Date   : Sun, 13 Nov 2005 15:42:36 -0000
From   : "David Hunt" <dm.hunt@...>
Subject: Re: RF Modulator Interference

> Does anyone have any ideas what is causing the interference, seem to be
> power related. The machine does have a solidisk sideways ram board that
> sits beside the modultator. 

Which revision of the motherboard do you have?

There were problems in earlier revisions of the board, e.g. I have an issue
3 board and it has been extensively modified by Acorn. The BBC Micro Service
Manual has a comment on your problem;

"Certain other faults on the VDU display associated with the UHF output can
be cured by adding extra decoupling to the supply to the modulator to
improve its stability. A 10 ohm series resistor with a 4.7 uF capacitor to
earth is usually sufficient."

A reasonably easy soldering job, might solve your friends problem.

Dave ;)