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Re: [Discuss-gnuradio] uhd_two_tone_loopback.grc example (Cindy Zhang)

From: Michael Dickens
Subject: Re: [Discuss-gnuradio] uhd_two_tone_loopback.grc example (Cindy Zhang)
Date: Thu, 13 Sep 2018 10:20:32 -0400

Hi Cindy - It is true that the B200 can generally support 60 MSps ("60M") sustained throughput over USB3. That's -total combined- throughput for all Rx and Tx streams. The example "uhd_two_tone_loopback.grc" performs both Rx and Tx via the USRP, so if you set the sample rate to 60M, then you're trying to perform Rx at 60M and Tx at 60M, for a combined 120M ... which just won't work. Try lowering the rate to 30M & seeing if that works. If not, drop it to 25M. Then play with it to find the max rate at which this example works. Just remember that the rate here is actually 1/2 of the total equivalent rate being sustained since the B200 is doing both Rx and Tx. Hope this is useful! - MLD

On Thu, Sep 13, 2018, at 9:49 AM, Cindy Zhang wrote:
The device is B200. It says the maximum sampling rate it can deliver is above 60M. Any other thoughts on this problem?

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