Floyd Sense <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I recently acquired a pulse generator and will be doing some testing
comparing the TR7 noise blanker to that in the Icom 765 and 781. If
someone would like to send me their new K3 this summer, I'd be glad to
check it out against the TR7 blanker. Of course, I'd need the K3 for a
long time! Haven't had a chance to test the TR7 yet, but the blanker in
the 765 is truly amazing.
73, Floyd - K8AC
Thom LaCosta wrote:
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
www.baltimorehon.com/ Home of the Baltimore Lexicon
www.tlchost.net/hosting/ Web Hosting as low as 3.49/month
---------- 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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