Hi George,
This is a precision matched phase I-Q filter. Its a key component of the KX3s
excellent performance. No different than if you were ordering a precision
crystal as we use in the K3.
These parts are matched and selected here. We can supply matched sets if they
ever are needed. We have yet to see one fail. (The chance of failure of these
caps is miniscule.)
73,
Eric
elecraft.com
On 4/11/2014 9:26 AM, george fritkin wrote:
Matching 0.1% capacitors? What kind of a design is this that requires such
tolerances ? This make maintenance almost impossible.
George, W6GF
On Thursday, April 10, 2014 9:31 PM, Wayne Burdick <n...@elecraft.com> wrote:
Hi Phil,
The roofing filter module (KXFL3) is expensive for us to manufacture because of
the extremely tight tolerances on the capacitors (0.1% in some cases). They
have to be matched by hand.
We didn't want to pass this cost on to all KX3 users, since many of them don't
require the roofing filters. Even without them, the KX3's receiver performance
would fall into the top 6 or so radios as measured by Sherwood Engineering
(http://www.sherweng.com/table.html).
73,
Wayne
N6KR
On Apr 10, 2014, at 7:56 AM, Phil Hystad <phys...@mac.com> wrote:
I have a curiosity question. Why is the KXFL3 roofing filter an option on the
KX3? I mean, why is it not a built-in feature of the KX3? First, I already
own a KX3 with the KXFL3 filter so I am not asking this in order to choose to
buy or not. Caveat: I am also a neophyte (philistine, ignorant, or
troglodyte) in this sort of radio technology and still in learner mode.
But, it seems to me that the KXFL3 roofing filter is almost required with a
radio as nice as the KX3. Without it, as I understand the function, any
crowded band interval like a pileup or close-in CW signals and such would
render a KX3 (without the roofing filter) with less than the usual Elecraft
stellar RX performance.
My guess, and this is only a wild guess, is that maybe the option leads this
space open to future improved roofing filters? Or, maybe even leave it open to
a 3rd party market supplied filter (although, I think this filter is
particularly different from other typical 3rd party filters).
73, phil, K7PEH
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