[ARC5] Dynamotor noise in SCR-274 receivers

[robert meadows]

 Take the end covers off, run the noisy little beast and watch the sparks on the commutators.  Bet there are many with the noisy units.RobertW4RRD
    On Monday, August 25, 2025 at 04:50:07 PM EDT, hwhall--- via ARC5 <arc5 at mailman.qth.net> wrote:  
 
 Some of the Command Set receivers I've encountered had grounding straps from the dyno base plate to the receiver chassis, not just relying on the connector pins for grounding. Maybe it was a feature of the lower freq navigation sets? I should've paid more attention to when/where I saw them.

Wayne
WB4OGM

On Monday, August 25, 2025 at 05:05:27 AM MDT, David Stinson <arc5 at ix.netcom.com> wrote: 

 I'd bet coffee and donuts the root of this is going to be 
a Hi-Z ground in the bypass/noise.
I'm running into a LOT of Hi=Z grounds these days.
When I get to work on something ;-)

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