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 <wa9ysd@yahoo.com>
> 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!>
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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