"High isolation headphones" below means ~30 dB isolation from ambient noise. Heil does not make any in this range and most active noise reduction headphones (e.g. Bose) only have 10-15 dB. Here are some examples of what Barry meant:
http://www.extremeheadphones.com/ex-29.html http://www.sennheiserusa.com/private_headphones_dj-headphones_004974 http://www.etymotic.com/ephp/er6.aspx These are all available in the $75-100 range. 73, Bill Doug Turnbull wrote: > > Barry, Sorry but what do you mean by 'high isolation headphones'. Would > the Heil Pro-Set Plus do? > 73 Doug EI2CN > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Barry N1EU > Sent: 07 February 2010 01:01 > To: [email protected] > Subject: Re: [Elecraft] K3 in a cw pileup - needs work > > > > Barry N1EU wrote: >> >> You need to maximize your rf/af dynamic range - that is what is going to >> turn that mush into a beautiful symphony of distinct signals of varying >> levels. What has worked well for me is AGC off (although AGC on works >> fine as well), high isolation headphones, and the gain throttling >> techniques (most important) described by K3NA, W4ZV, myself, and others. >> > Just to continue from previous post - I experienced only mush in pileup > reception until fully adopting this technique. High isolation headphones > are critical because you want to set gain such that weak signals are > lightly > heard but clearly copiable. You're maximizing the receive dynamic range > delivered to your ears and the high isolation means you can clearly hear > fainter signals without turning up the gain and squashing the dynamic > range > (and too frequently engaging AF Limiter with AGC Off). > > 73, > Barry N1EU > > -- > View this message in context: > http://n2.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4527626.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > -- View this message in context: http://n2.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4528787.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
