Posted by
Edward R Cole on
May 30, 2019; 9:09am
URL: http://elecraft.85.s1.nabble.com/3-technical-questions-tp7652460p7652486.html
Wayne, etal:
I am doing a similar thing with my K3 to view as panadapter. I use
the LP-Pan on 8.215 IF output of my K3 and that goes to the A/D in my
Delta44 soundcard to provide a digital stream to sw in my
computer. The 1st IF of the K3 is ahead of the roofing filters so
fairly wideband. The LP-Pan is in fact a SDR which outputs IQ
baseband to the soundcard. So with the K3 it is a single-conversion SDR.
LP-Pan passes nearly 400-KHz of RF bandwidth which wider than most
soundcards. The Delta44 is 96-KHz wide soundcard.
Using a special eme sw all signals inside approx 90-KHz wide band are
simultaneously decoded and displayed showing virtually all the
calling stations. You could also say it displays as a 90-KHz panadapter.
This sw has the ability to take two IQ streams so one can use the 1st
IF of the subRx in the K3 simultaneously.
With two antennas orthogonally polarized (Hpol and Vpol) the sw can
actually solve for the real polarization angle and maximize the signal.
So how does this relate to the K4? I'm guessing the A/D processing
the panadpater display might also provide digital IQ output to a
computer which could perform similar wideband decoding of digital
signals. I guess the question would be if the IQ stream is available
for export.
73, Ed - KL7UW
From: Wayne Burdick <
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To: Bill Frantz <
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Cc: Elecraft Reflector <
[hidden email]>
Subject: Re: [Elecraft] 3 technical questions
Message-ID: <
[hidden email]>
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The K4 is always doing direct sampling for panadapter purposes.
If the HDR module is turned off or is not present, the K4 also does
direct sampling for demodulation.
If the HDR module is turned on, two additional ADCs are used, right
at the outputs of the crystal filters (oversimplifying a bit). The
original two ADCs are still being used for the panadapter.
Wayne
N6KR
73, Ed - KL7UW
http://www.kl7uw.comDubus-NA Business mail:
[hidden email]
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