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From: | Yeo Jin Kuang Alvin (IA) |
Subject: | Re: [Discuss-gnuradio] Underflow and Overflow |
Date: | Wed, 23 May 2018 06:59:59 +0000 |
Hi all, Btw in this flowgraph, I’ve noticed there is nothing transmitting out when I change the file source from repeat to no repeat. Originally, I thought the waveform
stored in file sink is immediately transmitted out from file source and continue the process till I stop the flowgraph. When I on the repeat, signal starts transmitting out. Why is this so? Thank you in advanced! From: Kevin McQuiggin [mailto:address@hidden
Hi Alvin:
On May 22, 2018, at 6:38 PM, Yeo Jin Kuang Alvin (IA) <address@hidden> wrote: I want to do a transceiver, so instead of receiving a signal elsewhere out of the board. I self-generate out a chirp signal internally in USRP B210 and do a
loopback to the receive port and then re-transmit out using another transmit port. You will have to be very careful with this. Looping back the USRP output port back to the input port can blow the front end of the USRP receiver. Make sure that you use an external attenuator, not just a loopback cable. I would start
with 30 dB. Please tell the group more about your “transceiver": this is a broad statement, what are you trying to achieve? There are several different types of transceivers and the implementation will depend upon the application you have in mind. Kevin
Thank you in advanced! From: Kevin
McQuiggin [mailto:address@hidden] Hi Alvin: Well, for one thing, you are trying to write USRP output samples to a file at 30 MB per second. That is likely to generate overflows. Your flowgraph indicates to me that you haven’t fully internalized how gnuradio works and how it interacts with whatever front-end hardware you are using. Don’t take this comment as overly critical, we all (myself included) started with only basic understanding, and had to build our skills from there. I suggest going to the gnuradio web site and following, as a start, the set of tutorials that have already been recommended by others on the list. They will help you as
you start to climb the learning curve! Kevin Sent from my iPhone
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