# TX/RX with USRPN200 and GNURadio **URL:** \ **Category:** GNU Radio\ **Created:** [October 17, 2014, 3:35pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603 "2014-10-17T15:35:46Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [October 17, 2014, 3:35pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/1 "2014-10-17T15:35:46Z")
* * * Discuss-gnuradio mailing list removed\_email\_address@domain.invalid [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 17, 2014, 3:41pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/2 "2014-10-17T15:41:07Z")
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**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 18, 2014, 11:07am UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/3 "2014-10-18T11:07:41Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ruben is absolutely right! In loopback configuration with devices as sensitive as the WBX, always use an attenuator. Also, in direct loopback, you really shouldn’t need the RX gain, and only risk damaging the daughterboard and in the worst case your USRP’s ADC by generating too much power. On 17.10.2014 15:39, [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio > mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJUQi2BAAoJEAFxB7BbsDrLHn8H/2ry64VL8rOqoH7WtdlsoKWq ZC8akgji8XDqz3pqnFQDK0IRXIhi35qBwgxPTZVzgnYgsm8qTTGuO2PJzd6njGQK QLXp2vjzXlANARShSlWVPGa7lBZvXqOBYxZ/ixQTSaSt4zyOaifF0hOkvYSDvuXN h285z+eFN9sKo7aGkzkN3oGleqL0R0/YTtUB4IFYVVbG0aOSrtAmL9B9M7MMIHrQ svP0m5hpF2xtdpCVI2a7XeBm6CpjbH5wle5lXmtJJQCm45iRDC5XTeYfwf+FFj1n h8oNw6PhThxXx1iB+Kf73GTz50aQFB8Sx38U1TZrIUw5QTF6F8Q/9ce1Z3MEb6Y= =AniS -----END PGP SIGNATURE----- ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 20, 2014, 7:55am UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/4 "2014-10-20T07:55:30Z")
Ok!! I have Ubuntu 12.04 in this PC [http://www.amazon.com/HP-FF825AV-Workstation-2-8GHz-nVidia/dp/B00B90WIGE](http://www.amazon.com/HP-FF825AV-Workstation-2-8GHz-nVidia/dp/B00B90WIGE) (Quad Core and 12GB RAM). With the scheme with loop I have: Generating: “/home/caruiz\_ext/Escritorio/generadoresGNU/top\_block.py” Generating: “/home/caruiz\_ext/Escritorio/generadoresGNU/top\_block.py” Executing: “/home/caruiz\_ext/Escritorio/generadoresGNU/top\_block.py” linux; GNU C++ version 4.6.3; Boost\_105300; UHD\_003.006.002-64-g92b0b7ab – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes Using Volk machine: sse4\_2\_64 UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU What is the problem? 2014-10-18 11:06 GMT+02:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 20, 2014, 9:55am UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/5 "2014-10-20T09:55:06Z")
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**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 20, 2014, 9:24am UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/6 "2014-10-20T09:24:45Z")
> linux; GNU C++ version 4.6.3; Boost\_105300; UHD\_003.006.002-64-g92b0b7ab > > – Opening a USRP2/N-Series device… > – Current recv frame size: 1472 bytes > – Current send frame size: 1472 bytes > Using Volk machine: sse4\_2\_64 > UU[..more U…] > > What is the problem? Maybe there is none? You don’t write anything about your rates etc., but U means underrun, which in turn means your computer isn’t producing data fast enough (or on time). M ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 20, 2014, 12:35pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/7 "2014-10-20T12:35:10Z")
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**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [October 20, 2014, 1:51pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603/8 "2014-10-20T13:51:56Z")
On 10/20/2014 12:33 PM, Carlos Alberto Ruiz Naranjo wrote: > Another question. > > I have a GPS receiver ( [http://u-blox.com/images/downloads/Product\_Docs/LEA-NEO-6T\_ProductSummary\_(GPS.G6-HW-09020).pdf](http://u-blox.com/images/downloads/Product_Docs/LEA-NEO-6T_ProductSummary_%28GPS.G6-HW-09020%29.pdf) > ) with a Osmo board ( [Making sure you're not a bot!](http://openbsc.osmocom.org/trac/wiki/osmo-lea6t-gps) ) > > Can I directly connect the USRP (WBX) to the GPS receiver? > Can I damage the WBX board with thepower of receiver RF port? Carlos, please don’t mix questions in threads – they get lost very easily that way. Also, for USRP-specific questions I recommend the usrp-users mailing list. You can definitely damage daughterboards with too much rx power. I’m not sure why you’d connect this board to the WBX – or do you want to connect it to the REF in ports? M