GNU Radio, One Step at a Time
Read the mailing list of the GNU project right here! The information here is regarding the GNU radio project for USRP radios.
Thursday, October 16, 2025
Detection of drones
Thursday, October 9, 2025
Adding Signalhound sink/source oot module to gr core
Hello,
I’m a software engineer for signalhound. We are a big fan of gr over here. We already have a signalhound out of tree module on github for customers of SH to access. I was wondering it it would be possible to get our module added to the gr core and if so what that process would look like?
Thank you,
Nathan Snyder | Software Engineer
Signal Hound, Inc.
1502 SE Commerce Ave, Suite 101
Battle Ground, WA 98604
(360) 787-2144
Thursday, September 25, 2025
Capture the Flag @ Ingeniería deMuestra
The deadline to register is next Thursday, and the CTF begins next Friday!
best
Monday, September 15, 2025
[GR-UHD] Announcing GNURadio 3 binary installers with UHD 4.9
Friday, September 12, 2025
Re: Simple BPSK Constellation?
Ralph,
It's because the Constellation Modulator includes a root-raised cosine filter. If you just want bare constellation points, you can use the Chunks to Symbols block.
Ron
Hi Everyone,
I've been trying to make a simple DBPSK transmitter for a random data (bit) source in GRC. My flowgraph just uses:
Constellation Object
Random Uniform Source > Constellation Modulator > Throttle > QT GUI SinkHowever, in the constellation plot I see clusters around -1,1 and a point at 0,0 instead of the expected tight grouping just around -1,1. I've confirmed the source produces a stream of 0,1 (bytes) so there should be no errand points being mapped to 0 etc. Can someone point me in the right direction?
Thanks,
Ralph
Simple BPSK Constellation?
Hi Everyone,
I've been trying to make a simple DBPSK transmitter for a random data (bit) source in GRC. My flowgraph just uses:
Constellation Object
Random Uniform Source > Constellation Modulator > Throttle > QT GUI Sink
However, in the constellation plot I see clusters around -1,1 and a point at 0,0 instead of the expected tight grouping just around -1,1. I've confirmed the source produces a stream of 0,1 (bytes) so there should be no errand points being mapped to 0 etc. Can someone point me in the right direction?
Thanks,
Ralph
Wednesday, September 10, 2025
Re: binding errors in Ubuntu 24
Federico and all,
I've found a better solution for this issue (a little late, but better than never). If you use the latest version of castxml, the massive error problem is solved. Here's the steps:
1) Download the latest pre-built version of castxml at:
https://github.com/CastXML/CastXMLSuperbuild/releases
For Ubuntu 24.04, I used:
2) Install the tar.gz file into any directory.
3) Set a path to the newly installed castxml binary. For example, I installed into /media/re/nvme/castxml:
export PATH=/media/re/nvme/castxml/bin:$PATH
gr_modtool bind now works good.
Ron
Hi,Thanks (publicly) to Ron for his solution, it worked like a charm. For anyone finding a similar problem, I've used a Docker with a 22.04 Ubuntu (you may use mine at https://github.com/git-artes/docker-gnuradio/, although there are several other out there), migrated the OOT through the required gr_modtool bind, and it also worked perfectly in my "native" 24.04.bestFede
El mié, 29 ene 2025 a las 20:47, Ron Economos (<w6rz@comcast.net>) escribió:
I just tried gr_modtool bind on Ubuntu 24.04, and I'm getting the same
results (huge error dump).
For the last OOT I updated to 3.10, I just went back to Ubuntu 20.04 and
gcc 9.4.0. Then I checked that it builds okay on Ubuntu 24.04.
I've pasted my Ubuntu 24.04 gr_modtool bind error dump onto the end of
this e-mail.
Ron
On 1/29/25 14:44, Federico 'Larroca' La Rocca wrote:
> Hi,
>
> I'm trying to port our gr-isdbt OOT so that it works as
> "out-of-the-box" as possible in Ubuntu 24.04 (it's used in our course,
> so I would like the student's life to be as simple as possible).
>
> I've had some problems regarding binding, so I've decided to add a
> single block into a freshly created OOT, and I get the following error:
> Python bindings for ofdm_synchronization.h are out of sync
> which makes sense since I've changed that file in the include
> directory. However, when running gr_modtool bind ofdm_synchronization
> I get several errors that end with
> fatal error: too many errors emitted, stopping now [-ferror-limit=]
> 20 errors generated.
> Error occurred while running CASTXML xml file does not exist
>
> I've seen that this has been reported
> (https://github.com/gnuradio/gnuradio/issues/6477) and that there's
> even a PR that has been merged into the main code
> (https://github.com/gnuradio/gnuradio/pull/7408).
>
> My question is then: what do you think would be the simplest way to
> avoid this problem?
>
> thanks!
gr_modtool bind alpbbheader_bb
GNU Radio module name identified: atsc3
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:14:
In file included from /usr/include/c++/14/memory:63:
In file included from /usr/include/c++/14/bits/memoryfwd.h:48:
/usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:827:25: error:
invalid suffix 'bf16' on floating constant
827 | typedef __decltype(0.0bf16) __bfloat16_t;
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
1989 | __glibcxx_float_n(32)
| ^
/usr/include/c++/14/limits:1909:16: note: expanded from
macro '__glibcxx_float_n'
1909 | { return __glibcxx_concat3 (__FLT, BITSIZE, _MIN__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:232:1: note: expanded from here
232 | __FLT32_MIN__
| ^
<built-in>:217:64: note: expanded from macro
'__FLT32_MIN__'
217 | #define __FLT32_MIN__ 1.17549435082228750796873653722224568e-38F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1908:7: note: expanded from
macro '__glibcxx_float_n'
1908 | min()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
/usr/include/c++/14/limits:1913:16: note: expanded from
macro '__glibcxx_float_n'
1913 | { return __glibcxx_concat3 (__FLT, BITSIZE, _MAX__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:235:1: note: expanded from here
235 | __FLT32_MAX__
| ^
<built-in>:172:64: note: expanded from macro
'__FLT32_MAX__'
172 | #define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1912:7: note: expanded from
macro '__glibcxx_float_n'
1912 | max()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
/usr/include/c++/14/limits:1917:17: note: expanded from
macro '__glibcxx_float_n'
1917 | { return -__glibcxx_concat3 (__FLT, BITSIZE, _MAX__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:238:1: note: expanded from here
238 | __FLT32_MAX__
| ^
<built-in>:172:64: note: expanded from macro
'__FLT32_MAX__'
172 | #define __FLT32_MAX__ 3.40282346638528859811704183484516925e+38F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1916:7: note: expanded from
macro '__glibcxx_float_n'
1916 | lowest()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
/usr/include/c++/14/limits:1933:16: note: expanded from
macro '__glibcxx_float_n'
1933 | { return __glibcxx_concat3 (__FLT, BITSIZE, _EPSILON__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:247:1: note: expanded from here
247 | __FLT32_EPSILON__
| ^
<built-in>:396:67: note: expanded from macro
'__FLT32_EPSILON__'
396 | #define __FLT32_EPSILON__
1.19209289550781250000000000000000000e-7F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1932:7: note: expanded from
macro '__glibcxx_float_n'
1932 | epsilon()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
/usr/include/c++/14/limits:1936:52: note: expanded from
macro '__glibcxx_float_n'
1936 | round_error() _GLIBCXX_USE_NOEXCEPT { return
0.5F##BITSIZE; } \
| ^
<scratch space>:249:4: note: expanded from here
249 | 0.5F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1936:7: note: expanded from
macro '__glibcxx_float_n'
1936 | round_error() _GLIBCXX_USE_NOEXCEPT { return
0.5F##BITSIZE; } \
| ^
/usr/include/c++/14/limits:1989:1: error: use of undeclared
identifier '__builtin_huge_valf32'
/usr/include/c++/14/limits:1960:16: note: expanded from
macro '__glibcxx_float_n'
1960 | { return __builtin_huge_valf##BITSIZE();
} \
| ^
<scratch space>:265:1: note: expanded from here
265 | __builtin_huge_valf32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: use of undeclared
identifier '__builtin_nanf32'
/usr/include/c++/14/limits:1964:16: note: expanded from
macro '__glibcxx_float_n'
1964 | { return __builtin_nanf##BITSIZE("");
} \
| ^
<scratch space>:267:1: note: expanded from here
267 | __builtin_nanf32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: use of undeclared
identifier '__builtin_nansf32'
/usr/include/c++/14/limits:1968:16: note: expanded from
macro '__glibcxx_float_n'
1968 | { return __builtin_nansf##BITSIZE("");
} \
| ^
<scratch space>:269:1: note: expanded from here
269 | __builtin_nansf32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: invalid suffix
'F32' on floating constant
/usr/include/c++/14/limits:1972:16: note: expanded from
macro '__glibcxx_float_n'
1972 | { return __glibcxx_concat3 (__FLT, BITSIZE,
_DENORM_MIN__); } \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:272:1: note: expanded from here
272 | __FLT32_DENORM_MIN__
| ^
<built-in>:304:71: note: expanded from macro
'__FLT32_DENORM_MIN__'
304 | #define __FLT32_DENORM_MIN__
1.40129846432481707092372958328991613e-45F32
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1989:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1971:7: note: expanded from
macro '__glibcxx_float_n'
1971 | denorm_min()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1992:1: error: invalid suffix
'F64' on floating constant
1992 | __glibcxx_float_n(64)
| ^
/usr/include/c++/14/limits:1909:16: note: expanded from
macro '__glibcxx_float_n'
1909 | { return __glibcxx_concat3 (__FLT, BITSIZE, _MIN__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:276:1: note: expanded from here
276 | __FLT64_MIN__
| ^
<built-in>:431:65: note: expanded from macro
'__FLT64_MIN__'
431 | #define __FLT64_MIN__ 2.22507385850720138309023271733240406e-308F64
| ^
In file included from /tmp/tmpaa_arrq6.h:1:
In file included from
/home/re/xfer/gr-atsc3/include/atsc3/alpbbheader_bb.h:13:
In file included from /opt/gnuradio-3.11.0git/include/gnuradio/block.h:17:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/basic_block.h:15:
In file included from
/opt/gnuradio-3.11.0git/include/gnuradio/io_signature.h:19:
In file included from /usr/include/spdlog/fmt/fmt.h:31:
In file included from /usr/include/fmt/core.h:15:
/usr/include/c++/14/limits:1992:1: error: no return
statement in constexpr function
/usr/include/c++/14/limits:1908:7: note: expanded from
macro '__glibcxx_float_n'
1908 | min()
_GLIBCXX_USE_NOEXCEPT \
| ^
/usr/include/c++/14/limits:1992:1: error: invalid suffix
'F64' on floating constant
/usr/include/c++/14/limits:1913:16: note: expanded from
macro '__glibcxx_float_n'
1913 | { return __glibcxx_concat3 (__FLT, BITSIZE, _MAX__);
} \
| ^
/usr/include/c++/14/limits:1894:34: note: expanded from
macro '__glibcxx_concat3'
1894 | #define __glibcxx_concat3(P,M,S) __glibcxx_concat3_ (P,M,S)
| ^
/usr/include/c++/14/limits:1893:35: note: expanded from
macro '__glibcxx_concat3_'
1893 | #define __glibcxx_concat3_(P,M,S) P ## M ## S
| ^
<scratch space>:279:1: note: expanded from here
279 | __FLT64_MAX__
| ^
<built-in>:368:65: note: expanded from macro
'__FLT64_MAX__'
368 | #define __FLT64_MAX__ 1.79769313486231570814527423731704357e+308F64
| ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
Error occurred while running CASTXML xml file does not exist