[Elecraft] SDR-IF and I/Q questions

[Don Wilhelm]

Ed,

The I/Q outputs are baseband audio - just as would be the case with the 
output of LP-Pan, or a Sofrrock receiver, or most any SDR receiver.  The 
serial (or USB) port is only used when rig control is introduced in 
addition to the panadapter function.

73,
Don W3FPR

On 11/9/2011 12:31 PM, Edward R. Cole wrote:
> Responding the message repeated, below.
>
> Planning on a KX3 and user of SDR sw I am interested in this topic,
> though I have no experience with SDR-IF, PSDR-IF, or HDSDR.  I have a
> SDR-IQ which interfaces using USB-2.0 and mainly run Spectravue with
> it (though I have run Linrad).  Also the K3+LPPan+emu0202 which uses
> USB-2.0, also.  These can also utilize software that support
> soundcard input (with proper drivers).
>
> My impression was that the KX3 IQ output was analog baseband and not
> converted to USB. (?).
>
> 73, Ed - KL7UW
>
> Message: 16
> Date: Tue, 8 Nov 2011 14:36:53 -0600
> From: "Richard Fjeld"<rpfjeld at embarqmail.com>
> Subject: [Elecraft] SDR-IF and I/Q questions
> To: "elecraft posting"<elecraft at mailman.qth.net>
> Message-ID:<A1A1511B47FF46F7A35DA9C84AFA1D5E at BIOSTAR>
> Content-Type: text/plain;       charset="Windows-1252"
>
> This is the new subject title, and needs some background, so it will
> be lengthy this time.
>
> Some of us use SDR-IF, and the new KX3 will use SDR-I/Q methods for
> connecting to a computer  running SDR software and seeing the results
> on a monitor. (The SDR-IF users must provide a SDR-IF receiver to
> bring out the I/Q leads. It is to be assumed that the SDR-IF receiver
> is functioning correctly.)  With both types,  I/Q leads are brought
> to a computer. (If you are wondering, I am on the list for a KX3)
>
> So the computer AND THE SOFTWARE are the center of attraction here.
> This is where great things may happen. (Emphasis on 'may')
>
> Some of us are at different experience levels, but I think we all
> would have, and still would, appreciate help to reach
> satisfaction.  The reflector is the place for this. The real question
> is; Should this be on a dedicated thread?  When I read the KX3 was
> going to be SDR capable, I wondered if Elecraft realized what it was
> getting into for the reflector?
>
> IMHO, The weak link in this SDR thing is the computer and software.
> PSDR-IF has great control features, but when I compare it to HDSDR,
> the latter does a great job of displaying the signals and is very
> sensitive. PSDR-IF looks at both directions in spectrum, so far, I
> can only get HDSDR to look upward in spectrum.
>
> We can't get rid of the mirrored images in PSDR-IF.  ('WE' includes a
> friend who still owns 3 of 6 Flex radios he has owned, and 2 of 4
> SDR-IF receivers. He is no beginner to SDR.)
>
> My thanks to all who responded. Can't take the space to recap
> everything, but Sebastian suggested mirrored images are due to ground
> loops. It has been long enough that I can't remember if I checked
> that, and I will.  However, why just PSDR-IF and not HDSDR that is
> affected?  A ground loop should affect both. Still, it is worth checking out.
>
> Basically, I'm disappointed with the software. I don't mind
> installing and setting some options for my type of equipment, but
> from there-on I expect it to function conveniently and nearly as well as a P3.
>
> The question for today is; have any Elecraft users achieved that goal
> with a computerized pan-adapter? And if so, with what software?  And
> if so, do you use a USB to Serial, or straight Serial?
>
>
> Thanks, from now on it will be shorter.
>
> Richard Fjeld, n0ce
> rpfjeld at embarqmail.com
> I'd rather be learning.
>
>
>
>
>
>
>
> 73, Ed - KL7UW, WD2XSH/45
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