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Default Modulator PAL B/G 6.5 MHZ sound spacing to B/G 5.5 or 6 Mhz s. spacing

I have a small broadcast CABLE tv system. Using 12 Modulators
which accept 12 Audio /Video signals and output composite RF signal.
Each RF output of each Modulator will then feed a signal mixer. So
there are 12 channels. The system is PAL B/G with 6.5 sound spacing.
The problem is that most of the users have only PAL B/G 6 mhz
Televisions. So the users can get the video picture but no sound OR
SOUND WITH TERRIBLE HUMMING
Question is how I can tune the modulator with 6.5 mhz of sound spacing
TO SOUND SPACING 5.5 OR 6 MHZ.

PETER

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