[Elecraft] 3 technical questions

[Edward R Cole]

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 <n6kr at elecraft.com>
To: Bill Frantz <frantz at pwpconsult.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] 3 technical questions
Message-ID: <E2C2F138-524B-4B2D-9AF3-8A3CE4F988B4 at elecraft.com>
Content-Type: text/plain; charset=us-ascii

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.com
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