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

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Xlate FIR filter broken in gr 3.7
Date: Wed, 07 Aug 2013 14:18:28 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130623 Thunderbird/17.0.7

Hi Anton,
it is really hard to capture apco25 signals in Germany.
Could you really open a ticket, attach a few captured samples saved using a file sink,
and the 3.6 and 3.7 flowgraphs; or provide some kind of test case with GNU Radio Signal sources
that simulate a signal. Be sure to attach screenshots of your waterfall plots.
It is really hard to guess what goes  wrong otherwise.


Am 07.08.2013 13:56, schrieb Anton Komarov:
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.

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.


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

KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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