[ARC5] Dynamotor Capacitor

[J. Forster]

> Agreeing with John does not make it right, unless you also need your ego
> stroked daily.

I don't need egoboos. And, I an PROVE what I said, using standard EE.

> Sparks do create radiated emissions,

I NEVER said otherwise.

> and grounding the dynamotor case does indeed minimize the amount
> radiated.

Again, I never said otherwise.

> The capacitor minimizes the amount conducted.

Yes and no. No, if the soure is low impedance, as I said.

> When the brushes break L*(dI/dT) is tremendous.

Yes and no. Yes, there is a voltage spike. No in that the voltage spike is
NOT across the power line, it's across the just-opened armature winding.

-John

===============

73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of Kenneth G. Gordon
> Sent: Tuesday, March 25, 2014 11:18 AM
> To: J. Forster; 'ARC5'
> Subject: Re: [ARC5] Dynamotor Capacitor
>
> On 25 Mar 2014 at 6:51, J. Forster wrote:
>
>> Doesn't matter. If the Source is stiff (low impedance) there won't be
>> voltage spikes.
>>
>> The caps are in case the source is NOT stiff, as I said.
>>
>> -John
>
> A case in point: ARC found that the most effective way to reduce or
> eliminate hash from the dynamotor into the receiver was to, simply,
> thoroughly "ground" the dynamotor frame to the receiver chassis.
>
> I would think that if the hash was caused by several hundred volts of
> back-EMF hash, this would have had minimal impact.
>
> I agree with John.
>
> Ken W7EKB
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