Hi Marcus/Muller, I was trying a simple flow graph to implement what you said earlier : “ If it were *my* problem, I'd probably have a couple of vector sources of alternating 1s and 0s, interpolate them up to the desired sample rate X the switching interval, and multiply the stream going into the USRP by that stream of 1s and 0s. “
To make things simpler, I am trying: Vector source (0,1) multiplying with a sine wave. As an out put I want 1 period of sine wave (say 1kHz frequency) and the next period to be zero. I believe I need to set the sample rate and match this period with the vector source. Can you just help be in deducing this please. Having hard time to sort this out ☹ Thanks Ayaz From: Müller, Marcus (CEL)<mailto:muel...@kit.edu> Sent: Wednesday, July 18, 2018 6:34 AM To: discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org>; ayazmah...@hotmail.com<mailto:ayazmah...@hotmail.com>; mle...@ripnet.com<mailto:mle...@ripnet.com> Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup The Selector block comes from the "deprecated" category, and that for good reason: Don't use it, it causes a huge teardown/setup effort behind the scenes, and not all is guaranteed to work. Follow Marcus' advice with the 0/1 multiplication and offset tuning. Best regards, the other Marcus On Tue, 2018-07-17 at 23:06 +0000, Ayaz Mahmud wrote: Hey Marcus, I think the Selector block works well with my setup. But I need a solution with which I can do a dynamic change in the input/output index. Can you let me know how is this possible Ayaz From: Ayaz Mahmud<mailto:ayazmah...@hotmail.com> Sent: Tuesday, July 17, 2018 4:39 PM To: Marcus D. Leech<mailto:mle...@ripnet.com>; "Müller, Marcus (CEL)"<mailto:muel...@kit.edu>; discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org> Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup Hi Marcus, The situation still is same. By browsing the archive I found some switching of blocks with SELECTOR. Is there any example that will be helpful on how this block actually functions ? Thanks Ayaz From: Marcus D. Leech<mailto:mle...@ripnet.com> Sent: Monday, July 16, 2018 1:26 PM To: Ayaz Mahmud<mailto:ayazmah...@hotmail.com>; "Müller, Marcus (CEL)"<mailto:muel...@kit.edu>; discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org> Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup On 07/16/2018 02:05 PM, Ayaz Mahmud wrote: Hi Marcus, The issue is even I put the vector source toggling with 1 and 0s it transmit a signal. So I need something that will not transmit at all and switch between these 2 radio chains. Thanks, Ayaz You're probably seeing the residual LO leakage during periods of "no transmit". You can try using offset-tuning to move the leakage out-of-band: Use: uhd.tune_request(frequency,offset) In the UHD sink for the "frequency" field. From: Marcus D. Leech<mailto:mle...@ripnet.com> Sent: Saturday, July 14, 2018 8:15 PM To: Ayaz Mahmud<mailto:ayazmah...@hotmail.com>; "Müller, Marcus (CEL)"<mailto:muel...@kit.edu>; discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org> Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup On 07/14/2018 06:40 PM, Ayaz Mahmud wrote: Hi Muller / Marcus, I got the testing right now, but unfortunately it doesn’t work while I put it in my original file. Here is the attached .grc where I have used vector source as input and multiply a period with 1 and then with zeros on one radio channel and opposite on the other. Can you please have a look, and check if I am doing anything wrong ? Ayaz You're asking us to debug a very complex signal flow. Why don't you try something a *lot* simpler to get the TX-flow-switching-logic correct first, and then work up from there.
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