If you don't mind me asking, why do you need a complex input? The job
of the frequency modulator is to transform a real domain signal into
complex domain. The usual case is you have baseband audio represented
as floats as an input.
On 1/31/18, Steve wrote:
> Thanks for the comment Adrian,
>
> Hmm
The QPSK baseband signal is composed of real (I) and imaginary (Q)
components, or complex values. Using a Quadrature modulator, you can
combine these onto one sideband. Like the SSB signal of FreeDV, it is
a complex signal. But creating an analog SSB signal is what makes VHF
SSB so expensive. If yo
Having built an I/Q modulator in hardware, I don't suggest that you go from
the digital to the analog domain as I/Q if you can avoid it. It's difficult
to keep the modulator in balance.
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I noticed that the Digital Amateur TV guys used a ADRF6755 chip, and
they seem to have very little problems with IQ, other than expense. It
is driven by a AD9767 DAC and USB. But it looks like that project is
end-of-life.
The replacement is going to be released soon. The
MiniTiuouner-Express. Don'
I don't think ATV folks care all that much about a little carrier leak,
considering that it's supposed to be vestigal sideband anyway. For
narrow-band digital voice it was a real concern.
On Fri, Feb 2, 2018 at 12:06 PM, Steve wrote:
> I noticed that the Digital Amateur TV guys used a ADRF6755 c
