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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