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Today's Topics:
1. Re: RFNoC: using LO Offset to fine tune receiver (Dixon, James L)
2. ADC self-test failed (Sam Vogel)
3. TDMA based Multiple Access Channel using NI USRP 2901
(Ammar Mahmood)
4. E310 transmitting signal using tx_samples_from_file (olivani)
----------------------------------------------------------------------
Message: 1
Date: Tue, 13 Jun 2017 19:48:15 +0000
From: "Dixon, James L" <[email protected]>
To: "Marcus D. Leech" <[email protected]>,
"[email protected]" <[email protected]>
Subject: Re: [USRP-users] RFNoC: using LO Offset to fine tune receiver
Message-ID:
<c6947bb11568824d9ea822ba98f7c6c285a47...@rrc-ats-exmb2.ats.atsinnovate.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
My original design (about which I wrote the previous email) only included two
RFNoC:Radio blocks, so that I can do an RF loopback. I followed Nick Foster's
tutorial on creating an RF Loopback, and I got it working. However, I didn't
have fine enough control of the LO frequency for my application. In reply to
my previous email, I was told that I need to add a DDC block to my design since
the LO Offset functionality is in there. I therefore added RFNoC:DDC and
RFNoC:DUC blocks to my design, since I need the RF loopback functionality.
However, when I tried running it, it didn't output anything. It looked like it
was running, with no errors, but there was no output, and the RX and TX LEDs
were not lit (I think they blinked for a fraction of a second when I first
started it). I then though that I may need an RFNoC: DmaFIFO block between the
DDC and the DUC. I put it in, and now I get the following error:
[cid:690be0c0-f588-4d5e-a1c2-1d0c911cd80e]
Any ideas?
Thanks,
Jim
________________________________
From: USRP-users [[email protected]] on behalf of Marcus D.
Leech via USRP-users [[email protected]]
Sent: Thursday, June 08, 2017 8:12 PM
To: [email protected]
Subject: Re: [USRP-users] RFNoC: using LO Offset to fine tune receiver
On 06/08/2017 06:31 PM, Dixon, James L via USRP-users wrote:
Hi,
I have a system working with RFNoC. I have created a flowgraph in grc using
RFNoC: Radio blocks for input and output. I understand that I should have
sub-Hz tuning resolution, but I don't seem to be able to achieve anything
better than about 12 kHz (using a 1.8 GHz center frequency). I just read that
the LO Offset is used to fine-tune the radio, but I can't figure out how to
enter a setting for the LO Offset in the RFNoC: Radio block. Or is there a way
to enter a value for the LO Offset by editing the resulting Python code, maybe
using a UHD command? Some example code would be very helpful, too.
Thanks,
Jim
For fine tuning, you'll need the DDC block as well. It is typical that
broad-band synthesizers have fairly coarse tuning steps.
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Message: 2
Date: Tue, 13 Jun 2017 16:55:06 -0400
From: Sam Vogel <[email protected]>
To: [email protected]
Subject: [USRP-users] ADC self-test failed
Message-ID:
<CACjmUqhMtFAdqM=TGLxD24RYrT5zbHKdh6mkyUusT=ht+5g...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi All, I?m running into an issue with our x300 revision E. Any help
resolving this is greatly appreciated.
Following the procedure to recover the EEPROM yields a problem.
[vogels@lprbld12 utils]$ ./usrp_burn_mb_eeprom
--args="recover_mb_eeprom,addr=192.167.10.111" --values="revision=5"
Creating USRP device from address: recover_mb_eeprom,addr=192.167.10.111
-- X300 initialization sequence...
-- Determining maximum frame size... 8000 bytes.
-- Setup basic communication...
-- Loading values from EEPROM...
UHD Warning:
UHD is operating in EEPROM Recovery Mode which disables hardware
version checks.
Operating in this mode may cause hardware damage and unstable radio
performance!
-- Setup RF frontend clocking...
UHD Warning:
Environment variable 'USRP_X300_REFERENCE_CLOCK_RATE_HZ' not found,
defaulting to reference clock rate of 10000000.000000 Hz
-- Using specified reference / master clock rates of 10.0 / 200.0 MHz
-- Radio 1x clock:200
-- Initialize Radio0 control...
-- Performing register loopback test... pass
-- Initialize Radio1 control...
-- Performing register loopback test... pass
Error: RuntimeError: ADC self-test failed! Ramp checker status: {ADC0_I=Bit
Errors!, ADC0_Q=Bit Errors!, ADC1_I=Good, ADC1_Q=Good}
Thanks !
-Sam
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Message: 3
Date: Wed, 14 Jun 2017 10:37:06 +0500
From: Ammar Mahmood <[email protected]>
To: [email protected]
Subject: [USRP-users] TDMA based Multiple Access Channel using NI USRP
2901
Message-ID:
<caozxrwjpnt_ukbfxg4ku4xv5v2q0vgtnw93-dju+mp-+v_s...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
I am using an experimental setup using two transmitters and one receiver. I
want only one transmitter to transmit at a given time so as to avoid
collisions. For this purpose, I want to create a TDMA based multiple access
channel using NI USRP 2901. How can I achieve this task?
Best,
Ammar
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Message: 4
Date: Wed, 14 Jun 2017 09:00:08 -0400
From: olivani <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] E310 transmitting signal using
tx_samples_from_file
Message-ID:
<CABq0VizOrAUHH14YkLCazJJjBa=uc8penzawia+ccwmas3s...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi ,
I am transmitting a 1MHz complex IQ data signal using tx_samples_from_file.
When I set the freq to be 1GHz and transmit the data and check it with a
spectrum analyzer.
The same data when I change the freq carrier to 3GHz I see a decrease in
amplitude of the signal .
I did not change any gain parameter.
Has any one noticed this before , if so I would like to understand the
reason behind it.
Thanks and Regards,
Olivani Subbukutty
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