Manual

GENERAL DESCRIPTION
The R170 receiver utilizes a two stage quartz crystal oscillator to assure that the frequency will not drift.
Custom made high Q toroidal filters in the RF and IF stages reject interfering adjacent signals and
provide over 100 dB of image rejection. Dual gate MOS FET semi-conductors in the RF amplifier and
mixer provide excellent sensitivity and resistance to RF overload. A two stage, crystal controlled
oscillator is individually trimmed to the exact operating frequency when each receiver is manufactured
to insure that the frequency will not drift.
The audio section contains a noise reduction "compandor" to suppress audible noise without impairing
the natural dynamics of the audio signal. A 6-pole active filter in the audio path eliminates all
supersonic and subsonic noise in order to increase the compandor tracking accuracy in weak signal
conditions. A time delayed, correlation squelch system is employed in the R170. This circuit is highly
stable and never needs adjustment by the user.
A standard XLR jack provides a balanced 200 Ohm output, variable from -20dBm to -70dBm
(microphone level). A 1/4" phone jack provides a balanced 600 Ohm output, variable from 0dBm to
-50dBm (line level). An RCA phono jack provides a 1K Ohm output at 1 Volt maximum (line level) for
tape recorders or other PA systems. The output level control is a balanced "H" pad attenuator network
using precision resistors. It reduces the output of the XLR and 1/4" jacks, but does not affect the
output of the RCA jack. Noise and distortion are very low and not affected by the setting of the output
level control.
The CH-12 remote DC power supply isolates the R170 receiver audio circuitry from AC ground, which
eliminates ground loops. This also allows the R170 to be powered from external 12 Volt power sources
other than the CH-12 AC adapter.
The R170 receiver is compatible with all Lectrosonics 170 and 185 series transmitters.
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