Try a slightly higher RX gain. Sent from my iPhone
> On Oct 26, 2018, at 1:46 PM, Chatterjee, Pratik <chatt...@msu.edu> wrote: > > 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> on behalf of Marcus D. >> Leech via USRP-users <usrp-users@lists.ettus.com> >> Sent: Thursday, October 25, 2018 5:22:09 PM >> To: 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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