2nd Report
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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* ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Yeah the fans are pretty noisy especially when CQing without answers which keeps the amp duty cycle high. At least when you get answers the amp has a chanceto cool just a bit and keep it below 70C which is where the hyper drive fans come into play, hi. I'm still happy with the amp for several reasons but I still prefer tube amps.I thought I would have two Acom 2000a's but when I saw the new 1500 I figured I would take the solid state plunge for instant on capability but I still prefer my 2000.Tube amps have the same speed fans no matter how hot and how many CQ's you call. The 1500 sits on top of the Acom quite nicely though, that couldn't happen withtwo Acoms, hi.
A friend of mine keeps his amps in the basement with his shack upstairs. He is awaiting his 1500 to return from Elecraft for a repair but I already emailed him and toldhim he definitely would like to remote the 1500 to the basement, hi. I could use the Acom more for running somewhat but I was giving the 1500 a pretty rigorous testover the weekend. I don't know how well noise cancelling headphones will do with the 1500 fans when they start singing over 70C. I keep the manual speed to at least2 while contesting and sometimes 3. It helps to get the temp to stay lower for longer periods while the duty cycle subsides. First big contest test of the 1500. BillK3WJV On Monday, May 28, 2018, 10:24:43 AM EDT, Richard Zalewski <[hidden email]> 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* ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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What broke on your friends KPA-1500?
- Paul KW7Y At 07:45 AM 5/28/2018, Bill Stravinsky via Elecraft wrote: > Yeah the fans are pretty noisy especially when > CQing without answers which keeps the amp duty > cycle high. At least when you get answers the > amp has a chanceto cool just a bit and keep it > below 70C which is where the hyper drive fans > come into play, hi. I'm still happy with the > amp for several reasons but I still prefer tube > amps.I thought I would have two Acom 2000a's > but when I saw the new 1500 I figured I would > take the solid state plunge for instant on > capability but I still prefer my 2000.Tube amps > have the same speed fans no matter how hot and > how many CQ's you call. The 1500 sits on top > of the Acom quite nicely though, that couldn't > happen withtwo Acoms, hi. A friend of mine > keeps his amps in the basement with his shack > upstairs. He is awaiting his 1500 to return > from Elecraft for a repair but I already > emailed him and toldhim he definitely would > like to remote the 1500 to the basement, > hi. I could use the Acom more for running > somewhat but I was giving the 1500 a pretty > rigorous testover the weekend. I don't know > how well noise cancelling headphones will do > with the 1500 fans when they start singing over > 70C. I keep the manual speed to at least2 > while contesting and sometimes 3. It helps to > get the temp to stay lower for longer periods > while the duty cycle subsides. First big > contest test of the 1500. BillK3WJV On > Monday, May 28, 2018, 10:24:43 AM EDT, Richard > Zalewski <[hidden email]> 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* > ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm Post: > mailto:[hidden email] This list > hosted by: http://www.qsl.net Please help > support this email list: > http://www.qsl.net/donate.html Message > delivered to > [hidden email] > ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm Post: > mailto:[hidden email] This list > hosted by: http://www.qsl.net Please help > support this email list: > http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Richard Zalewski
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* > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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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* >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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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 <[hidden email]> 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* >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [hidden email] >>> >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Any chance you have the ability to capture and send me spectrograms at
each fan setting? I'd like to get some appreciation for the frequency and amplitude "manifest". One of my amateur radio mentors just received his KPA-1500, but he's recovering from triple bypass in the hospital, so I can't even get a good look at one... At least I could get some exterior high res images and relevant dimensions. Also, can someone send me the precise make and model of the fans being used? 73, ______________________ Clay Autery, KY5G (318) 518-1389 On 05/28/18 15:46, Richard Zalewski wrote: > 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 <[hidden email]> > wrote: Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Paul Baldock
The operator.
All is well 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Paul Baldock Sent: Monday, May 28, 2018 11:04 AM To: Bill Stravinsky <[hidden email]>; Elecraft Reflector <[hidden email]> Subject: Re: [Elecraft] 2nd Report What broke on your friends KPA-1500? - Paul KW7Y At 07:45 AM 5/28/2018, Bill Stravinsky via Elecraft wrote: > Yeah the fans are pretty noisy especially when CQing without answers > which keeps the amp duty cycle high. At least when you get answers > the amp has a chanceto cool just a bit and keep it below 70C which is > where the hyper drive fans come into play, hi. I'm still happy with > the amp for several reasons but I still prefer tube amps.I thought I > would have two Acom 2000a's but when I saw the new 1500 I figured I > would take the solid state plunge for instant on capability but I > still prefer my 2000.Tube amps have the same speed fans no matter how > hot and how many CQ's you call. The 1500 sits on top of the Acom > quite nicely though, that couldn't happen withtwo Acoms, hi. A friend > of mine keeps his amps in the basement with his shack upstairs. He > is awaiting his 1500 to return from Elecraft for a repair but I > already emailed him and toldhim he definitely would like to remote the > 1500 to the basement, hi. I could use the Acom more for running > somewhat but I was giving the 1500 a pretty rigorous testover the > weekend. I don't know how well noise cancelling headphones will do > with the 1500 fans when they start singing over 70C. I keep the > manual speed to at least2 while contesting and sometimes 3. It helps > to get the temp to stay lower for longer periods while the duty cycle > subsides. First big > contest test of the 1500. BillK3WJV On > Monday, May 28, 2018, 10:24:43 AM EDT, Richard Zalewski > <[hidden email]> 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* ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm Post: > mailto:[hidden email] This list hosted by: > http://www.qsl.net Please help support this email list: > http://www.qsl.net/donate.html Message delivered to [hidden email] > ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm Post: > mailto:[hidden email] This list hosted by: > http://www.qsl.net Please help support this email list: > http://www.qsl.net/donate.html Message delivered to > [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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