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From: | Chad Spooner |
Subject: | Re: Confusion about 'ports' |
Date: | Wed, 16 Mar 2022 15:17:42 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 |
Marcus:
That did it! Thanks much.
I was definitely confused about being able to use both TX/RX and RX2 on subdev B to receive two signals. When I was doing that, I was thinking 'B:0' was sufficient--same device. But switching the antenna back to A, RX2 (as in the original two-block configuration) and using 'A:0 B:0' worked, so then I switched back and tried 'B:0 B:0' but that doesn't work.
Now I also understand (a little bit better anyway) the
documentation
I appreciate your patience and skill Marcus,
C
On 2022-03-16 17:31, Chad Spooner wrote:
You need to specify a subdev spec of:Marcus:
Yes, I did miss that reply! Very sorry about that. Let me try to answer your questions:
First, I did try to use a single Source block with two channels on the advice of a colleague. I've been unable to get that to work either. (More on that below, after I answer your questions.)
The x310 has WBX (A) and UBX (B) daughtercards.
The x310's UBX RX2 input is coming from the TX/RX output of an N210 with a WBX daughtercard. The N210 is generating a DSSS signal and transmitting it on TX/RX.
The x310's WBX RX2 input is coming from a passive antenna (Ettus WA5JVB Log Periodic 850 MHz to 6500 MHz).
The x310's UBX TX/RX transmits the sum of the UBX RX2 and WBX RX2 signals.
A third SDR (x300) receives the x310's UBX TX/RX signal and that is the USRP I fetch data from using uhd_rx_cfile.
********
A:0 B:0
Right now, you just have B:0, so it's trying to produce two channels from a single sub-device ,and, obviously, failing.
-- Chad M. Spooner, PhD NorthWest Research Associates 301 Webster Street Monterey, CA 93940 cmspooner@nwra.com 831 582 4904 cyclostationary.blog
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