I found the problem; the connector is defect; after replacing the
connector the system is doing the demodulation for only the I or Q
signal.
Only using the RF source to see the one or two peaks... iam seeing 2
peaks.
I did measure the amplitude of the dds signal this seems oke.
Also the phase seems oke, at least on the scoop. what is the best
approach of measuring the phase error?
In softrock there is a IQ balancing measure option this doesnot show
any information.
Is there someone who can throw some light?
Johan PA3GSB
--- In [email protected], "johanmaas2001"
<[EMAIL PROTECTED]> wrote:
>
> Alberto,
>
> Tnx for your reply.
>
> It seems that i have a problem. Only I or Q is working...
>
> I connect a HF source to the input and mesured after the switch;
> here i see for I and Q the same signal (voltage).... so it seems
one
> of the amplifiers which fails.
>
> Hope to report succes in the near future
>
> 73 Johan PA3GSB
>
>
> --- In [email protected], "i2phd" <i2phd@> wrote:
> >
> > --- In [email protected], "johanmaas2001"
<johanmaas2001@>
> > wrote:
> > >
> > > Hello all,
> > >
> > > I have build a sdr(rx and tx) beased on the sdr1000. (On
> 80meters i
> > > made different QSO's; i did build only the BPF for 80meters...
> the
> > > other bands will follow)
> > >
> > > Is there a program which can check the I an Q signal which are
> > > going to the the soundcard; checking the phase and the
amplitude?
> > >
> > > When using the rx mode i disconnect for example one of the
> > > signals(I) without any problem; the demodulation of the signal
is
> > > still oke but disconnecting the other signal (Q) the signal is
> > > gone.
> > > Is it possible to see in SDRadio is the radio is using the I
And
> Q
> > > or only one of the signals?
> > >
> > > 73 Johan PA3GSB
> > >
> > Johan,
> >
> > the simplest of the tests is to connect your Rx to a signal
> > generator set for a frequency offset by e.g. 5 or 10 kHz from
the
> band
> > center. If your Rx provides both I and Q signals with the correct
> > phase and amplitude balance, you will see (using SDRadio) just
one
> > peak offset from the band center by those 5 or 10 kHz.
> > If instead you see a double peak, one at minus 5 or 10 kHz and
the
> > other at plus 5 or 10 kHz, then just one of the two signals is
> > actually sent to the software, or they are badly wrong as phase
and
> > amplitude are concerned.
> >
> > 73 Alberto I2PHD
> >
>
SPONSORED LINKS
| Ham radio | Craft hobby | Hobby and craft supply |
YAHOO! GROUPS LINKS
- Visit your group "soft_radio" on the web.
- To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
- Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
