Re: [Discuss-gnuradio] sending sine wave, but created another unwanted frequency component

2018-01-22 Thread D J
What he said^^ https://en.wikipedia.org/wiki/Nyquist_frequency On Sun, Jan 21, 2018 at 12:18 PM, Jeff Long wrote: > Try reducing the RX filter bandwidth, the gain of the receiver and/or > transmitter, or moving the TX and RX apart, and see what happens. This is > aliasing, and probably has noth

Re: [Discuss-gnuradio] sending sine wave, but created another unwanted frequency component

2018-01-22 Thread Yang Liu
Hi D J, Thanks for the link, this is alias. If I fix the waveform frequency, say 2.4e6, and increase tx sampling rate from 5e6 to 10e6, this problem should be solved right? I just did experiment, and found the second component disappeared. Thanks, Yang On Mon, Jan 22, 2018 at 9:39 AM, D J wrote:

Re: [Discuss-gnuradio] sending sine wave, but created another unwanted frequency component

2018-01-22 Thread Yang Liu
Hi Jeff, I tried to reduced the gain and the second component became weaker, but it is always there. If this is alias, I am wondering if I choose the wrong tx sampling rate. In this case, the sine wave frequency = 2.4e6, current tx sampling rate = 5e6. I tried to increase sampling rate from 5e6 to

[Discuss-gnuradio] oot modules in grc

2018-01-22 Thread Volker Schroer
For some times oot modules are sorted into a subtree (no module specified ). On 'mouse over' the developers are asked to update their xml - files with module names. If I look into the gnuradio xml files the module name always seems to be [core]. Are there recommendations for oot- modules or

Re: [Discuss-gnuradio] oot modules in grc

2018-01-22 Thread sumit kumar
Are you using gr_modtool makexml command. Sometimes its not very much helpful(it also says so). I always take any example xml from the existing libraries and then paste my stuff over them. On 22 January 2018 at 22:57, Volker Schroer wrote: > For some times oot modules are sorted into a subtree (

[Discuss-gnuradio] Is It Possible to Access Multiple USRP N2x0s in the same subnet?

2018-01-22 Thread Zhongyuan Zhao
I want to access multiple USRPs from a host for MIMO. Currently, I need change IP address of host (subnet) to be able to access each USRP. https://files.ettus.com/manual/page_usrp2.html - Configuration for USRP2 device 0: - Ethernet interface IPv4 address: *192.168.10.1* - Ethernet

Re: [Discuss-gnuradio] oot modules in grc

2018-01-22 Thread Ron Economos
The default in gr_modtool is to create a category with the module name. For example, gr-whatevs would end up in the "whatevs" category. However, since it's common to capitalize categories, it should probably be changed to "Whatevs". I just pushed a commit to gr-paint to use the category "Paint

Re: [Discuss-gnuradio] Is It Possible to Access Multiple USRP N2x0s in the same subnet?

2018-01-22 Thread Marcus D. Leech
On 01/22/2018 05:32 PM, Zhongyuan Zhao wrote: I want to access multiple USRPs from a host for MIMO. Currently, I need change IP address of host (subnet) to be able to access each USRP. https://files.ettus.com/manual/page_usrp2.html * Configuration for USRP2 device 0: o Ethernet interfac

[Discuss-gnuradio] VOLK: What Could Make volk_32fc_index_max_16u() Go Wrong?

2018-01-22 Thread Gilad Beeri (ApolloShield)
Hi, I have the following function: float blk::func(uint16_t *argmax, gr_complex *vector, uint32_t vlen) { cout << "0: " << vector[0] << " (" << abs(vector[0])<< ")" << " 996: " << vector[996] << " (" << abs(vector[996]) << ") " << " 999: " << vector[999] << " (" << abs(vector