 circuit length If the 3rd harmonic is outside the frequency band of interest then the 2A-B intermodulation product may be used instead of the 3rd harmonic by the definition: Equipment Number of Total noise equipments allocation 'The overload point or overload level of an amplifier is 6dB higher Channel translation than the absolute power level in dBm, at the output of the amplifier, 200pWOp of each of two sinusoid signals of equal amplitude and of frequency 200p WOp A and B respectively, when these absolute power levels are so Group translation 240pWOp adjusted that an increase in 1dB of both of their separate levels at 80pWOp the input of the amplifier cause an increase, at the output of the Supergroup translation 360pWOp amplifier, of 20dB in the intermodulation product of 2A-B. 60pWOp Higher order translations 1440pWOp 20.9.1.2 Gain change 120pWOp Through connections etc. 260pWOp From Equation 20.13 it can be seen the gain to the fundamental signal decreases by a factor given by expression 20.35 due to the Line equipment noise 7500pWOp non-linear characteristic. (20.35) 20 log Recommended design targets are included in Tables 20.9 and 20.10. The line equipment noise figure in Table 20.10 corresponds to 3pWOp per km. For wideband services, such as TV transmission, This effect can be used to give a definition of overload such that: the equivalent requirement is more onerous at 1.5pWOp mean noise contribution per km. 'The overload is the output power in dBm of a signal such that a further increase in 1dB of a fundamental sinusoid signal power at 20.10.2 Line sections the input of the amplifier will give an increase in power at the output of the amplifier of the fundamental signal of 0.9dB.' The following applies: The advantage of this last method is that it is easy to perform and 1. The coaxial cable hypothetical systems are constructed from can be measured at any frequency in the band of interest. homogeneous line sections of 280km. 2. The change of gain of a regulated 280km homogeneous line section due to seas