Lectrosonics R1a, Инструкция по эксплуатации и руководство по устранению неисправностей

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5
IFB Receiver
Rio Rancho, NM – USA
HEADPHONE JACK (fig. 1 & fig. 2)
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.
Strain relief to avoid accidental disconnection can be provided with
the included small hook and loop strip. Attach the adhesive strip
side to the side of the receiver with the opening end of the strip up
- place the cord in the strip and secure.
MONO PLUG/STEREO PLUG USAGE
A Mono plug or a Stereo plug can be used with the IFBR1a
headphone jack directly. When a Mono plug is inserted, a special
circuit senses the “ ring ” to “ sleeve ” short and automatically
switches off the ring to prevent excess battery drain. To reset,
switch power OFF then back ON.
AUDIO LEVEL
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. High impedance
phones (600 to 2000) Ohms will have an inherently
lower power level due to their high impedance and
likewise low impedance phones may be extremely
loud. CAUTION! Always set the Audio Level knob to
minimum (counter-clockwise) when plugging phones
into the jack, then adjust the knob for a comfortable
audio level.
FREQUENCY ADJUST (fig.3)
These two rotary switches adjust the center frequency of the carrier. The 1.6M is a coarse adjustment and the 100K is
the fine adjustment. Each transmitter is factory aligned at the center of its operating range. The default position of the
frequency select switches is in the center of the transmitter ’ s range. The receiver and transmitter switches must be
set to the same number/letter combination for proper operation.
To gain access to these switches, slide the access door sideways with a fingernail.
Figure 4 - R1a Block Diagram
FREQUENCY
1.6MHz 100kHz
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
BLK 20 (BK)
512.0 - 537.5
0 1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Figure 3 - Frequency Adjustment
Memory
Controller
Control
Panel
LED
Compandor
Audio
Filter
Audio Out
IF Amp/FM
Detector
5V
Regulator
9V
Battery
On/Off
Amp Mixer
100n
100n
2p
Disc
RSSI
RF
Filter
RF
Amplifier
Frequency Synthesizer
PB Switch
Pwr On/Off,
Audio Level.
Control
Knob
Pilot
Tone
Detector
Pilot
Tone
Mute
Cord
(Ant.)
Earphone
2.5vdc
2.5vdc
MAX
LEVEL
MONO PLUG (Open)
STEREO PLUG (Closed)
S
T
R
Figure 2 - Headphone cord strain relief