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

[Jack Smith]

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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