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" <[EMAIL PROTECTED]> 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
>
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