[Elecraft] K3 Audio Upgrade Mod

[Bruce McLaughlin]

Please excuse my ignorance, but I have seen various references to the AF mod and I am not sure what it is supposed to do.  Also, where is it located?  I have the second receiver installed and I have a bad feeling that in order to get to it I'll have to tear things apart if I decide to do it.  Any info would be appreciated.

Bruce-W8FU

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Alexander Ponomarenko
Sent: Tuesday, December 09, 2008 4:51 PM
To: undisclosed-recipients:
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Audio Upgrade Mod

GA,

today I has same time for install K3-AF-mod (second part with R19 and 
R20). It was easy job. Yes, it's really worked! Now line-out are worked 
better! Here is plots "before" and "after" mod.

Line-OUT before replaced R19&R20: 
http://forum.cqham.ru/download.php?id=33360

And AFTER:
http://forum.cqham.ru/download.php?id=33361

And new R19&R20 on board :) :
http://forum.cqham.ru/download.php?id=33362

Guys from Clifton-labs are clever!

73!
Alex UR5LAM

Dr. James C. Garland wrote:

> The second part of the kit involves shunting two resistors with 51 ohm 
> resistors,  and here also Elecraft gives two options: one is to solder 
> 1/8w through-hole resistors onto the IO board, and the other is to 
> solder two tiny SMT (surface mount ) resistors piggy-back onto existing 
> SMT resistors. The kit comes with both kinds of resistors.  I elected to 
> do the SMT version of the mod, and here I’d recommend that owners opt 
> for the other method. I don’t see any advantage to doing the  SMT 
> version. It takes a very steady hand, a very small-tipped soldering 
> iron, and very good eyesight to piggy-back the two SMT resistors into 
> the circuit, and I just don’t see the reason for the hassle. It would 
> take five minutes to install the through-hole resistors, and the result 
> looks quite clean and neat.  I’d recommend also that Elecraft delete the 
> SMT option from the instructions. Took me about 30 mins to install the 
> SMT resistors, probably about half that time to install the through-hole 
> ones.
> 
>  
> 
> 73,
> 
>  
> 
> Jim W8ZR
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