[USRP-users] [EXT] Re: E312 RX_B issue

Beeman, Isaac L. ilbeeman at wpi.edu
Thu Jan 16 13:12:46 EST 2020


I am using UHD_3.15.0.0-0-gdbaf4132.

Isaac Beeman

From: Sam Reiter <sam.reiter at ettus.com>
Sent: Wednesday, December 18, 2019 2:16 PM
To: Beeman, Isaac L. <ilbeeman at wpi.edu>
Cc: usrp-users at lists.ettus.com <usrp-users at lists.ettus.com>
Subject: [EXT] Re: [USRP-users] E312 RX_B issue


What version of UHD are you using to elicit this behavior?

Sam Reiter
Ettus Research

On Mon, Dec 9, 2019 at 9:21 PM Beeman, Isaac L. via USRP-users <usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>> wrote:

Hello group,

I have run into an issue with the RX_B port (channel 1) on the E312 that I haven’t been able to make any sense of.

RX_A (channel 0) works great: I get clear in-phase and quadrature components that I have been able to graph<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2FdQRl5mN&data=02%7C01%7Cilbeeman%40wpi.edu%7C5bf8fdff9ec647f642e508d783eee06e%7C589c76f5ca1541f9884b55ec15a0672a%7C0%7C0%7C637122935264104241&sdata=zKk3L704ojjJ4i8puoG%2FpQEvdWkP0ZD%2FJUp0%2FTkkdOU%3D&reserved=0>. When I do the same thing with RX_B (channel 1), I get something completely unexpected<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2F4WgU5R5&data=02%7C01%7Cilbeeman%40wpi.edu%7C5bf8fdff9ec647f642e508d783eee06e%7C589c76f5ca1541f9884b55ec15a0672a%7C0%7C0%7C637122935264104241&sdata=tJdj4Zv1ZoG1VDsXkpTNybVgovwxVgUl54L9FNvumm4%3D&reserved=0>. I am using the same rate (=0.5 Msps) frequency (=900 MHz), gain (=50 dB), bandwidth (=200 kHz) on each and have had this happen whether I use both channels at the same time or read from RX_B individually.

I haven’t had anything like this happen when I transmit on both TX_A and TX_B, and I have tested this on multiple USRP E312 radios and 900 MHz antennas to make sure it wasn’t something unrelated to the channel/port itself.

Does anyone know what could be happening?

-Isaac Beeman

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