GainMaker 1002 MHz High Output High Gain Dual (HGD) System Amplifier 5-85/105-1002 MHz Data Sheet

The Cisco GainMaker^® broadband amplifier platform includes a variety of RF amplifiers that address the divergent needs of today’s broadband networks. All GainMaker amplifiers provide superior two-way performance and reliability combined with a user-friendly layout. All share common plug-in accessories and now perform to 1 GHz in the forward path. The System Amplifiers in this family provide multiple forward RF output ports, while the Line Extenders provide a single forward RF output port.

GainMaker System Amplifiers use gallium arsenic field-effect transistor (GaAsFET) technology in the interstage and output gain stages for improved distortion performance.

The GainMaker High Output System Amplifier modules are capable of higher output levels than standard GainMaker System Amplifier modules, and are mechanically compatible with previous System Amplifier II, II+, III, and GainMaker housing bases. The DC power supply is modular and located in an updated housing lid for easy access. All GainMaker System Amplifier modules are factory configured with reverse amplifier, diplex filters, thermal compensation circuit, forward interstage pads, and interstage equalizer to help ensure optimal performance. Optional single-pilot Automatic Gain Control (AGC) configurations are also available.

The GainMaker High Output High Gain Dual (HGD) System Amplifier is ideally suited for providing high (bridger) level RF to the feeder network (Figure 1). It provides two forward RF outputs (main and auxiliary), with the option to create a third RF output using an optional plug-in auxiliary path signal director.

Features

●   Capable of higher output levels than standard output 1-GHz GainMaker amplifiers

●   Common RF test points for forward output and reverse injection simplify reverse balancing

●   Increased forward gain to facilitate drop-in bandwidth extensions without respacing

●   High-performance GaAsFET gain stage technology

●   Fixed-value, plug-in accessories are common to all GainMaker products

●   60V and 90V AC powering capability

●   15A current capacity (steady state) and 25A surge survivability

●   AGC has Thermal backup, which eliminates disruptive RF output variation in the event of pilot loss

●   Quadrature amplitude modulation (QAM) pilot AGC now available in addition to existing analog carrier AGCs

●   Improved hum modulation

●   Plug-in, self-contained diplex filters

●   Modular high-efficiency power supply allows simplified maintenance

●   Reverse input pad and RF test point for each reverse input port allow optimum reverse path design and alignment

●   Directional Coupler RF test points provide best accuracy

●   Surge-resistant circuitry helps ensure gain stage protection without fuses or other nuisance failure-causing devices

Figure 2 shows a block diagram of the HGD system amplifier.

Specifications

Tables 1 through 6 list the specifications for the Cisco GainMaker 1002 MHz High Output HGD System Amplifier 5-85/105-1002 MHz.

Table 1.       General Station Performance

Table 2.       Forward Station Performance

Table 3.       Reverse Station Performance

Unless otherwise noted, specifications reflect typical performance and are referenced to 68°F (20°C). Specifications are based upon measurements made in accordance with SCTE/ANSI standards (where applicable), using standard frequency assignments.

Table 4.       Station Delay Characteristics

Table 5.       Station Powering Data

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 GainMaker High Output System Amplifier power supply (2.5A, 24V DC, pn 4022846).

DC supply has a user-configurable 30V, 40V, or 50V AC under-voltage lockout circuit. Default setting is 30V. 40V or 50V AC under-voltage lockout may be selected by changing the position of the lockout jumper.

Notes:

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 (-). Up tilt, the effect of equalization, is represented by a (+).

4.     73 CW NTSC channels loaded from 115 to 550 MHz. Digital refers to 550–1002 MHz loading with QAM carriers at -6 dB levels relative to analog video carrier levels.

5.     X-mod (@ 15.75 kHz) specified using 100% 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.

Table 6.       Environmental and Mechanical Specifications

Ordering Information

The GainMaker Ordering Matrix provides ordering information for configured amplifier modules or stations. This section contains ordering information for required and optional accessories that are not included as part of a configured amplifier module or station. Consult your account representative or customer service representative for ordering assistance.

The required accessories listed in Table 7 must be ordered separately (they are not included via the GainMaker Ordering Matrix).

Table 7.       Required Accessories

The following optional accessories listed in Table 8 may be ordered separately:

Table 8.       Optional Accessories

The housing options listed in Table 9 may be included with the product if ordered using the GainMaker Ordering Matrix. They may also be ordered separately.

Table 9.       Housing Options