All: A comment on active noise cancelling headsets. The Heil Quiet Phone Pro is a very different animal than the Bose headsets. I have a Heil QPP and on a scale of 5 it gets a zero. Mine oscillated right out of the box and was returned to Heil for repair, but then had a high amplitude noise peak at 1100 Hertz right on the brink of oscillation. Heil would not replace it, repair it, nor help with technical info so I could repair it myself. The Heil QPP was basically useless and ultimately failed from cracked plastic because of a stress riser design flaw. Extremely poor engineering and customer service. I have used a Bose QC-15 on 160M and agree with WA9YSD's assessment as to the hearing improvement in ambient noise. The CW seems to stand out a bit better with ANR than without. I do not know the improvement is ambient room noise suppression or if if the processing helps in other ways. In high QRN I run the K3 with minimal RF gain + maximum attenuation and use 450 Hz DSP BW through a 1-KHz filter and with fast AGC. Diversity also helps.
73, Steve AB4I > Date: Wed, 28 Mar 2012 07:19:14 -0700 (PDT) > From: Jim WA9YSD <[email protected]> > Subject: Re: Topband: how to hear through static crashes? > > 1. Bose QC-2 and QC-15 head phones take away from the constant static > pounding, much softer sound. They also help with week signals in the noise. > Also they help reduce the noise with fan and window shaker AC unites because > they are noise canceling head phones. Keep rechargeable batteries handy. I > believe ?Heil has noise canceling head phones as well and rumor has it that > they use the same circuit boards and Bose. > <SNIP!> _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
