[Milsurplus] TCK-4

[Richard]

Well, yes, there are limits.  For my TBW I use an 800-1 800 cycle 
aircraft inverter, also known as a screaming Mimi.  I measured 90 dB at 
three feet, about the same as a subway train running through the shack.  
It's all from magnetostriction; someone thought the bearings were 
grinding, disabled excitation, and only heard some bearing noise and 
windage. I tried putting it out on the porch, which broadcast the noise 
to the neighborhood and they would have been throwing rocks at me.  The 
solution was a noise-reducing box, 3/4 inch plywood lined with 2 inch 
thick fiberglass batts.  The inverter throws off significant heat so I 
had two chimneys also lined with 2 inch fiberglass, to pass air in and 
out, with the blower inside.  This knocks the noise down to 50 dB, and 
depending where you're standing you nothing or a distant whine, which 
really impresses visiting firemen.

If you go this route, glue and screw all joints, and put a bead of putty 
inside, because an insignificant gap can pass lots of noise.

Richard, AA1P


On 02/09/2017 02:50 PM, w8au at sssnet.com wrote:
> Have you ever been near the motor-generator room of a ship or
> location having big TBK-TBM transmitters?   Not fun! :-)  You will 
> have to
> wear earphones to cut down the 100 dB+ noise.
>
> Perry    w8au
>
>
>
> At 02:27 PM 2/9/2017, Kenneth G. Gordon wrote:
>> On 9 Feb 2017 at 15:40, arc5 at ix.netcom.com wrote:
>>
>> > I adore the sound of dynamotors in my shack.  Bigger the better. Like
>> > having you own, personal
>> > locomotive.
>>
>> To me, they sound kinda like a jet engine. I love the sound.
>>
>> Ken W7EKB
>>
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