Re: What is high impedance
Posted by
drewko on
Feb 08, 2010; 10:52pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4537957.html
For my K3 I like using Koss SprtaPro headphones. They are 60-ohms,
very light, omfortable and non-fatiguing (but "high isolation" by no
means). They are collapsible and the headband can pivot to behind head
(so you don't muss up your 'do...) Lifetime warranty. They sound
really good to me, but may have too much bass for some. I think
they're great for CW.
73,
Drew
On Mon, 08 Feb 2010 15:47:52 -0600, David K0LUM wrote:
>After Lyle's comment (reproduced below), there has been been concern
>expressed about headsets of 120 to 600 ohms. A close reading of
>Lyle's words indicates that higher impedance is only a problem if
>there is a need to increase the AF gain too much. As long as you
>don't have to crank the AF gain way up there shouldn't be a problem.
>
>I think there is also some confusion about what high impedance means.
>The common WW II aircraft headset came in two versions High Z at
>4000 ohms and Low Z at 600 ohms. By that standard 120 ohms is very
>low and 600 is still low.
>
>If your AF gain is at 3 o'clock maybe your earphones or ears have too
>high an impedance.
>
>David K0LUM
>
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