Gai-tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telep Instrukcja Użytkownika Pobierz pdf (Strona 12)

Foreword PL1877A Microprocessor Radio Telephone Interconnect

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Specifications

General

Input voltage ......................................................................................................................... +10.5–16 V dc,

or optional 115 V ac, 60 Hz; 220 V ac 50/60 Hz;

Input current...................................................................................................................... Less than 750 mA

RFI protection.................................................................................................................................... Built-in

Hum and noise ........................................................................................... −45 dB from 1,000 Hz reference

Audio Distortion ............................................................... 1% maximum with reference to a 1,000 Hz tone

(−10 dBm input, phone to transmitter path)

(0.45 V ac input, low level receiver speaker input to phone path)

Circuit loading to TX audio...................................................................... Bridging impedance (ac-coupled)

Output level to radio transmitter......................................................... 15 mV

RMS

to 0.5 V

RMS

into 600 ohms

Output level to phone line............................................. −9 dBm maximum (time averaged over 3 seconds)

Input level from phone line.............................................................................................. +5 dBm maximum

autolevel threshold: −35 dBm, +3 dB

Phone line busy detect threshold ................................................................................................−20 V, +

2 V

(or 10 V, +

2 V with 24 V threshold user selectable)

Phone line ring detect ......................................................................... Adjustable from 20 V

RMS

to 50 V

RMS

Ringer equivalence ............................................................................................................ 0.0B (ac)/4.9 (dc)

Input Audio Level from Receiver

High level discriminator/detector .................................................................................... 0.45 V

RMS

+8 dBm

Low level discriminator/detector........................................................................................ 80 mV

RMS

+8 dB

High level flat audio .................................................................................................. 2.5 V

RMS

+6 to -8 dBm

Low level flat audio............................................................................................................ 0.45 V

RMS

+8 dB

Impedance.............................................................. 600 ohms or high impedance bridging (user selectable)

Audio Frequency Response

RX to land-line.......................................................................................................... 360 to 3,000 Hz, +3 dB

Land-line to transmitter ............................................................................................ 300 to 3,000 Hz, +

3 dB

(−45 dBm input, phone-to-transmitter path 45 mV ac input,

low level flat input to phone line path, auto-level disabled)

Logic Level Inputs

Input impedance.............................................................................................................................. 90k ohms

(inputs pulled up through 100K ohms to power input voltage)

Maximum low level input..................................................................................................................... 1.5 V

Maximum high level input.................................................................................................................... 3.5 V

Maximum high level............................................................................................................................ 100 V

Physical

Temperature range.................................................................................................................. 0º C to +60º C

Humidity.............................................................................................. <95% at relative humidity at +50º C

Dimensions ..................................................................................................... 7.0 W × 8.3 D × 1.5 H inches

Weight......................................................................................................................................... 26.9 ounces

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