[Elecraft] 2nd Report

[Richard Zalewski]

Good discussion.  For giggles I ran sound meter at my op position.  About 1
ft below where my head would be so readings would be higher at head level.
Fan Speed   Level (db)
1                  50
2                  59
3                  65
4                 70
5                 75

So it is going to take some good headsets to help significantly.


Richard
*W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV


*Be joyful in hope, patient in affliction, faithful in prayer*

On Mon, May 28, 2018 at 8:50 AM, Bob McGraw K4TAX <rmcgraw at blomand.net>
wrote:

> Although making things a bit larger physically, fans enclosed into the
> equipment case, thus providing some acoustic dampening, and configured to
> pull air into the case {along with much of the noise} and exhausting air
> and noise through several ports is more applicable to reducing overall
> noise.  High volume air moved at slow rates is much quieter than the same
> amount of high volume air moved at faster rates.    Also, fans with a lower
> blade tip velocity makes less noise.
>
> As I indicated in an earlier post, some fans are more efficient at
> "blowing" i.e pressurizing the enclosure, while others are more efficient
> at "sucking" thus evacuating the enclosure.  In general, sound moves with
> the air flow.
>
> 73
>
> Bob, K4TAX
>
>
>
> On 5/28/2018 10:10 AM, Drew AF2Z wrote:
>
>> No KPA1500 here but I did replace the fans on my lil' ol KPA3 with
>> Noctuas. They are noticeably quieter. If there is a suitable Noctua
>> replacement for the KPA1500 fans you might want to compare the sound level
>> specs to the Sanyo Denkis.
>>
>> Wonder if it would be possible to build an active noise cancelling system
>> into the rig itself; seems like it would work in that enclosed space...
>>
>> 73,
>> Drew
>> AF2Z
>>
>>
>>
>> On 05/28/18 10:20, Richard Zalewski wrote:
>>
>>> First major contest with KPA-1500. Overall VERY pleased.  No glitches
>>> other than a few operator errors early in the contest.  Loving the amp.
>>>
>>> Fan noise...another issue.  Usually for a cw contest I use some old ear
>>> buds.  Not possible with the amp.  Had to use the total ear muffs and
>>> still
>>> quite noisy.  Did not effect my performance but it is annoying. I can not
>>> imagine what it was like before they released the amp to general public
>>> when they changed the fans...made them less noisy???  Still needs some
>>> work
>>> but at this point probably not possible.  So looking for suggestions for
>>> reasonably priced noise cancelling headset with mic if possible.
>>>
>>> Hope we get full explanation of what gets changed in the next firmware
>>> release.
>>>
>>> Still smiling.
>>>
>>> Richard
>>> *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
>>> J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV
>>>
>>>
>>> *Be joyful in hope, patient in affliction, faithful in prayer*
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>
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