Ratio Diversity Receiver
FRONT PANEL CONTROLS AND FUNCTIONS
MODULATION INDICATORS Two (2) LEDs indicate the audio level (modulation) of the incoming signal, which are
typically used for proper adjustment of the transmitter’s “MIC LEVEL” or “GAIN”. The -20 LED (green) lights during
normal modulation. The 0dB (red) LED indicates maximum modulation and that the transmitter audio input may be
“limiting.” Occasional flickering of this LED is normal. It should not stay on for long periods, however.
OFF/ON This switch turns the receiver power off and on.
CODE Lights when the transmitter is turned on and the internal code in the transmitter matches this particular
receiver. If the receiver is turned on after the transmitter, the code led will not come on. In this case, it will be neces-
sary to turn the transmitter off and back on to enable the receiver. When the carrier signal from the transmitter is too
weak to produce a clean audio signal the receiver will squelch (no audio) but the code lamp will remain lit.
OPTI-BLEND LEDs The audio outputs of two separate receivers are mixed together in a “ratio” that is regulated by
comparing the signal to noise ratios in the two receivers. The mixture ratio of the two audio signals is indicated on the
front panel by two LEDs that vary in brightness. As a build-up of noise occurs in one receiver, the corresponding LED
for that receiver dims or goes out as the circuitry pans to the other receiver. Since the mixture ratio of the two audio
signals is determined by a comparison of their signal to noise ratios, the “blending” action occurs regardless of how
strong (or weak) the incoming RF signals are. This is the distinct advantage of this receiver design over any other
type of diversity system available.
AUDIO LEVEL This control knob adjusts the audio level of the XLR output on the rear panel.
OPTI-BLEND
OFF
ON
AUDIO LEVEL
POWER
A B
–20
0dB CODE
LECTROSONICS
MODULATION
GRN RED
GRN
RED
YEL
RATIO
DIVERSITY
DIGITAL
CODE
GRN
REAR PANEL CONTROLS AND FUNCTIONS
ANTENNA INPUTS These inputs connect to any 50 ohm antenna with a BNC type connector.
12 VDC IN This input connects to the supplied CH-12 AC adapter for powering the receiver from a 110/120V AC
source. The receiver may also be powered from external 12 volt DC sources using the correct plug (Switchcraft S-
760 power plug). The center pin is positive. (+).
AUDIO OUT This XLR type connector supplies a balanced, low impedance output at microphone level. The audio
signal is present on pins 2 and 3, while pin 1 is ground. The output level of this jack is controlled by the AUDIO
LEVEL control on the front panel of the receiver. Pin 2 is “hot” in terms of polarity.
ANT B ANT A
AUDIO OUT
12V DC IN
1
2
3
Rio Rancho, NM – USA
3
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