[ARC5] Dynamotor Capacitor

[Mike Feher]

Agreeing with John does not make it right, unless you also need your ego
stroked daily. Sparks do create radiated emissions, and grounding the
dynamotor case does indeed minimize the amount radiated. The capacitor
minimizes the amount conducted. When the brushes break L*(dI/dT) is
tremendous. 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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