I use oxygen-depleted speaker wire for all my wire antennas. It's the
reason why I can work stations that others can't even hear. Occasionally,
those stations are even using RF, but most of the time I can directly hear
the key clicks from their key disturbing the overly-oxygenated air at the
key gap. I DO have problems when a ham is using an electronic keyer, and
must rely on receiving the actual RF signal in those cases.
What, you call me an air-head? My brain has been oxygen-depleted for years,
and I LIKE IT!
73, Terry, WB4JFI
-----Original Message-----
From: Wes (N7WS)
Sent: Tuesday, July 23, 2013 4:52 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Audio circuit distortion
Are you one of those guys who can hear the difference in speaker wire?
I had a guy working for me who was a musician and audiophile who claimed he
could tell the difference. I referred him to Bob Pease.
On 7/23/2013 1:22 PM, Wayne Burdick wrote:
Don Putnick <don.n...@earthlink.net> wrote:
I watched the presentation again. Yes, Rob said the K3 was fixed in 2008.
He also said the fix wasn't as good as he'd like. It didn't compete with
the <0.3% distortion of the Icom 756 Pro III. So if you look at the
distortion products at 44:20, would the average amateur (like me) be able
to hear that?
Short answer: No.
I have excellent hearing (I'm an acoustic guitarist and pianist in my
"spare time"), and after we made all the updates to the K3, I burned quite
a bit of lab time trying to hear what Rob was talking about. I tried
*really* hard, as did my staff. We couldn't hear it. Rob is superhuman :)
True, it would be possible to reclaim a bit of extra AF headroom by using
an AF amp that's heavily biased (class A). But 99% of operators would not
benefit, the radio would draw an extra 200-300 mA with no signal in
receive mode, and the chip(s) would need fairly extensive heat sinking.
Doesn't seem like a good tradeoff.
(Disclaimer: I'm biased towards energy efficiency and portability.)
Wayne
N6KR
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