开云体育

On Thursday, October 3, 2019, 4:20:50 AM CDT, Rune Broberg <mihtjel@...> wrote:

Hi Norbert,
the application can run calibrations at far more than 401 points - I have
certainly done 5050 points at one point. ;-) But it does this in the
application, and not on the device, due to the hardware limitations.

I agree that a function to find cut-off frequencies for filters etc. would
be interesting, and I've put it on the list of features I would like to
implement for the next version, ie. for next week. I don't make any
promises though :-)

What measurements would be relevant to provide? Cut-off frequency, span for
band-pass, dB/octave and dB/decade fall-off, pass-band ripple?

--
Rune / 5Q5R

On Thu, 3 Oct 2019 at 11:12, <norbert.kohns@...> wrote:

Hi Rune,
thank you for fixing this issue!
I have a question for you in respect to the required number of data points
to measure a band pass filter. With 101 points it is most likely not
possible to find the -3 dB points because the sample point is way off from
-3 dB on both sides of the band pass. With 401 points it would work. An
automatic feature of measuring the bandwidth would be absolutely cool! The
TAPR software is able to perform a calibration at 401 points or even more
than that, so I am certain that you could do that as well.? I have no glue
on how difficult that would be, but more data points for calibration would
be a huge improvement.

Kind regards
Norbert, DG1KPN