[Elecraft] [K3] RE: K3 2-tone IMD test.

[Chuck - AE4CW]

Alex,

 

Thank you!  I am studying your mods and will report back if I decide to do
them.

 

Chuck, AE4CW

  _____  

From: Alexander Ponomarenko-5 (via Nabble)
[mailto:ml-user+44544-1724029560 at n2.nabble.com] 
Sent: Monday, September 28, 2009 12:50 PM
To: Chuck - AE4CW
Subject: Re: K3 2-tone IMD test.

 

Chuck, 

the most significant modification - the IF-amplifier buffer and AF-amplifier

circuit. 
The first mod helps to provide much smaller own noise level for K3 (10dB 
down !!!), 
and second mod takes more realistic sound. 
We talks about it earlier in the thread: 
 http://mailman.qth.net/pipermail/elecraft/2009-June/111985.html
 The mods for 1-st and 2-nd mixer can be helpful only for multi-TX 
high-power contest station. 
In any event, all pictures of  these mods here: 
http://ur5lam.jimdo.com/elecraft-k3-mod-s-page/
if you want to see the big photos, you find and download it here: 
http://forum.cqham.ru/viewtopic.php?t=17137
<http://forum.cqham.ru/viewtopic.php?t=17137&postdays=0&postorder=asc&&start
=870> &postdays=0&postorder=asc&&start=870
http://forum.cqham.ru/viewtopic.php?t=17137
<http://forum.cqham.ru/viewtopic.php?t=17137&postdays=0&postorder=asc&&start
=900> &postdays=0&postorder=asc&&start=900

All of these mods are not difficult. But results is very nice. 
My  K3 has much poor sound in A/B comparison with my small K2. 
But now, I have the new Radio, really excellent receiver and beautiful sound

after mods. 
I can hear the difference by my ear,  I can see the difference by my eyes on

the comparison plots. 

FW last beta 3.30 

73! GL! 
Alex UR5LAM 

2009/9/27 Chuck - AE4CW <[hidden email]
<http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3730559&i=0> > 


> 
> Alex, 
> 
> Can you please be specific about which HW mods you installed?  Are they
all 
> published by Elecraft?  I don't recall any 1st and 2nd Mixer mods being 
> published.  If not, can you please share them? 
> 
> Are the software mods in the current beta FW, i.e. 3.30? 
> 
> Thanks. 
> 
> Chuck, AE4CW 
> 
> 
> 
> Alexander Ponomarenko-5 wrote: 
> > 
> > Today we finished our K3 IMD-test in our home-laboratory. :) 
> > We has the nice results I think. 
> > Same improvements we have after modifications in hardware (mods for 1st 
> > and 2nd Mixer, IF-buffer and AF-amplifier). 
> > Same improvements we have after excellent software "AGC-mods" from Lyle 
> > Johnson. 
> > And here is the nice result in total. 
> > 
> > 2-tone-IMD-Plot for K3/100F BEFORE mods: 
> > http://forum.cqham.ru/download.php?id=48688
> > here we can see very dirty and nonlinear signal 
> > 
> > Plot for K3/100F AFTER hardware mods: 
> > http://forum.cqham.ru/download.php?id=48689
> > more clean and linear signal 
> > 
> > Plot for K3/100F AFTER hardware mods AND new AGC: 
> > http://forum.cqham.ru/download.php?id=48677
> > and nice result in total. 
> > 
> > GL! 73! 
> > Alex UR5LAM 
> 

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