Re: K3 in a cw pileup - needs work

Posted by Bill W4ZV on Feb 07, 2010; 11:21am
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4528787.html

"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: [e-mail]
[mailto:[e-mail]] On Behalf Of Barry N1EU
Sent: 07 February 2010 01:01
To: [e-mail]
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

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