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View all threadsmulti-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I send 3 different signals I just see 1 signal frequency domain at oscilloscope but I can see 3 different signal at qt guı frequency sink.UHD usrp sink block just send center freq . And I try sending with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
On 24/12/2024 01:10, Hamdüsena BİLGİ (BİLGEM) via USRP-users wrote:
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I
send 3 different signals I just see 1 signal frequency domain at
oscilloscope but I can see 3 different signal at qt guı frequency
sink.UHD usrp sink block just send center freq . And I try sending
with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com
The maximum sample rate of the E320 for a single channel is 61.44Msps.
So, that's your first problem.
Also, if you're adding signals together, try lowering the amplitude of
the individual signals to 0.33, since you have
3 of them. The maximum total signal amplitude should never exceed
1.0, and in practice, somewhat lower
than that, in order to avoid saturation, and the resulting distortion.
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M Hz and send them with freq=150MHz carrier frequency. Your output signals should be at 250MHz, 400Mhz and 450Mhz. You should take mesaurements around these frequencies.
Best,
Ceren
From: Hamdüsena BİLGİ (BİLGEM) via USRP-users usrp-users@lists.ettus.com
Sent: Tuesday, December 24, 2024 9:10:39 AM
To: usrp-users usrp-users@lists.ettus.com
Subject: [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I send 3 different signals I just see 1 signal frequency domain at oscilloscope but I can see 3 different signal at qt guı frequency sink.UHD usrp sink block just send center freq . And I try sending with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
[X]
On 25/12/2024 01:31, Ceren Karaköse wrote:
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M Hz
and send them with freq=150MHz carrier frequency. Your output
signals should be at 250MHz, 400Mhz and 450Mhz. You should take
mesaurements around these frequencies.
Best,
Ceren
Please read what I wrote on this subject earlier. The MAXimum
sample-rate of the E320 is 61.44Msps. You cannot represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which they
then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the sampling
rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as well as
general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
https://kb.ettus.com/Knowledge_Base
And note the "Getting Started" here:
From: Hamdüsena BİLGİ (BİLGEM) via USRP-users
usrp-users@lists.ettus.com
Sent: Tuesday, December 24, 2024 9:10:39 AM
To: usrp-users usrp-users@lists.ettus.com
Subject: [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I
send 3 different signals I just see 1 signal frequency domain at
oscilloscope but I can see 3 different signal at qt guı frequency
sink.UHD usrp sink block just send center freq . And I try sending
with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com
Hi,
I followed your instructions and can see 3 different signals on the oscilloscope. However, I have a small issue. I set the following parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184 MHz. However, on the oscilloscope, I see them at 205 MHz, 201 MHz, and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can transmit and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
Kimden: "Marcus D. Leech" patchvonbraun@gmail.com
Kime: "usrp-users" usrp-users@lists.ettus.com
Gönderilenler: 25 Aralık Çarşamba 2024 20:11:29
Konu: [USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M Hz and send them with freq=150MHz carrier frequency . Your output signals should be at 250MHz, 400Mhz and 450Mhz. You should take mesaurements around these frequencies.
Best,
Ceren
Please read what I wrote on this subject earlier. The MAXimum sample-rate of the E320 is 61.44Msps. You cannot represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the sampling rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as well as general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
[ https://kb.ettus.com/Knowledge_Base | https://kb.ettus.com/Knowledge_Base ]
And note the "Getting Started" here:
[ https://kb.ettus.com/E320_Getting_Started_Guide | https://kb.ettus.com/E320_Getting_Started_Guide ]
BQ_BEGIN
From: Hamdüsena BİLGİ (BİLGEM) via USRP-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Sent: Tuesday, December 24, 2024 9:10:39 AM
To: usrp-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Subject: [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I send 3 different signals I just see 1 signal frequency domain at oscilloscope but I can see 3 different signal at qt guı frequency sink.UHD usrp sink block just send center freq . And I try sending with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ] To unsubscribe send an email to [ mailto:usrp-users-leave@lists.ettus.com | usrp-users-leave@lists.ettus.com ]
BQ_END
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
On 26/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
Hi,
I followed your instructions and can see 3 different signals on the
oscilloscope. However, I have a small issue. I set the following
parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184 MHz.
However, on the oscilloscope, I see them at 205 MHz, 201 MHz, and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can transmit
and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
When you say "loopback in Gnu Radio" do you mean a loop-back within the
flow-graph, without using the radio? Or an analog
loopback between TX/RX ports on the radio?
When you're using the flow-graph and transmitting from the USRP, do you
see any "U" (under-runs) while transmitting?
How about when you're using your Python code?
*Kimden: *"Marcus D. Leech" patchvonbraun@gmail.com
*Kime: *"usrp-users" usrp-users@lists.ettus.com
*Gönderilenler: *25 Aralık Çarşamba 2024 20:11:29
*Konu: *[USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M
Hz and send them with freq=150MHz _carrier frequency_. Your output
signals should be at 250MHz, 400Mhz and 450Mhz. You should take
mesaurements around these frequencies.
Best,
Ceren
Please read what I wrote on this subject earlier. The MAXimum
sample-rate of the E320 is 61.44Msps. You cannot represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which
they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the sampling
rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as well as
general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
https://kb.ettus.com/Knowledge_Base
And note the "Getting Started" here:
https://kb.ettus.com/E320_Getting_Started_Guide
------------------------------------------------------------------------
*From:* Hamdüsena BİLGİ (BİLGEM) via USRP-users
<usrp-users@lists.ettus.com> <mailto:usrp-users@lists.ettus.com>
*Sent:* Tuesday, December 24, 2024 9:10:39 AM
*To:* usrp-users <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Subject:* [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but
when I send 3 different signals I just see 1 signal frequency
domain at oscilloscope but I can see 3 different signal at qt guı
frequency sink.UHD usrp sink block just send center freq . And I
try sending with Python API but its note working too.How can
solve this problem ?
The images are attached.
Thanks
_______________________________________________
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
I am currently using E320 devices for my application. For both receive and transmit processes, I have attached a 50 dB attenuator. I am also attaching my flowgraph for your review.Additionally, my console output shows "UOOOUUU."
python code
Kimden: "Marcus D. Leech" patchvonbraun@gmail.com
Kime: "Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
Kk: "usrp-users" usrp-users@lists.ettus.com
Gönderilenler: 26 Aralık Perşembe 2024 20:53:46
Konu: Re: [USRP-users] Re: multi-tone signal establishing
On 26/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
Hi,
I followed your instructions and can see 3 different signals on the oscilloscope. However, I have a small issue. I set the following parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184 MHz. However, on the oscilloscope, I see them at 205 MHz, 201 MHz, and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can transmit and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
When you say "loopback in Gnu Radio" do you mean a loop-back within the flow-graph, without using the radio? Or an analog
loopback between TX/RX ports on the radio?
When you're using the flow-graph and transmitting from the USRP, do you see any "U" (under-runs) while transmitting?
How about when you're using your Python code?
BQ_BEGIN
Kimden: "Marcus D. Leech" [ mailto:patchvonbraun@gmail.com | patchvonbraun@gmail.com ]
Kime: "usrp-users" [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Gönderilenler: 25 Aralık Çarşamba 2024 20:11:29
Konu: [USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
BQ_BEGIN
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M Hz and send them with freq=150MHz carrier frequency . Your output signals should be at 250MHz, 400Mhz and 450Mhz. You should take mesaurements around these frequencies.
Best,
Ceren
BQ_END
Please read what I wrote on this subject earlier. The MAXimum sample-rate of the E320 is 61.44Msps. You cannot represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the sampling rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as well as general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
[ https://kb.ettus.com/Knowledge_Base | https://kb.ettus.com/Knowledge_Base ]
And note the "Getting Started" here:
[ https://kb.ettus.com/E320_Getting_Started_Guide | https://kb.ettus.com/E320_Getting_Started_Guide ]
BQ_BEGIN
From: Hamdüsena BİLGİ (BİLGEM) via USRP-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Sent: Tuesday, December 24, 2024 9:10:39 AM
To: usrp-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Subject: [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I send 3 different signals I just see 1 signal frequency domain at oscilloscope but I can see 3 different signal at qt guı frequency sink.UHD usrp sink block just send center freq . And I try sending with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ] To unsubscribe send an email to [ mailto:usrp-users-leave@lists.ettus.com | usrp-users-leave@lists.ettus.com ]
BQ_END
USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
To unsubscribe send an email to [ mailto:usrp-users-leave@lists.ettus.com | usrp-users-leave@lists.ettus.com ]
BQ_END
I am writing to provide an updated version of my Python code. I realized that the amplitude value in the previous code was incorrect, and I have now corrected it to 0.3.
Kimden: "Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
Kime: "Marcus D. Leech" patchvonbraun@gmail.com
Kk: "usrp-users" usrp-users@lists.ettus.com
Gönderilenler: 27 Aralık Cuma 2024 8:52:44
Konu: Re: [USRP-users] Re: multi-tone signal establishing
I am currently using E320 devices for my application. For both receive and transmit processes, I have attached a 50 dB attenuator. I am also attaching my flowgraph for your review.Additionally, my console output shows "UOOOUUU."
python code
Kimden: "Marcus D. Leech" patchvonbraun@gmail.com
Kime: "Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
Kk: "usrp-users" usrp-users@lists.ettus.com
Gönderilenler: 26 Aralık Perşembe 2024 20:53:46
Konu: Re: [USRP-users] Re: multi-tone signal establishing
On 26/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
Hi,
I followed your instructions and can see 3 different signals on the oscilloscope. However, I have a small issue. I set the following parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184 MHz. However, on the oscilloscope, I see them at 205 MHz, 201 MHz, and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can transmit and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
When you say "loopback in Gnu Radio" do you mean a loop-back within the flow-graph, without using the radio? Or an analog
loopback between TX/RX ports on the radio?
When you're using the flow-graph and transmitting from the USRP, do you see any "U" (under-runs) while transmitting?
How about when you're using your Python code?
BQ_BEGIN
Kimden: "Marcus D. Leech" [ mailto:patchvonbraun@gmail.com | patchvonbraun@gmail.com ]
Kime: "usrp-users" [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Gönderilenler: 25 Aralık Çarşamba 2024 20:11:29
Konu: [USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
BQ_BEGIN
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and 300M Hz and send them with freq=150MHz carrier frequency . Your output signals should be at 250MHz, 400Mhz and 450Mhz. You should take mesaurements around these frequencies.
Best,
Ceren
BQ_END
Please read what I wrote on this subject earlier. The MAXimum sample-rate of the E320 is 61.44Msps. You cannot represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the sampling rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as well as general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
[ https://kb.ettus.com/Knowledge_Base | https://kb.ettus.com/Knowledge_Base ]
And note the "Getting Started" here:
[ https://kb.ettus.com/E320_Getting_Started_Guide | https://kb.ettus.com/E320_Getting_Started_Guide ]
BQ_BEGIN
From: Hamdüsena BİLGİ (BİLGEM) via USRP-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Sent: Tuesday, December 24, 2024 9:10:39 AM
To: usrp-users [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
Subject: [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but when I send 3 different signals I just see 1 signal frequency domain at oscilloscope but I can see 3 different signal at qt guı frequency sink.UHD usrp sink block just send center freq . And I try sending with Python API but its note working too.How can solve this problem ?
The images are attached.
Thanks
USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ] To unsubscribe send an email to [ mailto:usrp-users-leave@lists.ettus.com | usrp-users-leave@lists.ettus.com ]
BQ_END
USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ]
To unsubscribe send an email to [ mailto:usrp-users-leave@lists.ettus.com | usrp-users-leave@lists.ettus.com ]
BQ_END
On 27/12/2024 00:52, Hamdüsena BİLGİ (BİLGEM) wrote:
I am currently using E320 devices for my application. For both receive
and transmit processes, I have attached a 50 dB attenuator. I am also
attaching my flowgraph for your review.Additionally, my console output
shows "UOOOUUU."
I assume that you're using the SFP+ port on the E320, with 10GiGabit
links? Because you cannot support 50Msps on a
1GiG interface.
If you're getting a lot of O and U, it means your computer cannot "keep
up" with the flow requirements of the radio.
python code
*Kimden: *"Marcus D. Leech" patchvonbraun@gmail.com
*Kime: *"Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
*Kk: *"usrp-users" usrp-users@lists.ettus.com
*Gönderilenler: *26 Aralık Perşembe 2024 20:53:46
*Konu: *Re: [USRP-users] Re: multi-tone signal establishing
On 26/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
Hi,
I followed your instructions and can see 3 different signals on
the oscilloscope. However, I have a small issue. I set the
following parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184
MHz. However, on the oscilloscope, I see them at 205 MHz, 201 MHz,
and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can
transmit and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
When you say "loopback in Gnu Radio" do you mean a loop-back within
the flow-graph, without using the radio? Or an analog
loopback between TX/RX ports on the radio?
When you're using the flow-graph and transmitting from the USRP, do
you see any "U" (under-runs) while transmitting?
How about when you're using your Python code?
------------------------------------------------------------------------
*Kimden: *"Marcus D. Leech" <patchvonbraun@gmail.com>
<mailto:patchvonbraun@gmail.com>
*Kime: *"usrp-users" <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Gönderilenler: *25 Aralık Çarşamba 2024 20:11:29
*Konu: *[USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and
300M Hz and send them with freq=150MHz _carrier frequency_.
Your output signals should be at 250MHz, 400Mhz and 450Mhz.
You should take mesaurements around these frequencies.
Best,
Ceren
Please read what I wrote on this subject earlier. The MAXimum
sample-rate of the E320 is 61.44Msps. You *cannot* represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which
they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the
sampling rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as
well as general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
https://kb.ettus.com/Knowledge_Base
And note the "Getting Started" here:
https://kb.ettus.com/E320_Getting_Started_Guide
------------------------------------------------------------------------
*From:* Hamdüsena BİLGİ (BİLGEM) via USRP-users
<usrp-users@lists.ettus.com> <mailto:usrp-users@lists.ettus.com>
*Sent:* Tuesday, December 24, 2024 9:10:39 AM
*To:* usrp-users <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Subject:* [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but
when I send 3 different signals I just see 1 signal frequency
domain at oscilloscope but I can see 3 different signal at qt
guı frequency sink.UHD usrp sink block just send center freq .
And I try sending with Python API but its note working
too.How can solve this problem ?
The images are attached.
Thanks
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On 27/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
I am writing to provide an updated version of my Python code. I
realized that the amplitude value in the previous code was incorrect,
and I have now corrected it to 0.3.
Have you actually plotted your sine waves, synthesized below, to make
sure that they make sense?
*Kimden: *"Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
*Kime: *"Marcus D. Leech" patchvonbraun@gmail.com
*Kk: *"usrp-users" usrp-users@lists.ettus.com
*Gönderilenler: *27 Aralık Cuma 2024 8:52:44
*Konu: *Re: [USRP-users] Re: multi-tone signal establishing
I am currently using E320 devices for my application. For both receive
and transmit processes, I have attached a 50 dB attenuator. I am also
attaching my flowgraph for your review.Additionally, my console output
shows "UOOOUUU."
python code
*Kimden: *"Marcus D. Leech" patchvonbraun@gmail.com
*Kime: *"Hamdüsena BİLGİ, BİLGEM" hamdusena.bilgi@tubitak.gov.tr
*Kk: *"usrp-users" usrp-users@lists.ettus.com
*Gönderilenler: *26 Aralık Perşembe 2024 20:53:46
*Konu: *Re: [USRP-users] Re: multi-tone signal establishing
On 26/12/2024 00:57, Hamdüsena BİLGİ (BİLGEM) wrote:
Hi,
I followed your instructions and can see 3 different signals on
the oscilloscope. However, I have a small issue. I set the
following parameters:
center_freq = 200 MHz
sample_rate = 50 MHz
frequency0 = 16 MHz
frequency1 = 4 MHz
frequency2 = -16 MHz
num_samples = 100000
I define the signals as:
t = np.arange(num_samples) / sample_rate
sine_wave0 = amplitude * np.exp(2j * np.pi * frequency0 * t)
sine_wave1 = amplitude * np.exp(2j * np.pi * frequency1 * t)
sine_wave2 = amplitude * np.exp(2j * np.pi * frequency2 * t)
sine_wave = sine_wave0 + sine_wave1 + sine_wave2
I expected to see the signals at around 216 MHz, 204 MHz, and 184
MHz. However, on the oscilloscope, I see them at 205 MHz, 201 MHz,
and 195 MHz.
When I test the same setup using loopback in GNU Radio, I can
transmit and receive all three signals correctly.
What could be causing this discrepancy?
Best regards,
When you say "loopback in Gnu Radio" do you mean a loop-back within
the flow-graph, without using the radio? Or an analog
loopback between TX/RX ports on the radio?
When you're using the flow-graph and transmitting from the USRP, do
you see any "U" (under-runs) while transmitting?
How about when you're using your Python code?
------------------------------------------------------------------------
*Kimden: *"Marcus D. Leech" <patchvonbraun@gmail.com>
<mailto:patchvonbraun@gmail.com>
*Kime: *"usrp-users" <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Gönderilenler: *25 Aralık Çarşamba 2024 20:11:29
*Konu: *[USRP-users] Re: multi-tone signal establishing
On 25/12/2024 01:31, Ceren Karaköse wrote:
Hi Hamdüsena,
What's your spectrum analyzer center frequency?
In GNU flow, you're generating 3 sinusoids at 100M, 250M and
300M Hz and send them with freq=150MHz _carrier frequency_.
Your output signals should be at 250MHz, 400Mhz and 450Mhz.
You should take mesaurements around these frequencies.
Best,
Ceren
Please read what I wrote on this subject earlier. The MAXimum
sample-rate of the E320 is 61.44Msps. You *cannot* represent
these signals within that sample rate.
SDRs in general expect to receive a complex-baseband stream, which
they then up-convert, using analog hardware to the
desired on-the-air frequency. So any frequencies fro
m things like the "Signal Generator" block would necessarily be
within the context of a complex baseband at whatever the
sampling rate is, and, again, the E320 will not move samples
at a rate faster than 61.44Msps.
I would suggest looking at more of the Gnu Radio tutorials, as
well as general background material on DSP and
complex-baseband signal representation.
Also, spend some time at the USRP Knowledge Base:
https://kb.ettus.com/Knowledge_Base
And note the "Getting Started" here:
https://kb.ettus.com/E320_Getting_Started_Guide
------------------------------------------------------------------------
*From:* Hamdüsena BİLGİ (BİLGEM) via USRP-users
<usrp-users@lists.ettus.com> <mailto:usrp-users@lists.ettus.com>
*Sent:* Tuesday, December 24, 2024 9:10:39 AM
*To:* usrp-users <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Subject:* [USRP-users] multi-tone signal establishing
Hi usrp users,
I use e320 devices and I want to create multi tone signal but
when I send 3 different signals I just see 1 signal frequency
domain at oscilloscope but I can see 3 different signal at qt
guı frequency sink.UHD usrp sink block just send center freq .
And I try sending with Python API but its note working
too.How can solve this problem ?
The images are attached.
Thanks
_______________________________________________
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com
_______________________________________________
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
