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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