Hi Markus, yeah, that sounds right, but: You'd probably want to use a PLL frequency detector (similarly parameterized) to detect these and output a frequency estimate, and then do some math on that estimate, and use it to correct the system.
Best regards, Marcus On Mon, 2019-10-28 at 16:41 +0100, Markus Heller wrote: > Dear OMs, > > I guess this carrier tracking block would be useful to handle > frequency > drift of cheap (unstabilized) devices, when working QO-100 satellite > connections. This block could be used to find the band end beacons > and > derive the frequency shift and correct it accordingly. Right? > > vy73 > markus > dl8rds > > Am Montag, den 28.10.2019, 09:44 -0500 schrieb Bill Dailey: > > Can you give a little primer on using that PLL tracking? I would > > love to use that to just track carriers random frequencies. For > > instance 10mhz. Ultimately I want to track and periodically log > > and > > offset from true predicted frequency. Like every 10 seconds. > > > > Bill Dailey > > > > Negativity always wins the short game. But positivity wins the long > > game. - Gary Vaynerchuk > > > > Don’t be easy to understand, > > Be impossible to misunderstand > > - Steve Sims > > > > > On Oct 28, 2019, at 9:27 AM, Barry Duggan <[email protected]> > > > wrote: > > > > > > Hi Albin and Volker, > > > > > > I added a PLL Carrier Tracking block to take care of the tuning > > > problem. See the revised > > > https://wiki.gnuradio.org/index.php/File:FunCube_AM.png > > > > > > Albin, that 'spike' is the carrier! This is AM ;) > > > > > > Thank you both for your suggestions. > > > --- > > > Barry Duggan KV4FV > > > > > > > > > On 2019-10-27 07:13, Albin Stigö wrote: > > > > Hi Barry, > > > > Some thoughts: > > > > You have a large DC spike at the center, try using the > > > > frequency > > > > xlating > > > > fir filter to tune an offset frequency. > > > > Why don't you decimate at the channel filter? > > > > Try observing the signal at various points using the frequency > > > > sink. > > > > Good luck, > > > > Albin SM6WJM > > > > On Sat, Oct 26, 2019, 21:02 Barry Duggan <[email protected]> > > > > wrote: > > > > > Hi, > > > > > I've been working on a gnuradio AM broadcast receiver, and > > > > > have > > > > > found > > > > > that the tuning is very critical to obtaining clear audio. My > > > > > flowgraph > > > > > can be seen at > > > > > https://wiki.gnuradio.org/index.php/File:FunCube_AM.png. > > > > > Are there any alternate demodulation methods which are not so > > > > > sensitive > > > > > to exact tuning? > > > > > Thanks, > > > > > -- > > > > > Barry Duggan KV4FV > >
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