[Elecraft] K3 KAT3 High SWR Issue Solved

[Mark Musick]

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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