Eric, My KPA1500 RF deck is mounted on a high shelf, and the power supply is on low shelf below the desk. I have the fan speed on the RF deck set to 2 as a minimum. I almost never notice the PS fans, when I hear noise it is the RF deck. During the ARRL DX CW the fans reached 4 and it was loud enough to need headphones, in most operation it is not. The PS noise you are describing does not seem normal to me. Can you make a video/audio recording and post it on the web somewhere?
73 John N5CQ -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Eric Norris Sent: Tuesday, June 11, 2019 3:47 AM To: Peter Hall <[email protected]> Cc: elecraft@mailman qth. net <[email protected]> Subject: Re: [Elecraft] KPA1500 Power Supply Fan Noise Apparently I was not clear enough in my message. It is the PSU fan noise that is deafening, not the RF deck. Like Peter, my PSU sits on the floor underneath a wooden operating desk that holds the rest of the K-line. The noise from the PSU is high-pitched and piercing. The only thing I can liken it to is a four-rotor Mazda prototype IMSA GTP race car from the early 90s. Brain-piercing, tear-your-hair-out, heard-from-every room-in-the-house louder than hell, and has been so since the day it darkened my doorway--with the RF deck at idle. 73 Eric WD6DBM On Tue, Jun 11, 2019, 12:54 AM Peter Hall <[email protected]> wrote: > Hello Eric > > There's no doubt that a KPA1500 physical installation needs some > careful attention to the noise aspect. That said, I'm a bit surprised > by your problem with the PSU fan. I can certainly hear mine but, > overall, the noise is entirely dominated by the RF deck fans. I've > located the PSU under my operating desk, which is made of a dense > particleboard material. > The RF deck sits alongside my TS-890S transceiver on the desk. I can hear > the PSU fan if I put my head below desk level but, even then, I don't > find the fan to be particularly high-pitched in its acoustic output. > Could you possibly have a faulty fan (maybe excess nearing noise)? > > On the other hand, I do find the RF deck fans test my patience a bit, > especially since the last round of major firmware updates which start > the cooling at a lower heatsink temperature. That probably works well > in a high-output environment, where it no doubt delays the onset of > heat soaking. But when the amplifier "loafs" in a low power, low duty > cycle environment as it does in some of my applications. it just > starts the noise prematurely. It'd be great to see something like an > "80m rag-chew" option for those times! > > 73, Peter (VK6HP). > > -----Original Message----- > From: [email protected] > <[email protected]> > On Behalf Of eric norris via Elecraft > Sent: Tuesday, 11 June 2019 7:57 AM > To: [email protected]; [email protected]; Elecraft Reflector < > [email protected]> > Subject: [Elecraft] KPA1500 Power Supply Fan Noise > > More broadly, has there been any progress on reducing the piercing > power supply fan noise on the KPA1500 when only using it as a tuner or > an antenna switch? I complained about this a year ago, and I find it > completely unacceptable. No set of noise-reducing headphones that I > have tried works well enough to make the noise tolerable. I've tried > moving the PS deck around with minimal improvement. This just doesn't > seem to fit Elecraft's philosophy of a quiet operating environment. > Why do these fans have to operate at full throttle when there is > minimal current draw from the rf deck? Why do these fans create such > a piercing high-pitched note? If there is no response from Elecraft, > what have other ops done--short of moving the PS into an adjoining room--to > mitigate the scream? > Thanks, > 73 Eric WD6DBM > > Sent from Yahoo Mail on Android > ______________________________________________________________ > Elecraft mailing list > Home: > https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsecur > e-web.cisco.com%2F1tDsvUQJ_0zB23ghHb5KaAdzs0lJaKMogNen4iI_PDswSPolixJJ > 3iMrhUoFvfGgoxzbs0DGdGSSJL9x3VyZATgBP4zclJcBHotmk4r96__2YQRTeAi6FCpWxX > ILQqJ_IxPGZP8io4Yy2gzRdGerK7srzNw90BfE_ZOAFkDwLUzXowtU4dDgAziktXM2CaF_ > pmpCeXLxJMFjA6FB5k-74EYEqFaZkzaoXClH4rDm6FUv8b4ZNQGrysSjhXPwBuTRHw19Pi > QDvbA8aslrCqhIoTpUDEqhWyCBPw6pdw7_6qf-3cJoI6RgsgqLVHJhpZrhjT4EJ_rhWSPH > F7dkhVbZQFcqVIrSZP2cIvpbhns4oqu5yxQUlH-vLCJf6b3seCrDPHKM12n7oEwMzs5agf > comTpSv2qGLxI-g2jcswmHrXHnp9W52FpbNKXl6CW2lRdQCpkMg0-jSAQ99VrIWXI1Pu0I > CX96UOyhS7gYoOxWpTEE%2Fhttp%253A%252F%252Fmailman.qth.net%252Fmailman% > 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