Re: [Discuss-gnuradio] Xlate FIR filter broken in gr 3.7

[Tom Rondeau]

On Wed, Aug 7, 2013 at 7:56 AM, Anton Komarov <address@hidden> wrote:
> Ok, i've attached very simple grc chart
> with slider you can change the frequency, two waterfalls shows spectrums
> before and after xlating.
> So i had test it in apco25 env and took apco signals as a reference. So when
> i saw signal e.g. at 451.378 MHz and tuned to it i saw no signal after
> xlating nevertheless it was the same time on waterfall before xlating.
>
> You can test this chart with you radio environment.
>
> Then i testing the same logic with gr 3.6 (code is not compatible i have to
> redraw it..) and here it is! xlating worked like a charm.

Try reversing the sign of the center frequency value for the xlating
filter. I've been using this block for some tests of my own this week
and it's working as expected.

Tom



> On Wed, Aug 7, 2013 at 1:48 PM, Martin Braun (CEL) <address@hidden>
> wrote:
>>
>> On Wed, Aug 07, 2013 at 01:00:32PM +0400, Anton Komarov wrote:
>> > Hi, made an attempt to test my python scripts with new 3.7.0 of GR
>> >
>> > and what i am seeing xlate fir filter is broken
>> >
>> >
>> > previously xlate worked perfect with 3.6 version
>> >
>> >
>> > tested with waterfalls and i see wrong xlating
>> >
>> > i think developers should pay attention to this issue
>>
>> Hi Anton,
>>
>> can you please elaborate on this bug. Ideally, could you post an issue
>> on our tracker: http://gnuradio.org/redmine/projects/gnuradio/issues
>>
>> Specify what you configured, what the expected outcome was and what
>> happened instead.
>>
>> Thanks,
>> MB
>>
>> --
>> Karlsruhe Institute of Technology (KIT)
>> Communications Engineering Lab (CEL)
>>
>> Dipl.-Ing. Martin Braun
>> Research Associate
>>
>> Kaiserstraße 12
>> Building 05.01
>> 76131 Karlsruhe
>>
>> Phone: +49 721 608-43790
>> Fax: +49 721 608-46071
>> www.cel.kit.edu
>>
>> KIT -- University of the State of Baden-Württemberg and
>> National Laboratory of the Helmholtz Association
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>



-- 
Tom
Visit us at GRCon13 Oct. 1 - 4
http://www.trondeau.com/grcon13