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.


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------------------------------------------------------------------------
*From:* Kyeong Su Shin <[email protected]>
*Sent:* Sunday, March 21, 2021 5:17 PM
*To:* james jordan <[email protected]>; GNURadio Discussion List <[email protected]>
*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
------------------------------------------------------------------------
*보낸 사람:* james jordan <[email protected]> 대신 Discuss-gnuradio <[email protected]>
*보낸 날짜:* 2021년 3월 21일 일요일 오후 12:40
*받는 사람:* GNURadio Discussion List <[email protected]>
*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?


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Attachment: whitenoise.grc
Description: application/gnuradio-grc

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