K3 RF Feedback Recommendation

[Phil Salas]

I'm getting ready to upgrade my K3 with the audio mod and the ALC mod.  I've
found the front panel L4 mod also for the RF feedback problem, so I'll go
ahead and do that at the same time.  Is the KIO3 L7 mod an official K3 mod
(also for RF feedback)?  I haven't found anything about this on the website.
Is this recommended?

Phil - AD5X

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[KK7P]

> ...Is the KIO3 L7 mod an official K3 mod (also for RF feedback)?

Directions are being written up for posting soon.  Yes, if you are
already doing these mods on your K3, the L7 bypass on the audio
daughterboard is "approved."

73,

Lyle KK7P
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[Don Wilhelm-4]

Phil,

I don't know if it is 'official' or not, but I would highly recommend
you jumper KIO3 L7.  An RF Choke in the signal return path is just
asking for the return lead to respond to many forms of noise (including
RF) and couple it into the circuit.

73,
Don W3FPR

Phil & Debbie Salas wrote:
> I'm getting ready to upgrade my K3 with the audio mod and the ALC
> mod.  I've found the front panel L4 mod also for the RF feedback
> problem, so I'll go ahead and do that at the same time.  Is the KIO3
> L7 mod an official K3 mod (also for RF feedback)?  I haven't found
> anything about this on the website. Is this recommended?
>
> Phil - AD5X
>
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[Dave Hachadorian]

----- Original Message -----
From: "Phil & Debbie Salas" <[hidden email]>
To: <[hidden email]>
Sent: Friday, December 12, 2008 5:54 PM
Subject: [Elecraft] K3 RF Feedback Recommendation


> I'm getting ready to upgrade my K3 with the audio mod and
> the ALC mod.  I've found the front panel L4 mod also for
> the RF feedback problem, so I'll go ahead and do that at
> the same time.  Is the KIO3 L7 mod an official K3 mod
> (also for RF feedback)?  I haven't found anything about
> this on the website. Is this recommended?
----------------------------
Well, we have this message to go by:

> Is remove of L4 on the front panel board and L7 on the
> KIO3 audio board
> "official" Elecraft modifications?

Bypassing these two inductors will not impact your warranty.
73,
Lyle KK7P
-----------------------------------

By the way, I found an easy way to do the L4 deal. If you
remove the left side panel of the K3, you can reach in and
ground pin 7 of the mic socket to a little terminal on the
board marked "gnd" with a piece of wire, and save the
trouble of removing the front panel board.


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