Date   : Mon, 14 Nov 2005 14:25:53 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: RF Modulator Interference

Greg Cook wrote:
> On Sun, 13 Nov 2005 22:39:26 +0000, Jules Richardson
> <julesrichardsonuk@...> wrote:
> 
> 
>>Did anyone fiddle with the adjustment cores for coils in the
>>modulator? 
>>(I think one's accessible through the shielding, the others need the
>>lid 
>>popping). Just wondered if someone tried that to see if it would cure
>>
>>the fault and then adjusted things to far and broke the core.
> 
> 
> Seconded.  Don't force the ferrite slug, it won't give much resistance
> before it cracks.  Be sure to use a plastic screwdriver.
> 
> If that's happened with yours then the tuning will wander as the
> ferrite pieces shift around.  They'll also shake with vibrations from
> the speaker or a disc drive on the same desk. 

Good point - I hadn't thought that a broken core could also be the root 
cause of the problem, but I suppose you're right. So swapping the 
modulator out could well be a complete fix....

I think I might have a spare one on a parts machine if needed - just not 
sure if I still have the parts machine itself as I recall using most of 
the bits from it :)

cheers

Jules