[ARC5] nasty hum - more

[Mike Hanz]

What's the frequency of the hum on the scope?  It makes a difference in 
tracking down the problem.

On 5/25/2015 6:57 PM, J Mcvey via ARC5 wrote:
> I tried a clip lead from the dyno to the case and also to my earth ground system, but no change.
> I'll pull the dyno apart later and recap that too.
> I'.m running this BC453 on my shack 160M dipole, with shield to ground using an open lug to slide behind a conveniently located screw near the antenna terminal and center conductor to the post, of coarse...The antenna adjust appears to find a sweet spot even though the  antenna is not to ARC spec.
> I'm finding lots of beacons, especially from Canada for some reason. I am curious about 600M propagation. There was only one experimental on last night. I believe it was WD2XSH/30 or 31 as the QSB was pretty bad.The local SW beacon, about 8 miles away, overloads the BC453 easily and I think beacons are only 25 watts!
>   
>
>
>       On Monday, May 25, 2015 5:20 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>     
>
>   On 25 May 2015 at 20:54, J Mcvey via ARC5 wrote:
>
>> Is it the dynamotor or are my NOS caps not so NOS?
> Also, there are at least three capacitors inside the end-bells of the
> dynamotor. As I remember it, there are two on one end connected from each
> brush to "ground" and one across the other end.
>
> If any of those are leaky, hum will be stronger.
>
> Ken W7EKB
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