47395Re: Advice needed with Ensemble RXTX
- Sep 1, 2010Hi Joe,
It does seem that USB sound device does have a hardware error with the left and right channels being swapped, now seen similar comments from 3 different sources.
That makes life fun trying to provide advice!
The simplest way to determine if the I/Q signals are the right way around is just to go to a band and tune a couple of SSB signals and ensure they appear as the correct upper or lower sideband as expected. I say tune to several signals as I once managed to tune to the one and only signal on the band where the person was actually using the opposite sideband to convention :)
73, Bob G8VOI
--- In firstname.lastname@example.org, Joseph Teichman <jteich3@...> wrote:
> I also am just getting started with a Ensemble RXTX and I had
> similar experiences.
> I built mine with the I/Q jumpers crossed, as suggested in the build
> instructions (actually, I put in posts and wire-wrapped them so that it
> would be easy to swap should it be necessary). This was supposed to be
> necessary for using PSDR. However, I found that I had to switch the I/Q
> lines to the straight configuration in order for it to work with PSDR.
> BTW, I am using a Creative XFi 5.1 USB soundcard.
> In order to make swapping I/Q lines easy (even easier than the wire-wrapping
> suggestion), I purchased a stero mini to Female RCA cable and a stereo mini
> to male RCA and connected them together. This way, I could swap the left and
> right channels in a moment.
> Also, I found that in PSDR, I had to drop the "Line In Gain" (I turned it
> down to '1' - I think that 0 gave me some kind of problem at the time) in
> the Audio/Primary configuration window to have image rejection.
> One thing that I am confused about with PSDR is how to set up transmit. The
> Audio/Primary window seems to be used for setting up receive, where you
> specify the the input as the soundcard that gets the receive I/Q and the
> output line to where the audible output is sent to. Do you set it up
> transmit in the VAC window? Do I then have to check the Direct I/Q/Output to
> VAC box?
> On Wed, Sep 1, 2010 at 10:47 PM, Yannick <yannick.devos@...> wrote:
> > Hi Alan,
> > > Both have auto image rejection for RX. Bob, G8VOI recently posted
> > > instructions for 1.12 he knows the software better than I do.
> > With I/Q signals the right way image rejection is ok now, I just told about
> > that as a reminder to understand my problem.
> > What I also wanted to emphasis is "don't always trust your sound card".
> > Mine as left/right channels reverted.
> > > I do not know, maybe you have made a bad adjustment.
> > > Was it always like that? You can revert to default by deleting the data
> > > file.
> > > "You have to find and delete the database.xml settings file which it does
> > > not reside in the installation folder. The database.xml file resides for
> > XP
> > > in C:\Documents and Settings\<user name>\Application Data\FlexRadio
> > > Systems\PowerSDR v1.19.3 and for Vista in C:\Users\<user
> > > name>\AppData\Roaming\FlexRadio Systems\PowerSDR v1.19.3" Christos
> > Earlier
> > > versions of PSDR put the database file in the Program folder, Genesis
> > > database.xml, others use a different format PowerSDR.mdb.
> > > It is possible to save and select these files to use different
> > > configurations, or restore operation if it gets corrupted.
> > >
> > > PDSR has always worked for me with all the gain settings as default and
> > with
> > > the record settings high. I even have to increase the waterfall
> > sensitivity.
> > > The manual gives instructions how to setup correctly.
> > I will try this. Having the I/Q signals the wrong way must have brought a
> > lot of incoherent data to the database.
> > Thanks for your help.
> > 73,
> > Yan.
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