[K3] K3 fan noise, part XXLIV

[Dave Hachadorian]

---------------------------
From: "Philippe Trottet" <[hidden email]>
Sent: Sunday, May 30, 2010 4:40 AM
To: <[hidden email]>; <[hidden email]>
Cc: "Elecraft List" <[hidden email]>
Subject: Re: [Elecraft] [K3] K3 fan noise, part XXLIV

> PA temp was rising up to 55ºC,  the 2 fans were not audible
> from my
> chair.
=======================

If you didn't exceed 55C, You may not have gotten to high speed
with that test. Here are the results of my fan speed vs. temp
test a while ago:

Time   Temp  Fan
0:00    26C   0
0:26    37    1
0:44    41    2
1:19    50    3
1:45    55    4
2:40    60    4
2:50    62    4
3:15    64    4
4:00    64    4

Room temp was 77F.

Dave Hachadorian, K6LL
Yuma, AZ






































.

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[Philippe Trottet]

Hi Dave,
For the test I progammed the fan to max, after the test I put them back
to auto.
I would have mentioned it.
Tks
Philippe A65BI

>>> "Dave Hachadorian" <[hidden email]> 30-05-2010 20:32 >>>
---------------------------
From: "Philippe Trottet" <[hidden email]>
Sent: Sunday, May 30, 2010 4:40 AM
To: <[hidden email]>; <[hidden email]>
Cc: "Elecraft List" <[hidden email]>
Subject: Re: [Elecraft] [K3] K3 fan noise, part XXLIV

> PA temp was rising up to 55ºC,  the 2 fans were not audible
> from my
> chair.
=======================

If you didn't exceed 55C, You may not have gotten to high speed
with that test. Here are the results of my fan speed vs. temp
test a while ago:

Time   Temp  Fan
0:00    26C   0
0:26    37    1
0:44    41    2
1:19    50    3
1:45    55    4
2:40    60    4
2:50    62    4
3:15    64    4
4:00    64    4

Room temp was 77F.

Dave Hachadorian, K6LL
Yuma, AZ






































.

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[Steve Ellington]

Google brings up many sources for Elina. Here's one:
http://www.myofficesupplyzone.com/2-193870011-B0038OT78G-Elina_HDF6015L12MB__60_x_60_x_15_mm_236_x_236_x_059_inches_12_Volt_Cooling_Fan

Steve
N4LQ
----- Original Message -----
From: "Joe Planisky" <[hidden email]>
To: "Elecraft List" <[hidden email]>
Sent: Thursday, May 27, 2010 2:28 PM
Subject: Re: [Elecraft] [K3] K3 fan noise, part XXLIV

> Since the responses to my inquiry about K3 fan brands/models have
> virtually stopped, I thought I'd post the results.  There are indeed
> at least 2 different fans in use in K3s:
>
> Elina HDF6015L-12LB-1 and UTEC AT6015L-12L2B-ND2 and ND5
>
> The Elina fans are made by Inaba Denki Sangyo, a Japanese company.
> You can find specs for this fan at
> http://www.europeanthermodynamics.com/Fans&Blowers/elina%20fan_eng.pdf
>
> The UTEC fans are made by United Thermal Engineering Corp. Their
> office is in San Jose, CA. but their factories are in Japan, Taiwan,
> and China.
> http://www.utecusa.com/products/pdffiles/pid_1-45-152_%28SPEC%29AT6015L-12L2B%20ND1%2812-22-08%29.pdf
>
> According to the published specs, the UTEC fans have a slightly higher
> rated speed (3000 rpm vs 2800 rpm), more airflow (15.4 cfm vs 10.6
> cfm), higher static pressure (2.21mm vs 1.5mm),and higher noise (24.8
> dBA vs 21 dBA) than the Elina fans.  They also operate over a wider
> range of voltages than the Elina fans (6-13.8v vs 10.2-13.8v).  Both
> use ball bearings.  Based just on the specs, I would expect the UTEC
> fans to be slightly more powerful and slightly louder.
>
> From the responses I received, it looks like the Elina fans were used
> on earlier K3s with serial numbers < 900 or so.
>
> I received responses from 13 people (including myself), covering 13
> K3s.  If the reporter used words or phrases like "quiet", "silent",
> "never hear them", I counted their response as "quiet".  If they used
> words or phrases like "loud", "annoying", "I can hear them", I counted
> their response as "loud"
>
> UTEC Quiet   3
> UTEC Loud:   4
> Elina Quiet: 6
> Elina Loud:  0
>
> With such a small sample of self-reported anecdotes of a subjective
> perception, the results of this little survey are statistically
> virtually meaningless.  However, they do suggest a direction for
> further research in that no one reported loud Elina fans.
>
> I may have a chance to do some side-by-side comparisons between my K3
> and an earlier SN K3 in a few weeks.  If that turns up anything
> interesting, I'll report it here.
>
> Thanks to everyone who took the time and effort to respond to my
> request.
>
> 73
> --
> Joe KB8AP
>
>
> On May 23, 2010, at 9:19 AM, Joe Planisky wrote:
>
>> The topic of K3 fan noise seems to come up every now and then, and
>> each time it does there's a chorus of people who say the fans in their
>> K3 are absolutely silent, and an equal chorus of people who say the
>> fans are clearly audible.
>>
>> ...
>
>> However, I'm also wondering if Elecraft has changed brands or models
>> of fans from time to time.  It's possible that some brands/models
>> might be quieter than others.
>
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[Andrew Moore-3]

Joe Planisky <[hidden email]>:
> Since the responses to my inquiry about K3 fan brands/models have
> virtually stopped, I thought I'd post the results.

It's also worth checking sites like silentpcreview.com, buildsilentpc.com,
endpcnoise.com, etc. for near-silent fans.

..
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[Joe Planisky]

That's a 12MB (medium speed), not a 12LB (low speed).  3700 RPM max vs  
2800 RPM max.  Not the same thing.

73
--
Joe KB8AP

On Jul 2, 2010, at 6:11 PM, Steve Ellington wrote:

> Google brings up many sources for Elina. Here's one:
> http://www.myofficesupplyzone.com/2-193870011-B0038OT78G-Elina_HDF6015L12MB__60_x_60_x_15_mm_236_x_236_x_059_inches_12_Volt_Cooling_Fan
>
> Steve
> N4LQ

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[Don Wilhelm-4]

To compare apples to apples where it is important, compare the CFM
rating at low, medium and high speeds.  The RPM is only indirectly
related to the air moving capabilities.  Things like blade shape,
ducting, and other similar parameters all contribute to the fan
efficiency and the amount of noise that is induced at any fan speed.

73,
Don W3FPR

Joe Planisky wrote:
> That's a 12MB (medium speed), not a 12LB (low speed).  3700 RPM max vs  
> 2800 RPM max.  Not the same thing.
>
>  
>
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