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[K3] Low audio output after AF output mod

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Kari Sillanmaki

[K3] Low audio output after AF output mod

Hello group,

Instructions for the AF output mod specify that:
"This modification is needed for all K3s shipped approximately
before 01/12/09 containing either
a Revision "XB" or Revision "A" KIO3 board."

I have a K3 #310 with KIO3A board Revision XD.
The exact markings on the KIO main board read:
KIO3A MAIN
Rev XD
(c) 2007
ELECRAFT

The board did not have the 470R resistors installed,
so I installed them according to the instructions on
the Elecraft webpage.

Now after the mod, audio output from the
rear-panel speaker-jack is very low.
I have to cranck up the AF volume pot up
to about 2 o'clock in order to hear anything.

So I'm wondering if this mod really is relevant
for the KIO I'm having?
Or perhaps I have missed something?

Any ideas, anyone?

BR,
Kari
oh2gqc

Don Wilhelm-4

Re: [K3] Low audio output after AF output mod

Kari,

I would hesitate to install a mod that is specified for a Revision XB or
Revision A board on a Revision XD board without specific information
that the mod was also intended for that board.

I would suggest removing the added resistors and ask the folks at
K3support whether the change has been added to the Revision XD board.

73,
Don W3FPR

Kari Sillanmaki wrote:

> Hello group,
>
> Instructions for the AF output mod specify that:
> "This modification is needed for all K3s shipped approximately
> before 01/12/09 containing either
> a Revision "XB" or Revision "A" KIO3 board."
>
> I have a K3 #310 with KIO3A board Revision XD.
> The exact markings on the KIO main board read:
> KIO3A MAIN
> Rev XD
> (c) 2007
> ELECRAFT
>
> The board did not have the 470R resistors installed,
> so I installed them according to the instructions on
> the Elecraft webpage.
>
> Now after the mod, audio output from the
> rear-panel speaker-jack is very low.
> I have to cranck up the AF volume pot up
> to about 2 o'clock in order to hear anything.
>
> So I'm wondering if this mod really is relevant
> for the KIO I'm having?
> Or perhaps I have missed something?
>
> Any ideas, anyone?
>
>
>

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Guy, K2AV

Re: [K3] Low audio output after AF output mod

In reply to this post by Kari Sillanmaki

Kari,

The usual interpretation for the instructions you quoted has an
implied ONLY. Do the mod for XB or A -ONLY- , nothing else.
Circuits in later boards may contain the 470 or simply have different
circuits.

73, Guy.

On Mon, Jun 28, 2010 at 4:17 PM, Kari Sillanmaki <[hidden email]> wrote:

>
> Hello group,
>
> Instructions for the AF output mod specify that:
> "This modification is needed for all K3s shipped approximately
> before 01/12/09 containing either
> a Revision "XB" or Revision "A" KIO3 board."
>
> I have a K3 #310 with KIO3A board Revision XD.
> The exact markings on the KIO main board read:
> KIO3A MAIN
> Rev XD
> (c) 2007
> ELECRAFT
>
> The board did not have the 470R resistors installed,
> so I installed them according to the instructions on
> the Elecraft webpage.
>
> Now after the mod, audio output from the
> rear-panel speaker-jack is very low.
> I have to cranck up the AF volume pot up
> to about 2 o'clock in order to hear anything.
>
> So I'm wondering if this mod really is relevant
> for the KIO I'm having?
> Or perhaps I have missed something?
>
> Any ideas, anyone?
>
> BR,
> Kari
> oh2gqc
>
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-Low-audio-output-after-AF-output-mod-tp5232431p5232431.html
> Sent from the [K3] mailing list archive at Nabble.com.
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