Maybe have the DDS offset take decimal increments? Dudley
73, Dudley WA5QPZ FlexRadio Systems (512) 250-8595, Option 2 Email: [email protected] <[email protected]> Web: www.flexradio.com <http://www.flex-radio.com> "Tune in excitement!" ™ On Tue, Nov 16, 2010 at 10:22 AM, Ted <[email protected]> wrote: > > > Until the enhancement is coded can we use a low tech stop watch to time the > rotation of the phase display and average the time over many rotations? > i.e. > does the phase rotation of the bin correlate closely to the rotation of the > phase display? > > > Ted > NX6C > > > > ________________________________ > From: Tim Ellison <[email protected]> > To: Bob McGwier <[email protected]>; Flex Edge <[email protected]> > Sent: Tue, November 16, 2010 4:47:18 AM > Subject: Re: [FlexEdge] FMT next time > > Sounds like an enhancement for the Frequency calibration routine in > PowerSDR > <wink>. > > > -Tim > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] > On Behalf Of Bob McGwier > Sent: Tuesday, November 16, 2010 6:47 AM > To: Flex Edge > Subject: [FlexEdge] FMT next time > > > 1) I want to listen to WWV with a larger FFT than we currently listen to in > the > the code. > 2) I want to listen to contiguous blocks of these FFT results. > > The phase spin of the WWV carrier is DIRECTLY usable to compute the > frequency > offset (up to ionospheric disturbance) and should lead to mHz accuracy. > > Using this computed estimate of the oscillator inaccuracy in the receiver > we can > then apply the same process in an FMT with the calibrated receiver. > > If you have a carrier and apply successive FFT blocks to it, the phase > rotation > of the bin containing the FMT carrier gives the frequency offset from the > center > of the block and can be made more accurate by filtering the resulting > offsets to > get a more noise free version. > > Bob > N4HY > -- > (Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio > Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. > "Be yourself, because the people who mind don't matter. And the people that > matter don't mind." > -Dr. Seuss > Active: Facebook,Twitter,LinkedIn > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for > posting topics related to SDR software development and experimentalist who > are > using beta versions of the software. > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for > posting topics related to SDR software development and experimentalist who > are > using beta versions of the software. > > > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software development and experimentalist > who are using beta versions of the software. > _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
