Thanks Chris, I do not think I will buy the current configuration of the KPA-1500 fans. I was seriously doing so...... I would still like to know the model number of the fans..... Mel, K6KBE
From: "Chris Codella, W2PA" <w...@arrl.net> To: elecraft@mailman.qth.net Sent: Saturday, June 2, 2018 4:14 PM Subject: [Elecraft] KPA-1500 Fan Noise - measured (sort of) In an attempt to quantify this, I installed OSHA's free NIOSH app, which measures noise, onto my iPhone 7 and tried it out. It's not a measurement instrument, mind you, so the absolute numbers are highly questionable. But the relative numbers are interesting. I held the phone at eye level between me and my computer monitor, about 2 feet from the amplifiers. Here are the results: dB measured with NIOSH app, rounded to two significant digits: 46 - for comparison - an Alpha 89 running as normal 48 - KPA1500 at fan level 0 (i.e. PS fans only) 51 - fan level 1 (i.e. center fan plus PS fans) 57 - fan level 2 (all fans on) 64 - fan level 3 (all fans on) 67 - fan level 4 (all fans on) 76 - fan level 5 (all fans on) Similar to other comments I've read, I find up through level 2 to be okay. At 3 and above I need headphones or, better still, noise cancelling ones. My experience thus far is that on SSB in normal conversation at 1500W it stays at level 0 with an occasional excursion into level 1 if I'm long winded. In the CW WPX test last weekend, strictly in S&P mode, it stayed at level 0. Experiments with CQing and on FT-8 are yet to come and I'm sure will require higher speeds. 73, Chris, W2PA ______________________________________________________________ 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 farrerfo...@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