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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] Ettus N210 GMSK 9600 |
Date: | Wed, 23 Mar 2016 15:29:10 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 03/23/2016 03:14 PM, Tom Golden
wrote:
What output level is the RF modem producing? Are you using attenuators between it and the RF input of the USRP? I note that you have the RF gain on your capture set to 0. Also, I don't recall whether the polyphase resampler requires that the input already be Nyquist-limited before it gets resampled. I know some of the other resamplers do that, otherwise, you get aliases in your output passband. Since you're looking at a 9600BPS signal, you should probably have sampled this at 250ksps--the lowest rate possible with the N210-- that makes filtering later less computationally intensive.
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