I
>>> guess) and there will be a lot of garbage in the sent spectrum.
>>>
>>>
>>>
>>> Cheers,
>>>
>>> Jonas
>>>
>>>
>>>
>>> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jonas.manthey=
>
>> Cheers,
>>
>> Jonas
>>
>>
>>
>> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jonas.manthey=
>> u-blox@gnu.org] *On Behalf Of *Simona Sibio
>> *Sent:* Donnerstag, 18. Juli 2019 13:01
>> *To:* Kyeong Su Shin
>> *Cc
[mailto:discuss-gnuradio-bounces+jonas.manthey=
> u-blox@gnu.org] *On Behalf Of *Simona Sibio
> *Sent:* Donnerstag, 18. Juli 2019 13:01
> *To:* Kyeong Su Shin
> *Cc:* discuss-gnuradio@gnu.org
> *Subject:* Re: [Discuss-gnuradio] USRP GNU radio receiver
>
>
>
> Hi Kyeong
lot of garbage in the sent spectrum.
>
>
>
> Cheers,
>
> Jonas
>
>
>
> *From:* Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jonas.manthey=
> u-blox@gnu.org] *On Behalf Of *Simona Sibio
> *Sent:* Donnerstag, 18. Juli 2019 13:01
> *To:* Kyeong Su Shin
> *Cc
,
Jonas
From: Discuss-gnuradio
[mailto:discuss-gnuradio-bounces+jonas.manthey=u-blox@gnu.org] On Behalf Of
Simona Sibio
Sent: Donnerstag, 18. Juli 2019 13:01
To: Kyeong Su Shin
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] USRP GNU radio receiver
Hi Kyeong,
I attached the
ed, throttle blocks _must_ be removed.
Regards,
Kyeong Su Shin
보낸 사람: Simona Sibio 대신 Discuss-gnuradio
보낸 날짜: 2019년 7월 17일 수요일 오후 11:35:00
받는 사람: Müller, Marcus (CEL)
참조: discuss-gnuradio@gnu.org
제목: Re: [Discuss-gnuradio] USRP GNU radio receiver
Thank you
Thank you very much!
I sent the screenshot because in the oscilloscope there is not the offset.
Instead, I would like to detect that.
Thank you in advance.
Simona
Il giorno mer 17 lug 2019 alle ore 15:22 Müller, Marcus (CEL) <
muel...@kit.edu> ha scritto:
> 1. Never use a throttle with a hardwar
1. Never use a throttle with a hardware block. GRC's log will actually
shout at you that you shouldn't be doing that!
2. I must admit this is about as good as I'd expect. I of course can't
infer temporal behaviour from screenshots.
Best regards,
Marcus
On Wed, 2019-07-17 at 14:18 +0100, Simona Si
That phase is not any more or less random than that of your local
oscillator, so there might be some misunderstanding here.
On Tue, 2019-07-16 at 18:52 +0100, Simona Sibio wrote:
> Thank you very much!
> But, with the offset tuning I cannot edit the phase.
> Maybe, I have to change method.
> Best R
Thank you very much!!
Then, I cannot measure a constant because, in the RX chain, maybe, some
filter deletes the information, doesn't it?
Thank you for your time and tour tips!
Best Regards,
Simona
Il giorno mar 16 lug 2019 alle ore 18:01 Müller, Marcus (CEL) <
muel...@kit.edu> ha scritto:
> Lo
Look up what a quadrature modulator does. It's just a multiplication
with e^{j2\pi f_{carrier}t}, in the end.
Your constant signal s(t) = c const. would hence be transmitted as
c·e^{j2\pi f_{carrier}t}
whereas a complex sinusoid of frequency f and amplitude a,
s(t) = a·e^{j2\pi f t) would be tra
Hi Marcus,
Thank you for tip!
I know that calibration is not so easy but I hope that.
Could you help me to understand what happened with a constant complex
baseband signal?
I am beginner in this field.
Thank you for your time.
Best Regards,
Simona
Il giorno mar 16 lug 2019 alle ore 17:39 Müller
Ettus USRPs are not calibrated measurement devices, so be a bit careful
with actually measuring power with them: you'll need to calibrate
things yourself for every sample rate, carrier frequency, antenna,
temperature … combination.
Best regards,
Marcus
On Tue, 2019-07-16 at 17:37 +0100, Simona Si
Watch out! What do you get at the *output* of your SDR device when you
transmit a constant complex baseband signal, mixed to a carrier
frequency? How does that differ from transmitting a complex baseband
sinusoid mixed to a carrier frequency?
On Tue, 2019-07-16 at 18:32 +0200, sumit kumar wrote:
>
Hi Marcus and Sumit,
Thank you for the answer.
I tried with different sampling rate until 5M.
And I connected the spectrum analyzer to measure the power.
Practically, I would like to measure the power also in the receiver.
Best Regards,
Simona
Il giorno mar 16 lug 2019 alle ore 17:20 Müller, Mar
Ok, so for a constant source, in the time domain you will see a flat signal
only! Try connecting a spectrum analyzer and you shud see a peak at DC becz
Fourier transform of constant signal is impulse.
And yes, as Marcus said, increase the sampling rate!
[image: Screenshot from 2019-07-16 18-29-17.p
Hi Simona,
* think about what you're *actually* transmitting in bandpass when you
have a constant baseband
* A USRP still can't be used at a sampling rate of 32 kS/s and will
most definitely complain about that. Use a higher rate.
Best regards,
Marcus
On Tue, 2019-07-16 at 17:05 +0100, Simona Si
Hi Simona, what is the "constant signal" here ?
On Tue, 16 Jul 2019 at 17:54, Simona Sibio wrote:
> Hi all,
>
> I want to use GNU radio to measure the amplitude and the phase of a signal.
> I send a constant signal with the transmitter USRP but in the receiver
> there is a flat signal with ampli
Hi all,
I want to use GNU radio to measure the amplitude and the phase of a signal.
I send a constant signal with the transmitter USRP but in the receiver
there is a flat signal with amplitude 0 and offset 0.
I tried to send a sine signal and the receveir works fine.
How can I do to send only a co
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