[Elecraft] K3 not communicating with PC

[Wes Stewart]

I agree that the transistor is likely not an issue.  However, Lyle did write: "About a year ago we changed the transistor used in this 
oscillator to a higher-gain device because a small number of KIO3 
modules had marginal negative voltage."

Unless I'm mistaken, it seems to me that holding the K3 blameless and suggesting that it's something else, is not necessarily a definitive answer.  Believe it or not, the KIO3 could actually be defective.  I know that this is heresy in this forum, but nothing's perfect :-)



- On Fri, 1/8/10, Mike <nf4l at nf4l.com> wrote:

From: Mike <nf4l at nf4l.com>
Subject: Re: [Elecraft] K3 not communicating with PC
To: 
Cc: elecraft at mailman.qth.net, "Roger Dallimore" <mw0idx at rgdw.fsnet.co.uk>
Date: Friday, January 8, 2010, 6:41 PM

I agree also. Try a different device on the cable, like a digital 
camera, or an iPOD, or a GPS, or......

73, Mike NF4L

Don Wilhelm wrote:
> Roger,
>
> I do not believe the transistors on the IO board should be very high on 
> the suspect list.  It is rare to find a component failure unless it has 
> been subjected to some unusual stress - component degradation in 3 years 
> or less is highly unlikely, 20 to 40 years, maybe, but not 3.
> May I suggest that the KUSB itself would have the highest probability of 
> failure, and your tests so far have not done anything to check it (other 
> than the checks from the computer device manager).  The adapter could 
> have something as subtle as a broken wire in the cable.
> Can you try another adapter, or better yet, try using a computer with a 
> real serial port.
>
> 73,
> Don W3FPR
>