On 2022-03-16 18:17, Chad Spooner wrote:
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
https://files.ettus.com/manual/page_configuration.html
I appreciate your patience and skill Marcus,
C
A card like WBX or UBX has a *SINGLE* receive chain, and *THAT CHAIN*
can be switched to either "look" at RX2 or the TX/RX port. In
half-duplex configurations, it's
common to have a single antenna that is dynamically either connected
to the receiver (RX) or transmitter (TX), but there are also
configurations where the receiver
(RX) needs to be completely isolated (on a different physical antenna
port) from the transmitter (TX).
Sub-device specs are of the general form:
<which-side>:<name>
For X310, that's "A" and "B" for "which-side", and the "<name>"
component depends on the daughtercard that is installed there.
On 3/16/22 2:42 PM, Marcus D. Leech wrote:
On 2022-03-16 17:31, Chad Spooner wrote:
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.
********
You need to specify a subdev spec of:
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
cmspoo...@nwra.com
831 582 4904
cyclostationary.blog
