Re: [Elecraft] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
On Sat,9/27/2014 5:54 AM, Don Wilhelm wrote: Take a look at the K2 Auxiliary KPA100 Cooling Fan Yes. And almost any generic muffin fan will push some air across a heat sink or into a power amp to improve air flow. I have a couple of 12V vans with power poles on them that I deploy as needed. One of my cats, now deceased, used to sleep on top of the heat sink for my K2/100, with her tail draped over the front of the radio. 73, Jim K9YC __ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
Before selling my KPA100 and KAT100, I used my K2 in RTTY contests. I stuck an old computer brushless DC muffin fan down over the warmest part with a little square of velcro, blowing down. I could run 100W [generally didn't but could] and the heat sink stayed almost cool. I don't think you have to move very much air over it to keep it cool. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org On 9/28/2014 12:18 AM, Jim Brown wrote: On Sat,9/27/2014 5:54 AM, Don Wilhelm wrote: Take a look at the K2 Auxiliary KPA100 Cooling Fan Yes. And almost any generic muffin fan will push some air across a heat sink or into a power amp to improve air flow. I have a couple of 12V vans with power poles on them that I deploy as needed. 73, Jim K9YC __ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
My point is to avoid using fans to cool this radio so as not to aid in depleting the batteries in this emergency radio go box, while creating additional noise for the operator. I'm on the fence as whether to take this K2/100 down to a machine shop and see what they can do to place a more adequate heat sink on it, or instead just install my Yaesu FT100D. In the past, I had purchased a 3 1/4 size fan to cool the K2/100, but it wasn't enough. I then purchased a second one and ran them both to keep the heat manageable. In doing so, the whine/noise that the fans had created had forced me to operate with headphones. This was a very annoying experience. I think a larger heat sink will work for me, I simply need to find if any such animal exists for this radio (lid configuration). Thus why I posted here. Thank you all who have responded. I appreciate your time and knowledge shared. My hope is to use my K2/100 in my emergency radio go box. I love the radio in every other respect, except for the issue of it dissipating heat. Paul Metzger - K6EH -- Sent: Sunday, September 28, 2014 at 10:09 AM From: Fred Jensen k6...@foothill.net To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top) Before selling my KPA100 and KAT100, I used my K2 in RTTY contests. I stuck an old computer brushless DC muffin fan down over the warmest part with a little square of velcro, blowing down. I could run 100W [generally didn't but could] and the heat sink stayed almost cool. I don't think you have to move very much air over it to keep it cool. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org[http://www.cqp.org] On 9/28/2014 12:18 AM, Jim Brown wrote: On Sat,9/27/2014 5:54 AM, Don Wilhelm wrote: Take a look at the K2 Auxiliary KPA100 Cooling Fan Yes. And almost any generic muffin fan will push some air across a heat sink or into a power amp to improve air flow. I have a couple of 12V vans with power poles on them that I deploy as needed. 73, Jim K9YC __ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
I have never heard of a third party replacement heat sink for the K2/100. I run a 4 (120mm) computer case fan that the specs say draws all of .15 amps, 1.8 watts @ 12V, at full speed. It probably doesn't need to turn that fast to adequately cool the heat sink so the current draw could be much less. .15A or less current draw for a fan is insignificant, IMO, compared to the 20A the rig draws on transmit. If you want to save some battery turn the power down or decrease the duty cycle. On 9/28/2014 2:01 PM, Paul Metzger wrote: My point is to avoid using fans to cool this radio so as not to aid in depleting the batteries in this emergency radio go box, while creating additional noise for the operator. I'm on the fence as whether to take this K2/100 down to a machine shop and see what they can do to place a more adequate heat sink on it, or instead just install my Yaesu FT100D. In the past, I had purchased a 3 1/4 size fan to cool the K2/100, but it wasn't enough. I then purchased a second one and ran them both to keep the heat manageable. In doing so, the whine/noise that the fans had created had forced me to operate with headphones. This was a very annoying experience. I think a larger heat sink will work for me, I simply need to find if any such animal exists for this radio (lid configuration). Thus why I posted here. Thank you all who have responded. I appreciate your time and knowledge shared. My hope is to use my K2/100 in my emergency radio go box. I love the radio in every other respect, except for the issue of it dissipating heat. Paul Metzger - K6EH - -- R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #3441 __ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
No larger heat sink exists that I've heard of. I believe you said you run a high duty mode. If so, the existing heat sink should be fine if you back the power down to 25-30 W. Not so good at 100 W and high duty cycle. Phil W7OX On 9/28/14, 12:01 PM, Paul Metzger wrote: My point is to avoid using fans to cool this radio so as not to aid in depleting the batteries in this emergency radio go box, while creating additional noise for the operator. I'm on the fence as whether to take this K2/100 down to a machine shop and see what they can do to place a more adequate heat sink on it, or instead just install my Yaesu FT100D. In the past, I had purchased a 3 1/4 size fan to cool the K2/100, but it wasn't enough. I then purchased a second one and ran them both to keep the heat manageable. In doing so, the whine/noise that the fans had created had forced me to operate with headphones. This was a very annoying experience. I think a larger heat sink will work for me, I simply need to find if any such animal exists for this radio (lid configuration). Thus why I posted here. Thank you all who have responded. I appreciate your time and knowledge shared. My hope is to use my K2/100 in my emergency radio go box. I love the radio in every other respect, except for the issue of it dissipating heat. Paul Metzger - K6EH -- Sent: Sunday, September 28, 2014 at 10:09 AM From: Fred Jensen k6...@foothill.net To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top) Before selling my KPA100 and KAT100, I used my K2 in RTTY contests. I stuck an old computer brushless DC muffin fan down over the warmest part with a little square of velcro, blowing down. I could run 100W [generally didn't but could] and the heat sink stayed almost cool. I don't think you have to move very much air over it to keep it cool. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org[http://www.cqp.org] On 9/28/2014 12:18 AM, Jim Brown wrote: On Sat,9/27/2014 5:54 AM, Don Wilhelm wrote: Take a look at the K2 Auxiliary KPA100 Cooling Fan Yes. And almost any generic muffin fan will push some air across a heat sink or into a power amp to improve air flow. I have a couple of 12V vans with power poles on them that I deploy as needed. 73, Jim K9YC __ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
You could try 2 x 12V fans in series to give a bigger cooling area but smaller current; I did this once on a noise-critical application. In terms of S units at the other end, turning down the power, say 25% makes sense. David G3UNA I run a 4 (120mm) computer case fan that the specs say draws all of .15 amps, 1.8 watts @ 12V, at full speed. It probably doesn't need to turn that fast to adequately cool the heat sink so the current draw could be much less. .15A or less current draw for a fan is insignificant, IMO, compared to the 20A the rig draws on transmit. If you want to save some battery turn the power down or decrease the duty cycle. __ 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
[Elecraft] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
__ 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] Any larger or more efficient heatsinks available for the K2/100PA (radio lid/top)
Take a look at the K2 Auxiliary KPA100 Cooling Fan designed by Tom Hammond N0SS (SK). It is on his website maintained by the MMARC at http://www.mmccs.com/mmarc/n0ss/ Scroll down the opening page to K2 Specific Files, and then scroll down that page to the link to the pdf file. 73, Don W3FPR __ 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
