Comtech EF Data EQ90 Series - Manual (Page 37)

EQ90 Amplitude Equalizer Operation
Rev. 2 3-13
A single group delay equalizer exhibiting the same peak-to-peak delay, as the filter may
appear as shown in Figure Chapter 3-10. Combining the filter and equalizer response will
produce a delay response as shown in Figure Chapter 3-11. A substantial delay ripple
may be the result (which is not desirable in most cases). This ripple response occurs
because the equalizer delay response is not parabolic in shape. The equalizer response is
actually parabolic only over a narrow frequency range near its delay peak.
IF FREQUENCY (MHz)
DE
LA
Y
(N
S
)
Figure Chapter 3-10. Single-Section Equalizer Delay Response
IF FREQUENCY (MHz)
DEL
A
Y
(SN)
Figure Chapter 3-11. Composite Delay Response