[ARC5] Dynamotors and receivers

[J. Forster]

Bonding is very common, and generally believed to be a 'good thing'.
Virtually all shock mounts for avionics have metal bonding straps/loops. I
think that is part of the pourpose for the conical screw latches on the
racks.

-John

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




> On 6/9/2013 1:17 AM, Kenneth G. Gordon wrote:
>> Tonight, I tested an R-25 receiver I have been working on here by
>> powering
>> it with a DM-34 dynamotor. I first cleaned then greased the dynamotor's
>> bearings with that grease that Mike Hanz recommended.
>
> If you aren't already doing so, you might want to keep the tube of
> grease wrapped up in some paper towels and a plastic sack in your
> freezer.  It has a high oil saturation compared with other greases and
> will bleed on your shelf more, especially if you keep the tube in a
> vertical position.  Lowering the temperature and laying the tube
> horizontally will reduce that tendency.  In the tiny amounts present in
> a high speed motor bearing, the separation rate is optimal for
> lubrication, according to the Mobil engineer that I talked with about
> the tendency.
>
>> I was using clip-leads to connect everything together with. At first,
>> there was
>> some minor "crackling" noticeable in the audio, but when I connected the
>> frame of the dynamotor to the chassis of the receiver with another
>> clip-lead,
>> the crackling disappeared.
>
> Heh, heh...great minds think alike, Ken... :-)   ARC began adding a
> small pair of copper straps to the postwar receivers on diagonal shock
> mounts to accomplish essentially the same thing.  I think they began the
> practice with the R-23A in 1945, so they must have noticed the same thing.
>
>            73,
>   - Mike  KC4TOS
>
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