LP-Bridge will handle the serial port issue.  I run the K3, Spectravue, DXBase 
and N1MM with one USB to Serial adapter and ports to spare.


--- On Tue, 6/25/13, Joe Subich, W4TV <li...@subich.com> wrote:

> From: Joe Subich, W4TV <li...@subich.com>
> Subject: Re: [Elecraft] K3 & SDR/IQ
> To: elecraft@mailman.qth.net
> Date: Tuesday, June 25, 2013, 8:09 PM
> 
>  > So how do yu set it up to watch lower end of 6m on the
> K3, without
>  > using a transverter?
> 
> Connect SDR-IQ to the IF Out jack (not the RX Ant) and tune
> SpectraVue
> to 8.125 MHz manually *or* in SV's "ExtRadio Setup" Select
> the K3 and 
> uncheck "HF Tracking Mode."
> 
> Note: If you want to use the frequency tracking tied to the
> IF, you
> will need some kind of serial splitter to share the K3
> serial port.
> For more information see the SpectraVue Help file section
> 4.2, page
> 59 and page 58 "IF Tracking".
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 6/25/2013 9:55 PM, KD7YZ Bob wrote:
> > Howdy K3' people:
> >
> > I have an SDR/IQ. I also have three Elecraft
> transverters. When I
> > connect a BNC to the BNC-RX "T" chain, and I tune
> Spectravue to 28.07
> > and the 6m xv50 transverter is "on", I am looking at
> the area around
> > 50.070 .. I can look for beacons and Sporadic-E
> openings.
> >
> > Nothing new.
> >
> > However, the other day,  I suspected the xv50
> transverter to on the
> > Fritz. So I switched to the internal 6m Rx/Tx section.
> Made some
> > contacts.
> >
> > So now I want to once again look for 6m Beacons down
> below 50.080  .
> > My only option seems to be the IF BNC output.
> >
> > I connected there and tried to set Spectravue for
> 8.215; 10.0; 28.0 and
> > still see nothing from 6m. I even tried to set it at
> 50.10, to no avail.
> >
> > So how do yu set it up to watch lower end of 6m on the
> K3, without
> > using a transverter?
> >
> > thanks
> >
> >
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