Hi Mihkel, A couple of points: 1. The sample time is 1/1023000, not the sample rate. 2. You shouldn't need any additional blocks before you save the signal to workspace. Hth, Mike From: USRP-users [mailto:usrp-users-bounces@lists.ettus.com] On Behalf Of Mihkel M via USRP-users Sent: Thursday, April 27, 2017 4:55 AM To: usrp-users@lists.ettus.com Subject: [USRP-users] B210 GPS L1 receviver in Simulink Hi. My friend has project, where he has also couple of questions: "I am trying to receive and play GPS L1 signal using Simulink and B210. For observation I am using Ucenter 5.0. An active GPS antenna is used for receiving. I am not sure what the receiver block parameters should be because based on my calculations (decimation=master clock rate*sample time) I used Fc=1.57542 Ghz, master clock rate 6.138Mhz, decimation is 6 and sample rate is 1/1023000. Should I use some additional blocks before saving the signal to workspace and playing it back from workspace to the transmitter block? In additon to that can someone please explain how IF is formulated using receiver block parameters?" Mihkel.