Re: how to generate a certain band width white noise

[Ron Economos]

This should work better. :-)

Ron

On 3/21/21 22:03, Ron Economos wrote:

It's for 3.9. Let me regenerate it for 3.7. Hang on.

Ron

On 3/21/21 21:56, james jordan wrote:

Hi Ron,

i open your file and have this error:

Loading: "/home/w/Downloads/whitenoise.grc"

Error: /home/w/Downloads/whitenoise.grc:1:1:FATAL:PARSER:ERR_DOCUMENT_EMPTY: Start tag expected, '<' not found

>>> Failure

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/gui/MainWindow.py", line 278, in new_page

    file_path=file_path,

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/gui/NotebookPage.py", line 47, in __init__

    initial_state = flow_graph.get_parent().parse_flow_graph(file_path)

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/core/Platform.py", line 295, in parse_flow_graph

    ParseXML.validate_dtd(flow_graph_file, Constants.FLOW_GRAPH_DTD)

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/core/ParseXML.py", line 53, in validate_dtd

    raise XMLSyntaxError(parser.error_log)

XMLSyntaxError: /home/w/Downloads/whitenoise.grc:1:1:FATAL:PARSER:ERR_DOCUMENT_EMPTY: Start tag expected, '<' not found

what is the gnuradio version for this grc?

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From: james jordan <james.jordan.999@hotmail.com>
Sent: Monday, March 22, 2021 12:42 PM
To: Ron Economos <w6rz@comcast.net>; discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
Subject: Re: how to generate a certain band width white noise

 

many thanks

---

From: Discuss-gnuradio <discuss-gnuradio-bounces+james.jordan.999=hotmail.com@gnu.org> on behalf of Ron Economos <w6rz@comcast.net>
Sent: Monday, March 22, 2021 12:26 PM
To: discuss-gnuradio@gnu.org <discuss-gnuradio@gnu.org>
Subject: Re: how to generate a certain band width white noise

 

Here's a flow graph that should get you started. The "width" parameter controls the bandwidth of the noise (but can't be greater than the sample rate).

It's using a UHD sink block for an Etttus B210. Use a sink block that's appropriate for your hardware. Also, be sure to disable the throttle and null sink when using hardware.

Ron

On 3/21/21 20:27, james jordan wrote:

Hi Kyeong,

thanks for your reply. what is the default bandwidth for noise source. from my understanding resampler did not modify bandwidth.

---

From: Kyeong Su Shin <ksshin@postech.ac.kr>
Sent: Sunday, March 21, 2021 5:17 PM
To: james jordan <james.jordan.999@hotmail.com>; GNURadio Discussion List <discuss-gnuradio@gnu.org>
Subject: Re: how to generate a certain band width white noise

 

Hello Jordan:

Just use a "Noise Source" block and a resampler block (if needed; best be avoided) to adjust the bandwidth.  The quality of your "white noise" will depend on the resampler and the transmitter hardware, though.

Regards,

Kyeong Su Shin

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보낸 사람: james jordan <james.jordan.999@hotmail.com> 대신 Discuss-gnuradio <discuss-gnuradio-bounces+ksshin=postech.ac.kr@gnu.org>
보낸 날짜: 2021년 3월 21일 일요일 오후 12:40
받는 사람: GNURadio Discussion List <discuss-gnuradio@gnu.org>
제목: how to generate a certain band width white noise

 

Hi,

i want to use white noise to test a certain band. such as 2Mhz band width white noise. how to do this?

whitenoise.grc
Description: application/gnuradio-grc