UHP SCPC MODEM
USER MANUAL, v3.2
© ROMANTIS 2015
32
www.uhp.net
5.3
Transmitter 1dB Compression Point Setting
This procedure is used to determine the Station transmission power level where the BUC enters compression
mode and to determine the power margin calculated according to the measurements.
Like in the previous section the measurements are performed using unmodulated (CW) carrier. It is necessary to
increase the transmission power by changing TX Level setting by 1dB (Up/Down buttons of modulator control can
be used). This procedure should be performed under supervision of the satellite operator. The 1dB compression
point (P1dB) indicates the power level that causes the gain to drop by 1 dB from its small signal value.
Save the power value at which the BUC approaches P1dB point. This value will be used in setting up an automatic
adjustment of TLC transmission power when selecting ACM settings as well as when calculating other network
settings.
