Service manual

V. RN-120A
SPECIFICATIONS
AMPLIFIER
DESIGN
Solid-state,
integrated
circuit
amplifiers
which
include
a mic
pre-amp
with
limiter,
headset
power
amp,
speaker
power
amp,
and signalling
circuitry.
Current-limited
with
short-circuit
and reverse
polarity
protection.
MIC PRE-AMPLIFIER
GENERAL
SPECS
Freq.
Response:
250-12k
Hz,
with
Line
Level:
OdBv
max,
-18dBv
nom.
mic
limiter;
contoured
Sidetone
Adj:
35 dB
null
to
full
on
to
enhance
intelligibility
Signal
Voltage:
l1VDC
on
audio
line
Mic
Input
Impedance:
lk ohms
Call
Light
Sensitivity:
4 volts
Mic Preamp
Gain:
+37
dB
Signal-to-Noise:
68 dB
Max
Input
Before
Clipping:
-10
dBv*
Equivalent
Input
Noise:
-118 dB
Mic
Limiter
Range:
25 dB
Station
Bridging
Impedance:
>12k
ohm (200-10k
Hz)
Power Requirements:
25 mA quiescent
HEADSET/SPEAKER
AMPLIFIER
100
mA signal,
100 mA
avg. talk
Freq.
Response:
100-18k
Hz,
12 dB
200
mA short-circuit
Load Impedance
Range:
300-2000
ohms
Voltage
Range:
12-32V,
28V
nominal
(dynamic
headset)
Dimensions:
1.75"
x 19"
x 6.5"
deep
Output
Level:
+18
dBm, 26v
p-p
44 mm
x 483
mm x 165
mm
@ 200
ohms
CONNECTORS
Headset
Level:
+110
dB SPL
Dynamic
Headset:
4-pin
XLR,
male
(with
standard
Clear-Com
headset)
Carbon
Headset:
1/4"
phone
jack
Headset
Distortion:
0.2%
THD
@ lkHz
Line:
(4) 3-pin
XLR
Headphone
Amp
Gain:
+37
dB
Channel
A--i male,
1
female
Speaker-Type:
16 ohm,
3"x
1.5"
oval
Channel
B--i
male,
1 female
Spkr.
Amp
Output:
2.5w
into
16
ohms
Program
Input:
3-pin
XLR,
female
Speaker
Level:
+98 dB
SPL @
3 feet
Ext. Speaker:
1/4"
phone
jack
(disconnects
internal speaker)
* 0
dBv is referenced
to 0.775
volts
EMS
7