One aspect that you need to consider is:

• The output of the RF modulator for the I standard requires a spacing between the video - audio carriers of 6 MHz, instead of the 5.5 MHz of PAL B/G.
• Therefore an additional modification in the hardware for PAL I is necessary:
  • There are three components between pins 17 & 18 of the IC TDA5666-5:
    • C26,
    • R10
    • l1 variable coil.
  • There is a 100k resistence at pin 16 followed by a "T" that consists of two resistors:
    • R201
    • R202. (table)
    • l3 has to be adjusted to obtain the 6 MHz spacing between the video and audio.

    

• This can be carried out by using the field strength meter to measure the 6 MHz video & audio carrier frequency spacing .
  • Never use the spectrum analyzer for this.
  • The frequency accuracy of the FSM is much better.
  • For SAT100 receivers, the video/audio ratio is fixed.