Professional Rack Mounted
Power Doubling Distribution Amplifiers
The R.L. Drake model DAR8642, DAR8633, DAR8618, DAR7542, and DAR7533 broadband distribution amplifiers are designed for indoor headend use in both residential and commercial buildings where RF signal distribution in the frequency range of 54 to 750 or 860 MHz is required.
Each model incorporates a push-pull hybrid input preamp (except the DAR8618) and a power doubled hybrid output amplifier to provide a very low distortion signal for launch amplifier applications in the output of an SMATV or CATV headend. The Gain and Slope controls both have a range of 10 dB minimum and operate between the preamp hybrid and the output hybrid to maintain a low noise figure over a wide range of gain and slope settings. The DAR8618 has a power doubled output hybrid with no input preamplifier and no adjustable gain and slope controls.
All models have a provision for optional fixed input attenuators and equalizers.
Double-sided, plated through hole, glass epoxy printed circuit boards, and SMT construction are used for low losses and maximum reliability.
All DAR series models include a built-in diplexer filter. This allows the return path energy that is present at the output port of the DAR to be separated from the DAR output and passed to the return path output port.
Input and output test connectors are provided for convenient monitoring of the signal path. The amplifier circuitry is designed for maximum stability, low distortion, low noise figure, and is protected in a rugged aluminum housing.
The units operate from a nominal 120 VAC, 60 Hz AC Input.
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Specifications for specific models |
DAR8642 | DAR8633 | DAR8618 | DAR7542 | DAR7533 |
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Frequency Coverage
(forward path): |
54 to 860 MHz. | 54 to 860 MHz. | 54 to 860 MHz. | 54 to 750 MHz. | 54 to 750 MHz. |
| Gain: | 42 dB. | 33 dB. | 18 dB. | 42 dB. | 33 dB. |
| Noise Figure: | 7 dB maximum. | 7.5 dB maximum. | 7.5 dB maximum. | 6.5 dB maximum. | 7 dB maximum. |
| Channel Loading: | 129 channels | 129 channels | 129 channels | 110 channels | 110 channels |
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Output Level (max. per channel for specified distortion): |
+40 dBmV. | +40 dBmV. | +40 dBmV. | +44 dBmV. | +44 dBmV. |
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Input Level (maximum without using fixed input attenuator): |
+7 dBmV. | +18 dBmV. | +22 dBmV. | +10 dBmV. | +20 dBmV. |
| Optimum Input Level Range: |
-3 dBmV to +2 dBmV. |
+7 dBmV to +12 dBmV. |
N/A |
+0 dBmV to +5 dBmV. |
+10 dBmV to +15 dBmV. |
| Forward Path Nonlinear Distortions | |||||
| Composite Triple Beat: | - 60 dB. | - 60 dB. | - 61 dB. | - 58 dB. | - 58 dB. |
| Composite Second Order: | - 60 dB. | - 60 dB. | - 60 dB. | - 58 dB. | - 58 dB. |
| Cross-modulation: | - 64 dB. | - 64 dB. | - 68 dB. | - 60 dB. | - 60 dB. |
| Specifications common to all models: | |||||
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Forward Gain Adjustment Range (except DAR8618): |
10 dB minimum. | ||||
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Slope Control Adjustment (54 MHz)
(except DAR8618): |
10 dB minimum. | ||||
| Input/Output Impedances: | 75 Ohms. | ||||
| Input Return Loss: | 14 dB. | ||||
| Monitor Port Levels, Input and Output: |
- 30 dB. | ||||
| Fixed Input Attenuator: | Plug-in (SXP type) available. | ||||
| Fixed Input Equalizer: | Plug-in (QSA type) available. | ||||
| Hum Modulation: | - 70 dB. | ||||
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Frequency Coverage (return port): |
5 to 42 MHz. | ||||
| RF Shielding: | Leakage complies with FCC Part 76. | ||||
| Power Requirement: | 115 VAC, 60 Hz, 24 Watts (Model DAR8618 - 18 Watts) | ||||
| Operating Temperature Range: | - 20° to + 60° C. | ||||
| Size: | 19" (48.3 cm) W x 7.5" (19.1 cm) L x 1.75" (4.5 cm) D | ||||
| Weight: | 6 lbs. 4 oz. (2.9 Kg). | ||||
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R.L. Drake, LLC |
Sales: 937-746-4556 |
