Re: [USRP-users] Incorrect data from usrp 2955

2020-09-02 Thread Koyel Das (Vehere) via USRP-users 
Hi Marcus,

Just an update. One cable was faulty and not the usrp.

Regards,
Koyel

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From: Koyel Das (Vehere) 
Sent: Friday, August 21, 2020 9:26:16 PM
To: Marcus D. Leech ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

Ok thanks. I will then generate a tone and see the amplitude  and if any 
distortion on the received signal.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Friday, August 21, 2020 9:18:29 PM
To: Koyel Das (Vehere) ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/21/2020 08:47 AM, Koyel Das (Vehere) wrote:
Hi Marcus,

In order to see if single channel of usrp is giving correct phase, I will 
transmit a qpsk signal using one usrp and receive using the usrp under test. 
The qpsk signal should appear same in receiver as in transmitter and that will 
confirm if single channel is working fine. Attached is the flowgraph for qpsk 
signal generator. I have a doubt that “Random Source” block is not accepting 
any datatype other than “byte” else the connection is getting red and “USRP 
Sink” is not accepting anything other than “complex float”. In between is the 
“Constellation Modulator” block. The connections are showing compatible (please 
refer the attached flowgraph). Perhaps "Constellation Modulator" is sending out 
data as "complex float" to "USRP Sink" otherwise how can the two blocks be 
compatible?

So can I expect usrp sink will get correct data and not deform the data out of 
“Constellation Modulator” to some incorrect data, since "Random Source" is 
sending "Byte" and "USRP Sink" is receiving "complex float"? Means is the 
flowgraph correct taking all datatypes into consideration?

I am also attaching the grc files of transmitter and receiver.

Regards,
Koyel

Neither of your attached .grc files have anything useful in them...

When I said "check sanity of individual channels", I wasn't concerned with 
phase--only that they were grossly "sane".  When you inject
  a signal in to them, do the resulting signals have the correct attributes?  
Is the SNR roughly correct, etc?


Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Koyel Das (Vehere) via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Monday, August 17, 2020 10:07:05 AM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

Ok Marcus I will try to figure out if individual channels are working fine.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:52 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 01:15 PM, Koyel Das (Vehere) wrote:
I am not observing one individual channel but phase difference between two 
channels. I very well know individual channel would show random phases but not 
the phase difference when same signal is injected in two channels. I hope you 
are aware that phase difference = 2pi/lambda* path_difference. Path difference 
is constant as that’s the difference between two paths of two daughterboards 
and hence this phase difference is constant. Remember same signal is injected 
so initial phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant

Get Outlook for iOS<https://aka.ms/o0ukef>
Yes, I fully understand that.  I'm simply suggesting some simple diagnostics to 
determine whether, as individual channels, the receivers are
  working correctly.



From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:39 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between two 
channels

Get Outlook for iOS<https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the X310?

If you observe an individual channel, is it "sane" ?  That is, apparently 
on-frequency, and with correct amplitudes and low distortion?



From: Koyel Das (Vehere) <mailto:koyel@vehere.com>
Sent: Sunday, August 16,

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-21 Thread Koyel Das (Vehere) via USRP-users 
Ok thanks. I will then generate a tone and see the amplitude  and if any 
distortion on the received signal.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Friday, August 21, 2020 9:18:29 PM
To: Koyel Das (Vehere) ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/21/2020 08:47 AM, Koyel Das (Vehere) wrote:
Hi Marcus,

In order to see if single channel of usrp is giving correct phase, I will 
transmit a qpsk signal using one usrp and receive using the usrp under test. 
The qpsk signal should appear same in receiver as in transmitter and that will 
confirm if single channel is working fine. Attached is the flowgraph for qpsk 
signal generator. I have a doubt that “Random Source” block is not accepting 
any datatype other than “byte” else the connection is getting red and “USRP 
Sink” is not accepting anything other than “complex float”. In between is the 
“Constellation Modulator” block. The connections are showing compatible (please 
refer the attached flowgraph). Perhaps "Constellation Modulator" is sending out 
data as "complex float" to "USRP Sink" otherwise how can the two blocks be 
compatible?

So can I expect usrp sink will get correct data and not deform the data out of 
“Constellation Modulator” to some incorrect data, since "Random Source" is 
sending "Byte" and "USRP Sink" is receiving "complex float"? Means is the 
flowgraph correct taking all datatypes into consideration?

I am also attaching the grc files of transmitter and receiver.

Regards,
Koyel

Neither of your attached .grc files have anything useful in them...

When I said "check sanity of individual channels", I wasn't concerned with 
phase--only that they were grossly "sane".  When you inject
  a signal in to them, do the resulting signals have the correct attributes?  
Is the SNR roughly correct, etc?


Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Koyel Das (Vehere) via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Monday, August 17, 2020 10:07:05 AM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

Ok Marcus I will try to figure out if individual channels are working fine.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:52 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 01:15 PM, Koyel Das (Vehere) wrote:
I am not observing one individual channel but phase difference between two 
channels. I very well know individual channel would show random phases but not 
the phase difference when same signal is injected in two channels. I hope you 
are aware that phase difference = 2pi/lambda* path_difference. Path difference 
is constant as that’s the difference between two paths of two daughterboards 
and hence this phase difference is constant. Remember same signal is injected 
so initial phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant

Get Outlook for iOS<https://aka.ms/o0ukef>
Yes, I fully understand that.  I'm simply suggesting some simple diagnostics to 
determine whether, as individual channels, the receivers are
  working correctly.



From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:39 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between two 
channels

Get Outlook for iOS<https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the X310?

If you observe an individual channel, is it "sane" ?  That is, apparently 
on-frequency, and with correct amplitudes and low distortion?



From: Koyel Das (Vehere) <mailto:koyel@vehere.com>
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measu

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-21 Thread Marcus D. Leech via USRP-users 

On 08/21/2020 08:47 AM, Koyel Das (Vehere) wrote:

Hi Marcus,

In order to see if single channel of usrp is giving correct phase, I 
will transmit a qpsk signal using one usrp and receive using the usrp 
under test. The qpsk signal should appear same in receiver as in 
transmitter and that will confirm if single channel is working fine. 
Attached is the flowgraph for qpsk signal generator. I have a doubt 
that “Random Source” block is not accepting any datatype other than 
“byte” else the connection is getting red and “USRP Sink” is not 
accepting anything other than “complex float”. In between is the 
“Constellation Modulator” block. The connections are showing 
compatible (please refer the attached flowgraph). Perhaps 
"Constellation Modulator" is sending out data as "complex float" to 
"USRP Sink" otherwise how can the two blocks be compatible?


So can I expect usrp sink will get correct data and not deform the 
data out of “Constellation Modulator” to some incorrect data, since 
"Random Source" is sending "Byte" and "USRP Sink" is receiving 
"complex float"? Means is the flowgraph correct taking all datatypes 
into consideration?


I am also attaching the grc files of transmitter and receiver.

Regards,
Koyel


Neither of your attached .grc files have anything useful in them...

When I said "check sanity of individual channels", I wasn't concerned 
with phase--only that they were grossly "sane".  When you inject
  a signal in to them, do the resulting signals have the correct 
attributes?  Is the SNR roughly correct, etc?




Get Outlook for iOS <https://aka.ms/o0ukef>

*From:* USRP-users  on behalf of 
Koyel Das (Vehere) via USRP-users 

*Sent:* Monday, August 17, 2020 10:07:05 AM
*To:* Marcus D. Leech ; 
usrp-users@lists.ettus.com 

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
Ok Marcus I will try to figure out if individual channels are working 
fine.


Regards,
Koyel

Get Outlook for iOS <https://aka.ms/o0ukef>

*From:* Marcus D. Leech 
*Sent:* Sunday, August 16, 2020 10:52 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/16/2020 01:15 PM, Koyel Das (Vehere) wrote:
I am not observing one individual channel but phase difference 
between two channels. I very well know individual channel would show 
random phases but not the phase difference when same signal is 
injected in two channels. I hope you are aware that phase difference 
= 2pi/lambda* path_difference. Path difference is constant as that’s 
the difference between two paths of two daughterboards and hence this 
phase difference is constant. Remember same signal is injected so 
initial phases would be same for two channels and only the difference 
in the signal path lengths bring the difference which is constant


Get Outlook for iOS <https://aka.ms/o0ukef>
Yes, I fully understand that.  I'm simply suggesting some simple 
diagnostics to determine whether, as individual channels, the 
receivers are

  working correctly.




*From:* Marcus D. Leech  
<mailto:patchvonbr...@gmail.com>

*Sent:* Sunday, August 16, 2020 10:39 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com 
<mailto:usrp-users@lists.ettus.com>

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference 
between two channels


Get Outlook for iOS <https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in 
the X310?


If you observe an individual channel, is it "sane" ? That is, 
apparently on-frequency, and with correct amplitudes and low distortion?





*From:* Koyel Das (Vehere)  
<mailto:koyel@vehere.com>

*Sent:* Sunday, August 16, 2020 10:15:48 PM
*To:* Marcus D. Leech  
<mailto:patchvonbr...@gmail.com>; usrp-users@lists.ettus.com 
<mailto:usrp-users@lists.ettus.com>  
<mailto:usrp-users@lists.ettus.com>

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
the phase difference between two channels of USRP as a function of 
frequency and time, when measured by splitting the same signal and 
feeding two channels of usrp, are wandering around wrt one another 
which was not happening before. I had given demo more than 30 times 
based on this principle and tested previously more than 50 times and 
I got correct result every time. Now only suddenly it started 
happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz 
to 100 MHz. Previously the whole bandwidth was showing similar 
values

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
Ok Marcus I will try to figure out if individual channels are working fine.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:52 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 01:15 PM, Koyel Das (Vehere) wrote:
I am not observing one individual channel but phase difference between two 
channels. I very well know individual channel would show random phases but not 
the phase difference when same signal is injected in two channels. I hope you 
are aware that phase difference = 2pi/lambda* path_difference. Path difference 
is constant as that’s the difference between two paths of two daughterboards 
and hence this phase difference is constant. Remember same signal is injected 
so initial phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant

Get Outlook for iOS<https://aka.ms/o0ukef>
Yes, I fully understand that.  I'm simply suggesting some simple diagnostics to 
determine whether, as individual channels, the receivers are
  working correctly.



From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:39 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between two 
channels

Get Outlook for iOS<https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the X310?

If you observe an individual channel, is it "sane" ?  That is, apparently 
on-frequency, and with correct amplitudes and low distortion?



From: Koyel Das (Vehere) <mailto:koyel@vehere.com>
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damage

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
I am using internal reference and I have not checked individual channel yet

Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users  on behalf of Koyel Das 
(Vehere) via USRP-users 
Sent: Sunday, August 16, 2020 10:45:56 PM
To: Marcus D. Leech ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

I am not observing one individual channel but phase difference between two 
channels. I very well know individual channel would show random phases but not 
the phase difference when same signal is injected in two channels. I hope you 
are aware that phase difference = 2pi/lambda* path_difference. Path difference 
is constant as that’s the difference between two paths of two daughterboards 
and hence this phase difference is constant. Remember same signal is injected 
so initial phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant

Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:39 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between two 
channels

Get Outlook for iOS<https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the X310?

If you observe an individual channel, is it "sane" ?  That is, apparently 
on-frequency, and with correct amplitudes and low distortion?



From: Koyel Das (Vehere) <mailto:koyel@vehere.com>
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Marcus D. Leech via USRP-users 

On 08/16/2020 01:15 PM, Koyel Das (Vehere) wrote:
I am not observing one individual channel but phase difference between 
two channels. I very well know individual channel would show random 
phases but not the phase difference when same signal is injected in 
two channels. I hope you are aware that phase difference = 2pi/lambda* 
path_difference. Path difference is constant as that’s the difference 
between two paths of two daughterboards and hence this phase 
difference is constant. Remember same signal is injected so initial 
phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant


Get Outlook for iOS <https://aka.ms/o0ukef>
Yes, I fully understand that.  I'm simply suggesting some simple 
diagnostics to determine whether, as individual channels, the receivers are

  working correctly.




*From:* Marcus D. Leech 
*Sent:* Sunday, August 16, 2020 10:39 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between 
two channels


Get Outlook for iOS <https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in 
the X310?


If you observe an individual channel, is it "sane" ?  That is, 
apparently on-frequency, and with correct amplitudes and low distortion?





*From:* Koyel Das (Vehere) 
*Sent:* Sunday, August 16, 2020 10:15:48 PM
*To:* Marcus D. Leech ; 
usrp-users@lists.ettus.com 

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
the phase difference between two channels of USRP as a function of 
frequency and time,  when measured by splitting the same signal and 
feeding two channels of usrp, are wandering around wrt one another 
which was not happening before. I had given demo more than 30 times 
based on this principle and tested previously more than 50 times and 
I got correct result every time. Now only suddenly it started 
happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz 
to 100 MHz. Previously the whole bandwidth was showing similar values 
but then suddenly started behaving abnormally giving near to correct 
result sometimes and sometimes junk.


Regards,
Koyel
Get Outlook for iOS <https://aka.ms/o0ukef>

*From:* Marcus D. Leech 
*Sent:* Sunday, August 16, 2020 10:05 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the 
phase differences are closeby but not so same as we were getting 
before and most of the times they are totally incorrect. Strength of 
the signal when we tried with maximum gain was near -40 dbm.


Regards,
Koyel

To clarify some things.

(A) The phase errors are just the initial phases--they don't wander 
around with respect to one another during a run?

(B) What frequency range?




Get Outlook for iOS <https://aka.ms/o0ukef>

*From:* USRP-users  
<mailto:usrp-users-boun...@lists.ettus.com> on behalf of Marcus D. 
Leech via USRP-users  
<mailto:usrp-users@lists.ettus.com>

*Sent:* Sunday, August 16, 2020 12:25:37 AM
*To:* usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com> 
 <mailto:usrp-users@lists.ettus.com>

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:

Hi,

We are using USRP 2955. Something has gone wrong. Before we were 
getting constant phase difference across channels for limited 
bandwidth and with time when we split single antenna signal using 
splitter and fed two channels of USRP but now it is not doing so. 
This happened on Friday that after getting a series of correct 
results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to 
receive wrong data: random phase  across channels and with time 
using the same setup with splitter. The thing we did was setting 
gain to near maximum and receiving 100 MHz sample rate. But I don't 
think amplifier has damaged because in this usrp we have four 
independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP 
is streaming data but phases are wrong? What do you think? Please 
let me know.


Regards,
Koyel

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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
I am not observing one individual channel but phase difference between two 
channels. I very well know individual channel would show random phases but not 
the phase difference when same signal is injected in two channels. I hope you 
are aware that phase difference = 2pi/lambda* path_difference. Path difference 
is constant as that’s the difference between two paths of two daughterboards 
and hence this phase difference is constant. Remember same signal is injected 
so initial phases would be same for two channels and only the difference in the 
signal path lengths bring the difference which is constant

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From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:39 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between two 
channels

Get Outlook for iOS<https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the X310?

If you observe an individual channel, is it "sane" ?  That is, apparently 
on-frequency, and with correct amplitudes and low distortion?



From: Koyel Das (Vehere) <mailto:koyel@vehere.com>
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech <mailto:patchvonbr...@gmail.com>; 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech <mailto:patchvonbr...@gmail.com>
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); 
usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



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From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>



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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?

Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Marcus D. Leech via USRP-users 

On 08/16/2020 12:46 PM, Koyel Das (Vehere) wrote:
The measurement is not initial phase but the phase difference between 
two channels


Get Outlook for iOS <https://aka.ms/o0ukef>
Are you using an external reference, or using the internal clock in the 
X310?


If you observe an individual channel, is it "sane" ?  That is, 
apparently on-frequency, and with correct amplitudes and low distortion?





*From:* Koyel Das (Vehere) 
*Sent:* Sunday, August 16, 2020 10:15:48 PM
*To:* Marcus D. Leech ; 
usrp-users@lists.ettus.com 

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
the phase difference between two channels of USRP as a function of 
frequency and time,  when measured by splitting the same signal and 
feeding two channels of usrp, are wandering around wrt one another 
which was not happening before. I had given demo more than 30 times 
based on this principle and tested previously more than 50 times and I 
got correct result every time. Now only suddenly it started happening. 
The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 100 MHz. 
Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result 
sometimes and sometimes junk.


Regards,
Koyel
Get Outlook for iOS <https://aka.ms/o0ukef>

*From:* Marcus D. Leech 
*Sent:* Sunday, August 16, 2020 10:05 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the 
phase differences are closeby but not so same as we were getting 
before and most of the times they are totally incorrect. Strength of 
the signal when we tried with maximum gain was near -40 dbm.


Regards,
Koyel

To clarify some things.

(A) The phase errors are just the initial phases--they don't wander 
around with respect to one another during a run?

(B) What frequency range?




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*From:* USRP-users  
<mailto:usrp-users-boun...@lists.ettus.com> on behalf of Marcus D. 
Leech via USRP-users  
<mailto:usrp-users@lists.ettus.com>

*Sent:* Sunday, August 16, 2020 12:25:37 AM
*To:* usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com> 
 <mailto:usrp-users@lists.ettus.com>

*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:

Hi,

We are using USRP 2955. Something has gone wrong. Before we were 
getting constant phase difference across channels for limited 
bandwidth and with time when we split single antenna signal using 
splitter and fed two channels of USRP but now it is not doing so. 
This happened on Friday that after getting a series of correct 
results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to 
receive wrong data: random phase  across channels and with time 
using the same setup with splitter. The thing we did was setting 
gain to near maximum and receiving 100 MHz sample rate. But I don't 
think amplifier has damaged because in this usrp we have four 
independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is 
streaming data but phases are wrong? What do you think? Please let 
me know.


Regards,
Koyel

Get Outlook for iOS <https://aka.ms/o0ukef>


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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?






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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
If you want I can send you the matlab code. You just have to capture two 
channels of usrp better with grc and save those as .bin files. Then you can run 
my matlab code. You just have to change the file names in the code with the 
names that you give in your .bin files. You should be getting same phase 
differences across frequency and channels and the values are stored in one 
vector in the code that you can see

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From: USRP-users  on behalf of Koyel Das 
(Vehere) via USRP-users 
Sent: Sunday, August 16, 2020 10:16:54 PM
To: Marcus D. Leech ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

The measurement is not initial phase but the phase difference between two 
channels

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From: Koyel Das (Vehere) 
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>



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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?



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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
The measurement is not initial phase but the phase difference between two 
channels

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From: Koyel Das (Vehere) 
Sent: Sunday, August 16, 2020 10:15:48 PM
To: Marcus D. Leech ; usrp-users@lists.ettus.com 

Subject: Re: [USRP-users] Incorrect data from usrp 2955

the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>



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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?



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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Koyel Das (Vehere) via USRP-users 
the phase difference between two channels of USRP as a function of frequency 
and time,  when measured by splitting the same signal and feeding two channels 
of usrp, are wandering around wrt one another which was not happening before. I 
had given demo more than 30 times based on this principle and tested previously 
more than 50 times and I got correct result every time. Now only suddenly it 
started happening. The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 
100 MHz. Previously the whole bandwidth was showing similar values but then 
suddenly started behaving abnormally giving near to correct result sometimes 
and sometimes junk.

Regards,
Koyel
Get Outlook for iOS<https://aka.ms/o0ukef>

From: Marcus D. Leech 
Sent: Sunday, August 16, 2020 10:05 PM
To: Koyel Das (Vehere); usrp-users@lists.ettus.com
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel
To clarify some things.

(A) The phase errors are just the initial phases--they don't wander around with 
respect to one another during a run?
(B) What frequency range?



Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users 
<mailto:usrp-users-boun...@lists.ettus.com> 
on behalf of Marcus D. Leech via USRP-users 
<mailto:usrp-users@lists.ettus.com>
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> 
<mailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>



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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?



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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-16 Thread Marcus D. Leech via USRP-users 

On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the 
phase differences are closeby but not so same as we were getting 
before and most of the times they are totally incorrect. Strength of 
the signal when we tried with maximum gain was near -40 dbm.


Regards,
Koyel

To clarify some things.

(A) The phase errors are just the initial phases--they don't wander 
around with respect to one another during a run?

(B) What frequency range?




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*From:* USRP-users  on behalf of 
Marcus D. Leech via USRP-users 

*Sent:* Sunday, August 16, 2020 12:25:37 AM
*To:* usrp-users@lists.ettus.com 
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:

Hi,

We are using USRP 2955. Something has gone wrong. Before we were 
getting constant phase difference across channels for limited 
bandwidth and with time when we split single antenna signal using 
splitter and fed two channels of USRP but now it is not doing so. 
This happened on Friday that after getting a series of correct 
results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to 
receive wrong data: random phase  across channels and with time using 
the same setup with splitter. The thing we did was setting gain to 
near maximum and receiving 100 MHz sample rate. But I don't think 
amplifier has damaged because in this usrp we have four independent 
channels and when we connected the splitter to unused channels then 
also we got wrong data. What can go wrong that USRP is streaming data 
but phases are wrong? What do you think? Please let me know.


Regards,
Koyel

Get Outlook for iOS <https://aka.ms/o0ukef>


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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?




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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-15 Thread Koyel Das (Vehere) via USRP-users 
No it doesn’t look better again after reducing gain. Sometimes the phase 
differences are closeby but not so same as we were getting before and most of 
the times they are totally incorrect. Strength of the signal when we tried with 
maximum gain was near -40 dbm.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>

From: USRP-users  on behalf of Marcus D. 
Leech via USRP-users 
Sent: Sunday, August 16, 2020 12:25:37 AM
To: usrp-users@lists.ettus.com 
Subject: Re: [USRP-users] Incorrect data from usrp 2955

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,

We are using USRP 2955. Something has gone wrong. Before we were getting 
constant phase difference across channels for limited bandwidth and with time 
when we split single antenna signal using splitter and fed two channels of USRP 
but now it is not doing so. This happened on Friday that after getting a series 
of correct results : constant phase difference across channels by feeding 
signal using splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup with 
splitter. The thing we did was setting gain to near maximum and receiving 100 
MHz sample rate. But I don't think amplifier has damaged because in this usrp 
we have four independent channels and when we connected the splitter to unused 
channels then also we got wrong data. What can go wrong that USRP is streaming 
data but phases are wrong? What do you think? Please let me know.

Regards,
Koyel

Get Outlook for iOS<https://aka.ms/o0ukef>



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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?


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Re: [USRP-users] Incorrect data from usrp 2955

2020-08-15 Thread Marcus D. Leech via USRP-users 

On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:

Hi,

We are using USRP 2955. Something has gone wrong. Before we were 
getting constant phase difference across channels for limited 
bandwidth and with time when we split single antenna signal using 
splitter and fed two channels of USRP but now it is not doing so. This 
happened on Friday that after getting a series of correct results : 
constant phase difference across channels by feeding signal using 
splitter as mentioned above, we suddenly started to receive wrong 
data: random phase  across channels and with time using the same setup 
with splitter. The thing we did was setting gain to near maximum and 
receiving 100 MHz sample rate. But I don't think amplifier has damaged 
because in this usrp we have four independent channels and when we 
connected the splitter to unused channels then also we got wrong data. 
What can go wrong that USRP is streaming data but phases are wrong? 
What do you think? Please let me know.


Regards,
Koyel

Get Outlook for iOS 


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Does it look better again when you reduce the gain?

What is the magnitude of the signals going to the RX ports?


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