Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Bill Stravinsky via Elecraft 
 Feel free to do that with your kpa1500.  While you're at it test how long it 
takes to reach 60C with and without the modified fan system.I'm comfy with 
hearing the fans come on and I even set the fan speed to 1 or 2 if I'm in a 
contest mode.  I don't think there's a thing astoo much cooling for a solid 
state amp running 1500 watts.  The brief time I've played with mine it doesn't 
take too long to get to 60Cif you xmit enough.
Good luck.
BillK3WJV

On Monday, May 21, 2018, 5:11:01 PM EDT, hawley, charles j jr 
<c-haw...@illinois.edu> wrote:  
 
 Seems like if the internal fans don't go on, that means the fan on the top is 
cooling the amp.

Chuck Hawley
 c-haw...@illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles

From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
behalf of Bill Stravinsky via Elecraft [elecraft@mailman.qth.net]
Sent: Monday, May 21, 2018 8:01 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] KPA1500 fan speeds and fan noise

 That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in the 
rear.
BillK3WJV

    On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe <k...@ncn.net> wrote:

 All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans do not come
on -- a vast improvement for a few bucks. When you go portable, just leave
'em home.

73,    Roy        K6XK












__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k3...@yahoo.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to c-haw...@illinois.edu
  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread hawley, charles j jr 
Seems like if the internal fans don't go on, that means the fan on the top is 
cooling the amp.

Chuck Hawley
 c-haw...@illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles

From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
behalf of Bill Stravinsky via Elecraft [elecraft@mailman.qth.net]
Sent: Monday, May 21, 2018 8:01 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] KPA1500 fan speeds and fan noise

 That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in the 
rear.
BillK3WJV

On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe <k...@ncn.net> wrote:

 All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans do not come
on -- a vast improvement for a few bucks. When you go portable, just leave
'em home.

73,RoyK6XK












__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k3...@yahoo.com

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to c-haw...@illinois.edu
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Walter Underwood 
> On May 21, 2018, at 1:56 PM, Bill Stravinsky via Elecraft 
>  wrote:
> 
> If you are going to depend on those 2 fans sucking hot air out of the amp 
> instead of using the internal fans that push it where it needs to go, I think 
> you arepulling hot air out of the amp and that hot air has already done its 
> damage.
> BillK3WJV


And pulling cool air in, probably through those big holes with fans in them, 
right where it needs to go. And if the amp gets hot, the built-in fans come on.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Bill Stravinsky via Elecraft 
 If you are going to depend on those 2 fans sucking hot air out of the amp 
instead of using the internal fans that push it where it needs to go, I think 
you arepulling hot air out of the amp and that hot air has already done its 
damage.
BillK3WJV

On Monday, May 21, 2018, 3:29:29 PM EDT, Roy Koeppe  wrote:  
 
 Yes it does, normally air flow is from rear to top. The fans placed over the 
exhaust vent on top create a partial vacuum, drawing in air through the idle 
(or running) fans on the rear apron and out the top just like when the 
regular fans are doing that job.

Roy    K6XK


"That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in 
the rear."
BillK3WJV

    On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe  
wrote:

All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans do not come
on -- a vast improvement for a few bucks. When you go portable, just leave
'em home.

73,    Roy        K6XK



__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k3...@yahoo.com
  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Roy Koeppe 
Yes it does, normally air flow is from rear to top. The fans placed over the 
exhaust vent on top create a partial vacuum, drawing in air through the idle 
(or running) fans on the rear apron and out the top just like when the 
regular fans are doing that job.


RoyK6XK


"That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in 
the rear."

BillK3WJV

   On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe  
wrote:


All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans do not come
on -- a vast improvement for a few bucks. When you go portable, just leave
'em home.

73,RoyK6XK



__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Ed Gray W0SD 
I have a KPA-1500  #171 and when I set the fans at 1 the air is being 
pulled from the back by only the middle fan on  the back. The air is 
exiting out the top cover, front, right.  This exit area is just a 
little over 5" x 8".  I feel a good deal of air coming out the top 
evenly distributed over the 5" x 8" area.


Set at position 2, 3, 4 and 5 all three fans run and the fan speed is 
increased with each setting.  2 is IMHO is not very noisy, 3 is more 
noise than I like if ran continuously. Sporadically would be OK assuming 
it would not be needed a lot. 4 and especially 5 are noisy.  However I 
would think you would only need 4 or 5 with lots of TX in RTTY or WSJT 
modes so one would not need to be concerned about mic pick up however I 
will say 4 and 5 are not pleasant to listen to.  More to be learned by 
me but I suspect letting the fan be regulated by the temperature rather 
than a fixed setting may be the way to go for lots of TX in RTTY or WSJT.


Anyway the air comes in the back and goes out the top cover on the KPA-1500.

Ed W0SD



On 5/21/2018 9:13 AM, ANDY DURBIN wrote:

>From the KPA500 kit build manual:

"If airflow arrows are visible on the fan housing, they will show that air will be 
blown out of the back of the KPA500."


It was a bit surprising to me that the KPA500 fan airflow is the opposite of 
natural convective flow but I accepted that was the intended design.  My KPA500 
fan does pull air in the top and exhaust it out of the back.


"They are running on a 19-volt supply at a slow but effective cooling speed and are 
very quiet (drawing air upward)."


Do the KPA1500 fans push air into the box? If so, why doesn't the KPA500 fan do 
that. If the KPA1500 fans pull out of the box why would it be appropriate to 
use an additional fan that opposes this airflow?


73,

Andy k3wyc
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to w...@triotel.net





__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Bill Stravinsky via Elecraft 
 That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in the 
rear.
BillK3WJV

On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe  wrote:  
 
 All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch 
tall rubber feet covering the top exhaust vent on amp. They are running on a 
19-volt supply at a slow but effective cooling speed and are very quiet 
(drawing air upward). During normal CW rag chewing the main fans do not come 
on -- a vast improvement for a few bucks. When you go portable, just leave 
'em home.

73,    Roy        K6XK












__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k3...@yahoo.com
  
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] KPA1500 fan speeds and fan noise

2018-05-21 Thread Roy Koeppe 

All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch 
tall rubber feet covering the top exhaust vent on amp. They are running on a 
19-volt supply at a slow but effective cooling speed and are very quiet 
(drawing air upward). During normal CW rag chewing the main fans do not come 
on -- a vast improvement for a few bucks. When you go portable, just leave 
'em home.


73,Roy K6XK












__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com