DRAKE DAR8642 Kurzanleitung

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Rack Mount Distribution Amplifiers, with Power Doubled Hybrid Output

DESCRIPTION

The R.L. DRAKE models DAR8642, DAR8633, DAR8618,

DAR7542, and DAR7533, are broadband distribution

amplifiers designed for indoor headend use in both

residential and commercial buildings where RF signal

distribution in the frequency range of 54 to 860 MHz is

required. Each model, except the DAR8618, incorporates a

push-pull hybrid input preamp and a power doubled hybrid

output amplifier to provide a very low distortion signal for

launch amp 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. Only the DAR8618

has a power doubled output hybrid with no input preamp 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 are used for low losses and

maximum reliability.

All DAR 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 unit operates from a nominal 115 VAC, 60 Hz input.

- Input equalizer and fixed attenuator options are available.

INPUT MONITOR

-30 dB

POWER

F1 - POWER LED

This indicator illuminates when power is supplied to the unit.

F2 - INPUT MONITOR

This connector may be used to monitor input to the DAR.

The levels will be 30 dB below the input levels at R3.

F3 - GAIN*

Adjusts the amplifier interstage attenuator.

F4 - SLOPE*

Adjusts the slope of the output signal.

F5 - OUTPUT MONITOR

This connector may be used to monitor the output of the

DAR. Levels will be 30 dB below those present at R2.

R2 must be terminated in 75 Ohms for an accurate reading.

* Not present on models with gain below 20 dB.

DAR DISTRIBUTION AMPLIFIER

GAIN

SLOPE

OUTPUT MONITOR

-30 dB

MIN.

MAX.

MIN.

FLAT