User's Manual

Model 1150A DVOR
2-62 Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
System AC voltage and current as well as obstruction light (oblite) AC voltage and current are sensed and scaled on
the AC Monitor CCA before arriving at the BCPS CCA. Op-amps U10A and U10D, with potentiometers R29 and
R30, calibrate the system and oblite VAC signals. Op-amp U14, with potentiometers R44 and R56, calibrate the
system and oblite IAC signals. The calibrated signals pass to analog multiplexer U11 before analog-to-digital
conversion by microcontroller U8.
Status of the BCPS is displayed on LEDs CR7 and CR48 through CR54, all of which can be lighted by pressing
lamp test on the LCU CCA. The microcontroller U8 reports status digitally to the RMS CCA via RS2332 signals
through the TTL-RS232 converter U9. The microcontroller U8 may be reset at any time by pressing Reset on the
LCU CCA.
After reset, microcontroller U8 uses the BCPS strapping of connector P1-31 (grounded or open on the corresponding
Carrier Backplane position) in conjunction with the Synch In and Synch Out signals (P1-29 and P1-30) to determine
whether it is BCPS1 or BCPS2 and if another BCPS is active in the cabinet. Microcontroller U8 also reads revision
strap inputs U8-9, U8-23, and U8-33 after reset to determine hardware configuration.
Front panel circuit breaker CB1 may be used to disconnect +48 BUSS power from the Carrier Backplane so that
other modules in the cabinet on the same transmitter side may be serviced.
Figure 2-24 Fanless BCPS CCA Block Diagram