TX/RX with USRPN200 and GNURadio


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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, [email protected] wrote:

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Ok!!

I have Ubuntu 12.04 in this PC
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 [email protected]:


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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


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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

) with a Osmo board ( Osmo-lea6t-gps - Miscellaneous Projects - Open Source Mobile Communications )

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