Description And Specifications; Features; Connections & Controls; Specifications - RTS BP-319 User Manual

BP-319 / BP-351 User Station
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BP-319 / BP-351 User Station

1 Description and Specifications

DESCRIPTION
General
The BP-319/351 is a portable user station for
use with RTS 2-wire intercom systems. The
BP-319 is a microprocessor controlled one-
channel intercom, where the BP-351 is a
microprocessor controlled two-channel select
intercom belt pack. Both have connections
for headset/earset microphones (Dynamic or
Electret). The factory setting is for Dynamic.

FEATURES

Features of the BP-319/351 include:
1) Call function that allows the user
to send or receive call signals to
other devices on the intercom
channel, including Audible Call
Alert on the listen side.
2) Microprocessor controlled
Microphone Kill Detect.
3) Powered externally, via the
intercom system power supply on
channel one.
4) Headset/earset 4 or 5-pin XLR
connection set for intercom
operation.
CONNECTIONS & CONTROLS
The BP-319/351 has the following connec-
tions and controls:
Intercom volume control.
Headset connectors that accept an XLR type
4 or 5-pin male connector.
Line connector that accepts and XLR type 3-
pin male connector for the intercom line and
power input.
A loop through connection connects several
belt packs in a chain. Since this is often the
preferred method of connecton, a line loop
connector has been added to new units (see
figure Figure 1).

SPECIFICATIONS

General
Channel Supplied Power Requirements
30 VDC nominal (standard RTS line), 45
to 70 mA.
Environmental Requirements
Storage: -20°C to 80°C; to
95% humidity, non-
condensing
Operating: 0°C to 50°C; 0% -
95% humidity, non-
condensing.
Dimensions: 4.75" (120.7 mm) H x
3.5" (95.3 mm) W x
1.6" (40.6 mm) D
Weight: Approximately 13 oz.
(364 g).
INTERFACE REQUIREMENTS
Headset/Earset:
50 to 200 Ω dynamic micro
phone
50 to 600 Ω headphones
RTS Intercom Channel:
Output Level: 0.775 Vrms (0dBu)
nominal
200 Ω ±5%
Input Level:
Bridging
greater than 10,000 Ω.
Impedence:
Call Signaling:
Send 20kHz ±100Hz, 240 Vrms
±10%
Receive 20kHz ±800 Hz, 100
mVrms ±10%
Mic-Off Frequency Detect:
24kHz ±800Hz, 100 mVrms
Noise Contribution
less than -60 dB on the line.
Headphone Amplifier
Voltage Gain:
18 ±3dB from the line
Maximum Output:
60 mW into 150Ω
Frequency Response:
200Hz to 8kHz+1 / -4dB
nominal
Audible Alert:
1kHz, at the headset/earset
Total Harmonic Distortion
Less than 0.2% nominal at
50mW from the line
Dynamic Microphone Amplifier
Voltage Gain:
Mic to Channel; 45±3dB,
before limiting.
Mic to Headphone; adjustable,
65dB±10% range into 150Ω
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