86 iDirect Satellite Router Installation and Commissioning Guide
iDX Release 3.3
Preparation
today’s BUCs are able to maintain acceptable Adjacent Channel Power Ratios (ACPR) while
operating within a dB or less of maximum rated power.
Network designers consult manufacturer data sheets to
determine the operating point and
headroom requirements of individual amplifiers. The considerations are incorporated into the
link budget and site provisioning calculations. The purpose of P1dB determination in the
iDirect system is to set a maximum IF transmit power limit for each site.
Figure 49. Sample Transfer Characteristic
Sample
Amplifier
Transfer
Characteristic
P
OUT
dBm
P
IN
dBm
P1dB
Point
Linear
Region
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