[Elecraft] K3 KAT3 High SWR Issue Solved

[Don Wilhelm]

Mark,

I am not certain when they stopped installing the trap in the KAT3, but 
I know it is not in the KAT3A.

If you pull your KAT3 out for any reason, eliminate the trap.

73,
Don W3FPR

On 1/23/2019 2:07 PM, Mark Musick wrote:
> Don,
> Is the trap in all KAT3s up through those installed in K3s with 9000 or just the early K3s below some serial number?
>
> Mark, WB9CIF
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Don Wilhelm
> Sent: Wednesday, January 23, 2019 18:48
> To: K9MA <k9ma at sdellington.us>; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 KAT3 High SWR Issue Solved
>
> Scott,
>
> It was added to the initial K3s, but later found not to be necessary, and if the trap broke down, it would cause trouble.  So the KAR3A does not have it.
>
> 73,
> Don W3FPR
>
> On 1/23/2019 10:49 AM, K9MA wrote:
>> On 1/23/2019 09:41, Ed G wrote:
>>> A fair amount of digging in the email archives found a couple posts
>>> which touched on an issue with the 8.215 MHz trap (C10 and L10) on
>>> the
>>> KAT3 tuner board.
>> Although my older K3 doesn't seem to have a problem, I wonder why that
>> trap was not required in the KAT3A. It was there, presumably to
>> improve IF rejection, so I'd expect removing it without some other
>> change to the
>> K3 would be unwise.
>>
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