Lectrosonics CR170 - Manual (Page 3)

GENERAL TECHNICAL DESCRIPTION
The CR170 receiver employs a two stage, crystal controlled oscillator, individually trimmed to the exact operating
frequency, to ensure that the frequency will not drift. This eliminates the need for "tuning" adjustments each time
the receiver is used. Numerous frequencies are available from 150 MHz through 216 MHz.
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.
The audio section contains a noise reduction "compandor" to suppress audible noise (hiss) 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 CR170. This circuit is highly stable and never needs adjustment by the user.
A recessed level control knob adjusts the audio output from microphone level to line level. Since the audio input
level requirements vary from one VCR or sound system to another, this control is continuously variable which
allows the receiver audio output to be perfectly matched to the audio input of any type of recording or PA
equipment.
The receiver may be powered from an internal 9 Volt battery, external 12 Volt DC or from 110 Volts AC using the
supplied charger. The battery compartment will accept any brand of 9 Volt alkaline or lithium battery. A unique,
floating polarity barrier prevents inserting the battery backward and will automatically adjust itself to accommodate
varies lengths of batteries.
The CR170 receiver is compatible with all Lectrosonics 185 series high band transmitters.
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