Re: K3 in a cw pileup - needs work

Posted by Brendan Minish on Feb 07, 2010; 1:13pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4529060.html

The High isolation headphones are of course only going to help if you
have much ambient noise in the shack.

I find my Beyerdynamic DT234PRO headset very good. It's not a very high
isolation headset but it's a fully closed design and my shack is
reasonably quiet

the DT234PRO is a headset that is produced for language lab type
applications and widely used by PC gamers too, it's comfortable to wear
for long periods of time and provides reasonable isolation from the
surroundings.

I get great audio reports from the microphone which is a back electoret
condenser with a cardioid pattern.
It has a presence peak (like most microphones intended for the spoken
word, Heil did not 'invent' this..)  and the cardioid pattern helps to
reduce pick-up of any ambient noise

It's completely Plug and play with the K3, plug it in the back and turn
Microphone bias.

I paid about 60 Euro for it on Ebay

73
Brendan EI6IZ


On Sun, 2010-02-07 at 03:21 -0800, 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: [hidden email]
> > [mailto:[hidden email]] On Behalf Of Barry N1EU
> > Sent: 07 February 2010 01:01
> > To: [hidden email]
> > 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:[hidden email]
> >
> > 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:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> >
>

--
73
Brendan EI6IZ

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html