[R-390] mech. filters

[Mark Huss]

 From your description, it sounds like the thing may be shorting to the 
case. This is NOT supposed to happen.

n4buq at knology.net wrote:
>> Barry,
>> I see you  have a noisy ant trimmer.  You may get lucky and possibly save 
>> yourself  from pulling the rf deck.  The ant trimmer shaft is insulated 
>>     
> from 
>   
>> chassis  by a fiber washer under the nut securing it to the bracket.  The 
>>     
> nut is  
>   
>> directly below the ant gear that turns the ant trim shaft.  By loosening  
>>     
> the 
>   
>> nut and lifting the trimmer upwards you can get in there with a small 
>>     
> brush  
>   
>> and clean crud from the washer.  Also tuner cleaner may help dislodge 
>>     
> and  dirt 
>   
>> that may be there.  It's worked for me on at least one  occasion.
>>
>> Regards,
>> Rich WD2Q
>>     
>
> Rich,
>
> I'll have to try that.  I didn't know that was possible.  It sure would 
> save me a lot of work.
>
> I removed the cross-drive shaft (the one that goes to the front panel) and 
> turned the trimmer by hand and I didn't notice as much noise.  I figure 
> some of the problem may be in the insulating sleeves and washers for that 
> assembly.
>
> I do notice that when I turn the trimmer CW, the noise is much less than 
> when turning it CCW.  A CW rotation forces the shaft against the fiber 
> washer whereas a CCW rotation forces the shaft against the metal washer on 
> the outside of the assembly (where the E-ring fits into the groove on the 
> shaft).  This seems to indicate there is some conductivity from the gear 
> through the shaft but I have all the pieces in place so not sure why that 
> would be.
>
> I wonder if I need a fiber washer between the E-ring and the frame?  I 
> don't recall seeing one there but maybe I'm missing something?
>
> Barry - N4BUQ
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>   


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