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

[Alexander Ponomarenko]

Jack,

all these measurements, for all radios has been via PHONE-OUT.
There is two-tone measurements, but you can see these IMD even with XG1 
set to s9-level.
Here is my K3 with s9-signal from XG1:
- ATT On http://forum.cqham.ru/download.php?id=32030
- ATT/PRE Off http://forum.cqham.ru/download.php?id=32031
- PRE On (it's terrible)  http://forum.cqham.ru/download.php?id=32032

P.S. Yes, I visited clifton-web, line-out has same distortion as 
phone-out. :-(

Alex de UR5LAM

Jack Smith wrote:
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