[Elecraft] [K3] Audio circuit distortion

[wb4jfi at knology.net]

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 at 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.na6z at 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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