Re: [Discuss-gnuradio] sweep generator

[Dan]

Thank you for this approach as it is back to my original starting point using 
the VCO block.

Yet

What I do not understand is; why the VCO is needed if you are controlling the 
center frequency of the Tx channel
with a scaled sawtooth as a variable controlling center frequency.  Vs, the 
output of a numerically controlled frequency source(VCO) that provides the 
center frequency already ramped by the sawtooth that controls center frequency 
input of the tx channel.



Am I over thinking this?

seems like I am also redundant in my description 







> On Apr 28, 2016, at 3:46 PM, Chris Kuethe <address@hidden> wrote:
> 
> You can do this with gnuradio-companion blocks.
> 
> Use a signal source block to generate a sawtooth wave, feed it into an
> VCO block and dump its output into a probe signal (maybe call it
> "ramp_out"). Then use a function probe (maybe call it "tuner_freq")
> block to monitor the value of the probe signal, and use that as the
> the center frequency for your rf sinks...  You might want to play
> around with add const, multiply const, and throttle to generate new
> tuning steps at an appropriate rate.
> 
> On Thu, Apr 28, 2016 at 3:34 PM, Richard Bell <address@hidden> wrote:
>> Do you specifically not want to use uhd_siggen_gui when you say you want to
>> use companion?
>> 
>> If you were not aware of uhd_siggen_gui, type that into a command line and
>> test it out. It can generate a sweeping tone if that's all you need.
>> 
>> Rich
>> 
>> On Thu, Apr 28, 2016 at 3:16 PM, Dan McKenna <address@hidden> wrote:
>>> 
>>> Hi There,
>>> 
>>> I am using a B210 to record band widths from 1 to 20 MHZ, center
>>> frequencies from 400Mhz to 2 Ghz.
>>> To test my post detection software I would like to use a Tx channel to
>>> make a sweep generator as a real time test source
>>> at sweep rates of around 50 Mhz/second over 1 to 20 mhz range with a
>>> center frequency of 400 Mhz to 2Ghz.
>>> 
>>> To be clear I wish to use companion to generate a frequency sweep at a
>>> rate, defined by start/stop frequency and sweep time
>>> or frequency, range, rate..... for example Freq 400 Mhz, range 2 mhz, rate
>>> 50Mhz/second.
>>> 
>>> Is this possible with the standard gnu radio companion block set?
>>> 
>>> Thanks
>>> 
>>> Dan
>>> 
>>> 
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> address@hidden
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
>> 
>> 
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> 
> 
> 
> -- 
> GDB has a 'break' feature; why doesn't it have 'fix' too?