See if you can borrow a hi quality aviation noise cancelling headset to try out. I have the now discontinued Sennheiser S1’s which work extremely well in many situations including with a single engine open cockpit aircraft, riding mowers, tractors, field day, etc. They have the added nicety of high quality adaptive noise cancelling and efficient noise cancelling the mic audio as well. Don’t look for “Heil Hi Fidelity” response of the mic. You will sound like you are on an aircraft radio but they cancel noise better than anything I have tested.
There a number of sets out there that probably perform at that level. David Clark, Bose, Lightspeed and others... I just happened on to a great deal for the Sennheisers. All run above the $500 mark retail... KD4IZ Sent from my iPhone > On Dec 9, 2018, at 11:40, CUTTER DAVID <d.cut...@ntlworld.com> wrote: > > Noise cancelling that I've come across is limited to low/medium frequencies. > If your hearing takes you higher, the noise-cancelling has finished by then. > This is probably not the ability of the sensing mic but the circuitry and/or > room acoustics, echo, etc. I'm a little out of date on the subject but > that's probably the essence of it. > David G3UNA > >> On 09 December 2018 at 15:26 "Dave Cole (NK7Z)" <d...@nk7z.net> wrote: >> >> >> As a guess, I would say the response of the mic used to derive the phase >> canceling audio does not adequately cover the audio noise spectrum of >> the 1500 puts out... Thus it can't phase cancel very well... >> >> That or your 1500 is filled with bad magic because it is supposed to be >> my KPA-1500 and it is mad at you. >> >> 73s and thanks, >> Dave (NK7Z/NNR0DC) >> https://www.nk7z.net >> ARRL Technical Specialist >> ARRL Volunteer Examiner >> ARRL OOC for Oregon >> >>> On 12/9/18 5:16 AM, eric norris via Elecraft wrote: >>> I have owned a pair of Heil noise-cancelling headphones for many years. >>> They worked very well to reduce the noise of my old AL-1200 amplifier, and >>> the 5 fans on my cantankerous man-killer Henry 2002A EME amplifier. >>> However, they are completely ineffective against the KPA1500. I bought a >>> pair of Bose noise-cancelling headphones recently, and they work much >>> better but are a bit tinny and eat batteries. >>> My question for the audio experts on this list is why don't the Heils work >>> with the KPA1500? Does anyone have a recommendation for a pair of really >>> good noise-cancelling headphones with a more flat response? >>> 73 Eric WD6DBM >>> >>> Sent from Yahoo Mail on Android >>> ______________________________________________________________ >>> 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 d...@nk7z.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 d.cut...@ntlworld.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
