Lectrosonics R1 User Manual download pdf (Page 5)

IFB Receiver

HEADPHONE JACK (fig. 1)

On the front panel is a 3.5mm mini phone jack to accommodate a standard mono or stereo type 3.5 mm plug. The unit

will drive low or high impedance earphones. The jack is also the receiver antenna input with the earphone cord acting

as the antenna. The cord length is not critical but must be at least 6 inches minimum.

OUTPUT DRIVE LEVEL ADJUST (fig. 2)

On one side of the receiver unit is a sliding door covering an Output Max Level screwdriver adjust potentiometer. The

potentiometer can be adjusted to match high or low impedance earphones to prevent blasting.

MONO PLUG/STEREO PLUG SWITCH (fig. 2)

Also behind the sliding door is a Mono/Binaural switch. When

using a single earphone with a mini phone plug (tip & shield), set

the switch to MONO PLUG. To provide Monaural output to both

MAX LEVEL

MONO PLUG

STEREO PLUG

Figure. 2 - Max Level and

earphones of a dual headset with a stereo mini plug (tip, ring &

Mono Plug/Stereo Plug Switch

shield), set the switch to STEREO PLUG.

Warning! Do not insert a mono plug with the switch in the STEREO PLUG position. This

will short the jack ring to the sleeve and cause high distortion and short battery life.

MAX LEVEL (fig. 2)

Headphones and ear pieces vary widely in their sensitivity and their impedance making it impossible to design a

receiver with a fixed output power level that is correct for all situations. The MAX LEVEL control on the side of the

receiver is used to adjust the maximum power that can be delivered to the user selected headphones. Low impedance

phones (16 to 50 Ohms) will have the MAX LEVEL control set in a counter-clockwise direction to limit the maximum

output power to a reasonable level. High impedance phones (600 to 2000) Ohms) will have an inherently lower power

level due to their high impedance.

ADJUSTING THE MAX LEVEL CONTROL

Set the control fully counter-clockwise (minimum power level) then adjust the front panel volume control for the desired

gain. If there is excessive distortion on loud sounds adjust the MAX LEVEL clockwise thereby increasing the power

level. Use only the power level necessary for safe hearing levels.

Memory

Controller

Control

Panel LED

Compandor

Audio

Filter

Audio Out

IF Amp/FM

Detector

Regulator

Battery

On/Off

Amp

Mixer

100n

Disc

RSSI

Filter

Amplifier

Frequency Synthesizer

PB Switch

Pwr On/Off,

Audio Level.

Control

Knob

Pilot

Tone

Detector

Pilot

Tone

Mute

Cord

(Ant.)

Earphone

2.5vdc

MAX

LEVEL

MONO (Open)

BINAURAL (Closed)

Figure 3 - R1 Block Diagram

Rio Rancho, NM – USA

1 2 3 4 5 6 7 8 9 10 11 12

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Lectrosonics R1 User Manual Page 5

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