Hi Alberto ,
any idea how to perform a real laboratory test on it ?
I fully agree with you on the analisys ,but I am not used to rely on
opinins instead of measurements .
73-Claudi I1RFQ
--- In [email protected], "i2phd" <[EMAIL PROTECTED]> wrote:
>
> --- In [email protected], "rhblumeng" <rblum@> wrote:
> >
> > "I can say conclusively that a weak SSB and CW signals are
generally
> > more readable/more comfortably readable listening through the
digital
> > filters of the SoftRock/Rocky or KGKSDR/Delta 44 than through the
> > crystal filtering of the FT1000 when there is QRN/static crashes
> > present. As the FT1000 receiver is widely regarded as one of the
> > best lowband weak signal receivers, owing to its excellent cross
mod
> > performance and filtering, this says a lot for how far digital
> > filtering and processing has come."
> >
> > I wonder if anyone has an opinion as to how much of the better
> > performance is due to the digital filtering and how much might
> > actually be the different detection offered by IQ and the
software?
> >
> > Bob
>
>
> Bob,
>
> in the case of the 1000D that's quite a possibility, referred to
> the demodulation done by via software instead of a conventional
> product detector. In the case of the Mark-V, you have both the
> possibilites. You can continue to use the standard product detector,
> or use the EDSP (as Yaesu calls it) that performs the demodulation
and
> filtering in software.
>
> I own a Mark-V and have compared many times this rig to a prototype
of
> the new SDR-X that will be shortly marketed by WoodBox Radio.
> Irrespective of what demodulator I have set in the Mk-V, I find the
> SDR-X, how to say, a bit more clear and limpid. But IMHO this is
> caused by the fact that in the SDR-X there are no crystal filters
with
> their non-constant group delay and non-linear phase response.
> The real advantage of a direct conversion software defined radio is
> just that, the lack of the distortion induced by the use of crystal
> and/or mechanic filters.
>
> 73 Alberto I2PHD
>
