This is a user manual for IRAM Plateau de Bure Observatory FIBER OPTIC TRANSMITTER
The IRAM FO_TX fiber optic transmitter is a rack unit that converts electrical receiver signals into optical signals and monitors the ageing of two laser diodes. The manual describes the 19-inch rack, its motherboard, two laser diode devices with Peltier coolers, CAN and RS232 interfaces, front-panel indicators, and optical outputs.
The document covers general specifications, device connections and pin-outs, instrument and local interfaces, implementation details, built-in firmware, CAN software functions, troubleshooting, and LabVIEW test software.
| +15VDC power requirement | +15VDC/500mA |
|---|---|
| -15VDC power requirement | -15VDC/300mA |
| +5VDC power requirement | +5VDC/2.5A |
| Operating temperature range | 0 – 70°C |
| Rack dimensions | 440 mm x 310 mm, height 130 mm |
| Motherboard PCB dimensions | 180 mm x 100 mm |
| Front IF input level | -25 dBm, AC coupled |
| Optical output level | around -10 dBm |
The module requires +15VDC/500mA, -15VDC/300mA and +5VDC/2.5A.
The front IF input is AC coupled with a level of -25 dBm.
L1 red flashes to indicate a fan failure.
Daily laser data is recorded and stored in an EEPROM controlled through the SPI interface.