I am injecting a -30dBm signal. Tried setting the tx and rx gain but yet to see the baseband signal. Additionally checked the working each channels, they are functioning properly.
./rfnoc_radio_loopback --rx-freq=4e9 --tx-freq=3e9 --rate=200e6 --spp=600 --tx-gain=10 --rx-gain=10 ________________________________ From: Marcus D. Leech <patchvonbr...@gmail.com> Sent: Thursday, October 25, 2018 8:37:28 PM To: Chatterjee, Pratik Cc: usrp-users@lists.ettus.com Subject: Re: [USRP-users] downconversion in rfnoc-radio_loopback On 10/25/2018 07:03 PM, Chatterjee, Pratik wrote: Thank you for your response. I tried transmitting at a different frequency, still didn't see the baseband signal. Seeing a 3GHz carrier on the output ./rfnoc_radio_loopback --rx-freq=4e9 --tx-freq=3e9 --rate=200e6 --spp=600 I forgot to mention that I am using a wired setup. Signal generator to splitter, splitter to sdr rx and Scope, the sdr tx to Scope. ________________________________ From: USRP-users <usrp-users-boun...@lists.ettus.com><mailto:usrp-users-boun...@lists.ettus.com> on behalf of Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com><mailto:usrp-users@lists.ettus.com> Sent: Thursday, October 25, 2018 5:22:09 PM To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> Subject: Re: [USRP-users] downconversion in rfnoc-radio_loopback On 10/25/2018 04:57 PM, Chatterjee, Pratik via USRP-users wrote: Hi, While testing the rfnoc_radio_loopback.cpp from the 6af6ac3 commit on master, I found that if I send a 50 MHz signal on top of a 4 GHz carrier to the SDR, on the loopback output I just get a 4GHz carrier. I looked into the rfnoc_radio_loopback.cpp file and found no DDC or DUC blocks. Could this be the reason for receiving no baseband signal in loopback (no down conversion logic happening) or am I missing something Has anyone used this file before? Arguments are as follows ./rfnoc_radio_loopback --rx-freq=4e9 --tx-freq=4e9 --rate=200e6 --spp=600 thanks, VP Your TX and RX frequencies are the same--how are you isolating the antennae from one another? What happens if you make your TX frequency different from your RX frequency (which is usually how a repeater works). You should probably specify an RX gain and TX gain -- how much power are you injecting into the RX side? More than -15dBm is near the linearity limits, and much "louder" and you risk device damage to the RX.
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