Satellite Communications-IRIG-B Signal Decoder

Satellite Communications

 

A line of advanced technology products developed by Ro.Ma. enginery  to broaden the range of the Company’s offers and expand the activities in a growing sector of the world market.

 

IRIG-B decoder

Provides readout and integrity checks on the time code transmitted by the satellite.

The IRIG-B decoder is an advanced-technology product developed by Ro.Ma. enginery  to broaden the range of the Company’s offers and expand the activities in a growing sector of the world market.

 

The IRIG-B decoder’s functions are  to read and check for integrity  the time code in the IRIG-B format transmitted by the satellite, and to decode and display the BCD information contained in it.

The IRIG-B decoder verifies the validity of the input signal and, if the result  is positive, it derives from the IRIG-B code a pulse per second synchronized with the marker of the code. Furthermore, the unmodulated input IRIG-B code is replicated at the output.

The time information is also made available to the users over a serial digital interface. These signals allow synchronization with the time signal generated onboard the satellite.

 

Front panel controls:

  • Ordinary year/leap year selector

  • TTL/RS-422 input selector

  • Local/Remote key-operated selector to enable local control; on normal operation the control is remote

 

 Signal inputs:

  • Input for external 10MHz reference signals 50 Ohm nominal input impedance, +10dBm ±2dB level, BNC connector, isolation transformer at the input

  • Opto-isolated input of the unmodulated IRIG-B digital signal. The electrical interface is implemented in accordance with the RS-422 A standard, 9-pin male connector.

  • TTL-compatible input of the IRIG-B unmodulated digital signal, BNC-type connector

  • Remote selection input, 15-pin female connector.

 

 Signal outputs:

  • 4 signal level outputs, TTL-compatible, non-isolated, available at BNC connectors, 50Ohm impedance; the output signal replicates the unmodulated IRIG-B input signal.

  • 4 signal level outputs, TTL-compatible, non-isolated, available at BNC connectors, 50Ohm impedance; the output signals provide, in the format of a pulse per second, the time reference of the start of the second. The duration of the pulse can be set with internal jumpers to any of the following nominal values: 0.01, 0.1, 10 e 100 ms. with an accuracy of ±200ns.

  • 1 output as per EIA RS-485 interface standard; the message contains the time information encoded in ASCII characters, consisting of day of the year, hours, minutes and seconds. The message is transmitted at 10sec intervals at the start of second 0, 10, 20, 30, 40, 50 of every minute. The connector is 9-pin, female.

 

 
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