I hope people do not make the mistake of using in-the-ear earbuds with ham radios, even the K3. These in-the-ear phones like the etymotic or the shure have to be put pretty deep into the ear canal to seal and provide isolation. They are wonderful for hi-fi. I use a pair by Shure to listen to Brahms on airplanes. BUT, they take at least a few seconds to extract from your ears. If, as has been reported on this reflector several times, the radio mis-functions and puts out a very loud audio signal, your ears will be fried before you can react.
DON'T DO IT!!!! Oliver W6ODJ On 7 Feb 2010, at 3:21 AM, Bill W4ZV wrote: > > "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 > ______________________________________________________________ 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
