 |
0.82 |
0.89 |
0.97 |
1.07 |
1.21 |
1.38 |
1.64 |
| Power (W) |
50.1 |
49.7 |
49.3 |
49.2 |
48.9 |
48.6 |
48.6 |
48.6 |
48.6 |
48.6 |
48.8 |
49.0 |
||
Data is based on stations configured for two-way operation. AC currents specified are based on measurements made with typical CATV type ferroresonant AC power supply (quasi-square wave), and Cisco GainMaker High Output System Amplifier power supply (2.5A, 24 VDC, part number 4022846).
DC supply has a user configurable 30V, 40V, or 50 VAC under voltage lockout circuit. Default setting is 30V, 40V, or 50 VAC. Under-voltage lockout may be selected by changing the position of the lockout jumper.
Note:
1. Reference output tilt is specified as “LINEAR” tilt (as opposed to “cable” tilt).
2. Forward gain and noise figure measured with 0 dB input EQ and 1 dB input pad.
3. Down tilt, the effect of cable, is represented by a negative sign (-). Up tilt, the effect of equalization, is represented by a plus sign (+).
4. Mixed loading of 79 analog channels (54–554MHz) and SC-QAM’s (554–1218MHz) with 6 dB backoff.
5. X-mod (at 15.75 kHz) specified using 100 percent synchronous modulation and frequency selective measurement device.
6. Reverse gain and noise figure for station with 0 dB reverse input pad, 0 dB reverse output EQ, and 1 dB output pad.
7. Reverse operational gain, noise figure, and return loss are specified without reverse switch option. If switch is installed, reduce gain by 0.5 dB, increase noise figure by 0.5 dB, and decrease return loss by 1 dB.
8. Composite intermodulation noise is a broadband noise-like distortion product associated with QAM loading.
9. Distortion performance at reference output levels and tilt. Contact Cisco Engineering for CIN calculation.
10. CIN spec number is the same for both all QAM and mixed analog loading.
Table 6. Physical Specifications
| Environmental |
|
| Operating temperature range |
-40 - 140°F (-40 - 60°C) |
| Mechanical |
|
| Housing dimensions (L x H x D) |
17.3 in. x 7.2 in. x 7.8 in. (439.4 mm x 182.9 mm x 198.1 mm) |
| Weight
● Housing with power supply
● Module
|
12 lb, 5 oz (5.6 kg) 5 lb, 5 oz (2.4 kg) |
The Cisco GainMaker HGBT System Amplifier is available in a wide variety of configurations. Table 7 contains the configured PIDs for the High Gain Balanced Triple Amplifiers. Table 8 and Table 9 contain ordering information for required and optional accessories. Consult with your Cisco account representative, customer service representative, or system engineer to determine the best configuration for your particular application.
Table 7. Cisco GainMaker High Gain Balanced Triple (HGD) Amp Configurations
| Cisco GainMaker 1.2-GHz HGD Amp Configurations |
Part Number for Ordering |
| 42/54 MHz Split |
|
| GMSA 1.2 GHz, HGBT,42/54, CB, PS, CTD HSG, TPA, Thermal |
GMSATS4THXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,42/54, CB, Launch Amp, Thermal |
GMSATS4TXXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,42/54, CB, PS, CTD HSG, TPA, QAM AGC 711 MHz |
GMSATS45HXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,42/54, CB, Launch Amp, QAM AGC 711 MHz |
GMSATS45XXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,65/86, CB, PS, CTD HSG, TPA, Thermal |
GMSATS6THXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,65/86, CB, Launch Amp, Thermal |
GMSATS6TXXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,65/86, CB, PS, CTD HSG, TPA, QAM AGC 711 MHz |
GMSATS65HXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,65/86, CB, Launch Amp, QAM AGC 711 MHz |
GMSATS65XXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,85/102, CB, PS, CTD HSG, TPA, Thermal |
GMSATS8THXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,85/102, CB, Launch Amp, Thermal |
GMSATS8TXXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,85/102, CB, PS, CTD HSG, TPA, QAM AGC 711 MHz |
GMSATS85HXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,85/102, CB, Launch Amp, QAM AGC 711 MHz |
GMSATS85XXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,204/258, CB, PS, CTD HSG, TPA, Thermal |
GMSATS2THXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,204/258, CB, Launch Amp, Thermal |
GMSATS2TXXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,204/258, CB, PS, CTD HSG, TPA, QAM AGC 711 MHz |
GMSATS25HXXXXXXXXX |
| GMSA 1.2 GHz, HGBT,204/258, CB, Launch Amp, QAM AGC 711 MHz |
GMSATS25XXXXXXXXXX |
Table 8. Required Accessories
| Required Accessories |
Part Number |
| Plug-in Pads (attenuators): Available in 1.0 dB steps from 0 to 20 dB
● 1 required for forward input
● 1 required for AGC, if applicable
*
● 4 required for reverse (3 input, 1 output)
*To determine AGC pad value, subtract 34 dB from the design value main port RF output level at the AGC pilot frequency. |
GM-PAD-1.2G-00= and GM-PAD-1.2G-1.0 sequentially through GM-PAD-1.2G-20.0= |
| Plug-in Forward Cable Equalizer: Available in 1.5 dB steps from 0 to 30 dB at 1002 MHz
● 1 required for forward input
|
GM-EQC-1.2G-0= and GM-EQC-1.2G-1.5 sequentially through GM-EQC-1.2G-30= |
| Plug-in Reverse Cable Equalizer: Available in 1 dB steps from 0 to 12 dB at 42 MHz
● 1 required for reverse output, unless design value is 0 dB (0 dB EQ is provided)
|
712719 (0 dB) and 589628 (1dB) sequentially thru 589639 (12 dB) – 40 MHz 589736 (1 dB) sequentially thru 589747 (12 dB) – 65 MHz 4036769 (1 dB) sequentially thru 4036780 (12 dB) – 85 MHz GM-EQREV-204M-1= (1 dB) sequentially thru GM-EQREV-204M-12= (12 dB) – 204 MHz |
The optional accessories listed in Table 9 can be ordered separately.
Table 9. Optional Accessories
| Optional Accessories |
Part Number |
| 24V Power Supply for Cisco GainMaker HGD |
4026157 |
| 230 VAC Crowbar Surge Protector (plug-in, one per station) |
715973 |
| Plug-in Inverse Equalizer: Simulates cable equivalent tilts (creates tilt opposite that of equalizers). Use in place of forward input EQ as needed to maintain proper output tilt in short spaced locations. Available in 1.5dB cable-equivalent steps from 1.5 to 21.0dB |
GM-EQIN-1.2G-1.5= sequentially thru GM-EQIN-1.2G-21= |
| Long Reach Test Point Adapter |
562580 |
| Cisco GainMaker SA HGBT Split Kit 85/102 MHz (PKG OF 10) |
GMSA-SKT-1.2G-85= |
| Cisco GainMaker SA HGBT Split Kit 204/258 MHz (PKG OF 10) |
GMSA-SKT-1.2G-204= |
| Cisco GainMaker 1.2 GHz Amplifier Housing |
GMSA-HSG-1.2G= |
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