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RTU-292 Operations Manual
Table 1-3 RTU-292 SPECIFICATIONS
TELEPHONE LINE INTERFACE (J2, Male DB-9 Connector)
Output & Input Levels to Phone Line Nominally -12 dBm. (Adjustable -21 to 0 dBm in 3 dB steps).
Frequency Response +2 dB, 300 to 3200 Hz.
Output Impedance to Phone Line 600 Ohm .
VOX Sensitivity 16 +2 dB Below Phone Line Input Level Setting.
(-25 dBm @ -9 dBm Level Setting, for example)
VOX Hang Time 0.6 Second or 2.0 Seconds, (Internally Settable).
Hybrid Balance/Adaptation Speed
(into 600 Ohm)
-30 dB over 300 to 3200 Hz BW within 1.25 Sec.; measured with
white noise source.
Ultimate Hybrid Balance (into 600 Ohm) -50 dB typical over 300 to 3200 Hz BW; measured with a single
tone.
Hybrid Impedance Matching Capability 0 to 10k Ohm Complex Impedance.
Phone Line Connections RJ11C Connector (J1) and screw terminals on rear panel term
block.
RADIO INTERFACE (J1, Male DB-9 Connector)
Input Impedance Balanced or Unbalanced 600 Ohm or Unbalanced 47K Ohm.
Input Level -40 to +10 dBm, Internally Adjustable.
Output Impedance 600 Ohm balanced.
Output Level -40 to +10 dBm, Internally Adjustable
Frequency Response 300 to 3200 Hz + 2 dB.
Key Relay Output Low Level Relay Contacts, 60VA max., Switching Speed: 5 msec.
TELEPHONE
Handset (RJ12C Jack) Electret microphone, dynamic receiver.
Dialing Modes DTMF, Pulse at 10 pps
Pulse Dial Make/Break Ratio 40/60.
Dialing Keypad 3x4, Standard Telephone Layout.
GENERAL
Microphone Interface ALC (Automatic Level Control) with 30 dB dynamic range.
Headphone Interface Drives high, medium, or low impedance headphones.
Phones Jack (monaural) Delivers NLT 10mW into 600-Ohm headphones.
Speaker Driver Power 4W min @ 10% Distortion.
Internal Speaker 3 inch square, 3.2 Ohms.
Indicators Peak Level, Keyed, and Indicator for each pushbutton.
Front Panel Controls Power Switch, Dialing Keypad, Speaker and Handset Volume
Controls, Pushbuttons: Tel Line/Phone, Tel Line/Radio, Off,
Handset/Phone, Handset/Radio, Speaker/Phone, Speaker/Radio,
Tel VOX, Manual Key, Auto Answer, Audible Ring.
AC Input Power 115 or 230 VAC +/- 15%, 47-63 Hz, 20 VA typical, 50 VA max.
DC Input Power +11 to +15VDC or +22 to +30VDC, 1 A Maximum.
Size 3.5"H x 19"W x 10"D (8.9 x 48.3 x 25.4 cm)
Weight 12 lbs. (5.5 kg).
ENVIRONMENTAL
Operating Temperature -20
0
C to +55
0
C.
Storage Temperature -40
0
C to +85
0
C.
Humidity Up to 95% @ 55
0
C.
Shock MIL-STD-810D, method 516.3 procedure VI.
Vibration MIL STD 810D, method 514.3 Category I.
JPS Communications, Inc.
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