Thom LaCosta <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Response to K3 questions from Elecraft
If you do email Wayne directly with questions that compare the K3 to any of the
drake series, please share the answers here.
Thom
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---------- Forwarded message ----------
Date: Tue, 1 May 2007 07:54:59 -0700
From: wayne burdick <[EMAIL PROTECTED]>
To: Thom LaCosta <[EMAIL PROTECTED]>
Cc: Elecraft Reflector <[EMAIL PROTECTED]>,
Lyle Johnson <[EMAIL PROTECTED]>
Subject: Re: More Questions: K3
Thom,
I'm sorry I missed this one. We've been overwhelmed by email the past few days.
Lyle and I have been tag-teaming, covering most of the bases, we hope!
On another list, some users who have both Drake equipment and K2's have been
discussing the relative merits of the Drake NoiseBlankers versus the K2 NB.
The K3 noise blanker is a completely new design. It is being tested on a wide
variety of noise sources. While it's impossible to say exactly how it would
compare to other blankers on every noise type, I can assure you it's a
significant enhancement. We studied several different design approaches before
starting the KNB3, including the Drake circuit.
In addition, the K3 includes DSP-based both noise blanking and noise reduction
features that can mitigate noise problems I.F. blankers can't touch, no matter
how sophisticated.
There have also been discussions relative to passband tuning.
The K3 includes passband tuning. It's designed to take maximum advantage of its
large number of crystal roofing filters and I.F. DSP, in combination. There are
two sets of controls: SHIFT/WIDTH, and HICUT/LOCUT. Tapping a single button
switches between the two. An optimized DSP graphic on the LCD sits just above
the knobs, and shows you at a glance whether the passband has been shifted or
narrowed as a result of using these controls.
The most appropriate roofing filter is selected automatically as these controls
are rotated. If you have one of our [pending] variable-passband crystal roofing
filters installed, then the 1st I.F. bandwidth (crystal filter) will closely
track the 2nd I.F. bandwidth (DSP). This is far superior to receivers that have
only wide roofing filters and try to do the whole job at the DSP, as well as
receivers that simply shift one filter against another at two different IFs.
Feel free to email me directly with further questions on this topic.
73,
Wayne
N6KR
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