[Elecraft] [K3] in-band-IMD test

[Bill Maddock]

Anyone know at S/N # the new K3's started being changed to new
resistor?

Thanks and 73,

Bill  N4ZI


--- On Wed, 11/12/08, Joe Subich, W4TV <lists at microham-usa.com> wrote:

> From: Joe Subich, W4TV <lists at microham-usa.com>
> Subject: RE: [Elecraft] [K3] in-band-IMD test
> To: "'Jack Smith'" <jack.smith at cliftonlaboratories.com>, elecraft at mailman.qth.net
> Date: Wednesday, November 12, 2008, 4:37 PM
> > This is an issue with the isolation transformers in the
> LINE 
> > OUT ports.  I've measured similar levels, and
> shown how they 
> > might be reduced. 
> >
> http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm
> 
> Elecraft have changed the series resistors from 604 to 50
> Ohms 
> in current production.  See the October schematic updates
> on 
> their web site. 
> 
> I'm assuming a change in the schematics indicates the
> modification 
> is now "approved." 
> 
> 
> 73, 
> 
>    ... Joe, W4TV 
>  
> 
> 
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net 
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> Jack Smith
> > Sent: Wednesday, November 12, 2008 4:24 PM
> > To: Alexander Ponomarenko; 'Elecraft'
> > Subject: Re: [Elecraft] [K3] in-band-IMD test
> > 
> > 
> > Alex:
> > 
> > This is an issue with the isolation transformers in
> the LINE 
> > OUT ports. 
> > I've measured similar levels, and shown how they
> might be 
> > reduced. 
> >
> http://www.cliftonlaboratories.com/elecraft_k3_receive_audio.htm
> > 
> > You will not see  the same degree of distortion on the
> 
> > headphone output 
> > port.
> > 
> > Jack K8ZOA
> > 
> > 
> > Alexander Ponomarenko wrote:
> > > GA for all K3 users.
> > > So many guys has talks about perfect audio sound
> of K3.
> > > So many talks about "analog K3 sound"
> on e-ham.
> > > But how it possible if K3 have the so bad in-band
> IMD?
> > > You can read about
> "in-band-IMD-measurements" in russian here: 
> > > 
> >
> http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&
> > > start=0
> > >
> > > Or you can simply look on the pictures, where is
> in-band
> > > IMD-measurements of
> > > SDR-5000, IC-7800, IC-756pro2 and K3 - so bad for
> HI-FI sound 
> > > announced by many K3-users:
> > > it's for S9-level
> http://forum.cqham.ru/download.php?id=31966
> > > and it's for S9+50 level
> http://forum.cqham.ru/download.php?id=32004
> > > and even measurements of S/S+N-rate is poor: 
> > > http://forum.cqham.ru/download.php?id=32003
> > >
> > > Alex de UR5LAM
> > > RU-QRP-C#103
> > > K3/100F #0568
> 
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