GROUP DELAY PRE-
CORRECTION
The specifications for a number of television systems state that the transmitted signal must be pre-
corrected in terms of group delay to allow for the distortion produced by the IF filters in television
receivers.
CCIR Rep.624 recommends three curves which apply variously to the following systems: B/PAL,
G/PAL, M/PAL and M/NTSC.
The response of the three networks offered correspond to the three recommended curves in terms of
group delay and are equalised to have an amplitude ripple of less than 0.2 dB over the video band.
They are supplied in 40 pin encapsulated modules which occupy a board area of less than 11 sq. cm.
FP443A
Group Delay Pre-correction
Curve
Insertion Loss at 100 kHz
End Of Passband
Passband Amplitude Ripple
Impedance
Temperature Range
Aqueous Washable
Package
B/PAL
G/PAL-A
< 1.5 dB
5.5 MHz
< 0.2 dB
75 ohms
0°C to 70°C
No
DR00020B
FP443B
B/PAL
G/PAL-B
< 1.5 dB
5.5 MHz
< 0.2 dB
75 ohms
0°C to 70°C
No
DR00020B
FP358C
M/PAL
M/NTSC
< 1.5 dB
5.5 MHz
< 0.2 dB
75 ohms
0°C to 70°C
No
DR00020B
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
FARA161d
Page 1 of 2
Dec-99(A)
FARADAY [ FARADAY TECHNOLOGY ]
