Before lining up the optical links, you have to take care that the input signals do not exceed the maximum levels (see Specifications on last page of this document)!
Start with 0dB gain settings on LFRX and LFTX card. In this configuration you should have approx. +2..-2dB gain over the whole optical link. Due to variance of laser- and receive-diodes you might have some gain-spreading between different links. Depending on configuration of your sat-nms LFTXRX frame you might have additionally more attenuation:
| option | option name | additional attenuation |
|---|---|---|
| 1:1 redundant switch | LFSW | 3dB each frame |
| 50/75Ohm converter | LFCH...MNC75 | 0.7dB each frame |
| 1:4 splitter | LFRXv4 | 12.5dB |
| dual coupler | LFC10TX or LFC10RX | 1.5dB |
When connecting an occasional use antenna, point your dish to the satellite with the highest total power. This is to ensure not to generate a maximum level fault during normal operation.
Now increase the gain setting of the LFTX transmitter card as long as a max. level fault is displayed. Now decrease gain setting 2..3dB.
After that, adjust the gain setting in the LFRX receiver card to adapt the signal strength to your receiver equipment. For sure you have to watch out not to exceed the alarm level. If a RF max. level is displayed on the LFRX card, decrease gain setting until alarm disappears.