DRAKE DAR8642 Quick Manual

Rack Mount Distribution Amplifiers, with Power Doubled Hybrid Output
®
G A
MIN.
INPUT
MONITOR
-20 dB
F2 F3
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 47 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 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.
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 100-240 VAC, 50/60 Hz input.
N I S L O P E
MAX. MIN. FLAT
F4
POWER
OUTPUT
MONITOR
-20 dB
F5 F1
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 20 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 20 dB below those present at R2.
R2 must be terminated in 75 Ohms for an accurate reading.
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DAR DISTRIBUTION AMPLIFIER