The abbreviation for
IF
The abbreviation for intermediate frequency. An IF frequency is a frequency to which a signal wave is shifted locally as an intermediate step in transmission or reception. On analyzers, this is the frequency resulting from conversion before demodulation.
IF gain/IF attenuation
A control that adjusts the vertical position of displayed signals without affecting the signal level at the input mixer. When changed, the value of the reference level is changed accordingly.
IF feedthrough
A condition that results in a rise in amplitude of the baseline trace. This occurs as a result of an input signal at the intermediate frequency (IF) passing through the input mixer. This a usually only a potential problem on nonpreselected analyzers. The entire baseline trace rises because the signal is always at the IF. (Mixing with the local oscillator is not required.)
image response
A displayed signal that is actually twice the intermediate frequency (IF) away from the frequency indicated by the analyzer. For each harmonic of the local oscillator there is an image pair. One is below the local oscillator frequency by the IF and the other is above. Images usually only appear on nonpreselected analyzers.
impedance
The apparent opposition in an electrical path to the flow of current. The specified nominal input impedance of an analyzer is stated for the input connector. The most common impedance for RF and microwave analyzers is 500. However, 7562 is typically used for cable television (CATV) work.
impulse bandwidth
The width of a rectangular filter that has the same peak voltage output as the actual analyzer filter. The impulse bandwidth of the