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Today's Topics:
1. Re: USRP SBX daughter board (Balint Seeber)
2. Re: USRP SBX daughter board (Usrp IITM)
3. Re: Differences between WBX rev 2.0 and 3.0 (Balint Seeber)
4. Re: Differences between WBX rev 2.0 and 3.0 (John Malsbury)
5. how many lost samples ? (raboteauo)
6. how to Implement message passing (Juan Daniel Fernandez Martinez)
7. Re: USRP SBX daughter board (Usrp IITM)
8. Re: USRP SBX daughter board (Bastian Bloessl)
9. Re: USRP SBX daughter board (Usrp IITM)
----------------------------------------------------------------------
Message: 1
Date: Tue, 18 Dec 2012 09:47:59 -0800
From: Balint Seeber <[email protected]>
To: Usrp IITM <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] USRP SBX daughter board
Message-ID:
<CAPcb_2o-qiA1_dq=B=7v1v3bcbjy4hbwztnupcw62tsmthv...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi RK,
A few questions to help narrow down the issue:
1. Did you run the calibration utilities on the TX side? (RX side would
probably be beneficial too.)
http://files.ettus.com/uhd_docs/manual/html/calibration.html
Results are stored and selected per daughterboard, so keep that in mind
when swapping between the two.
2. Have you had a look at the spectrum when you applied small shifts in
the TX centre frequency? Does that spur move consistently with the rest of
the OFDM signal? (The odd thing is that it's slightly offset to the left of
centre between the two OFDM carriers...)
Balint
On Tue, Dec 18, 2012 at 3:32 AM, Usrp IITM <[email protected]> wrote:
> Hi Matt,
>
> We are able to see the spectrum now. There was some small bug.
>
> However the carrier is being transmitted by the SBX board. We have a
> transmit filter that has a notch at DC, so technically the data has no DC
> component (before being sent to the USRP). The carrier is absent when we
> use the RFX2400 board to transmit. We are using a centre frequency of 2.49
> Ghz and receiving with an RFX2400 board. Please see the attached pictures.
>
> RFX2400 TX
> [image: Inline image 1]
>
> *SBX* *TX*
>
> [image: Inline image 2]
> Any suggestion as to why this is happening?
>
> -Regards
> RK
>
> On Tue, Dec 18, 2012 at 1:03 PM, Matt Ettus <[email protected]> wrote:
>
>>
>> The SBX has controllable gain on TX as well as RX. How did you set the
>> gain? Are you able to see anything on an FFT display?
>>
>> Matt
>>
>>
>> On Thu, Dec 13, 2012 at 11:12 PM, Usrp IITM <[email protected]>wrote:
>>
>>> We are trying to implement OFDM point to point link using USRPN210. The
>>> frequency used is 2.49GHz. When we used RFX2400 daughter board in
>>> transmitter ,it works for rate of 5MHz for a Rx gain of 40dB-50dB. But when
>>> we use SBX daughter board(which has variable transmit gain), it doesn't
>>> work for 5 MHz rate.We can't even see a spectrum in the reciever.Can
>>> someone explain how to adjust the gain for different rates and all other
>>> specifications of SBX daughterboard.
>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing list
>>> [email protected]
>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>
>>>
>>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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------------------------------
Message: 2
Date: Tue, 18 Dec 2012 23:54:34 +0530
From: Usrp IITM <[email protected]>
To: Balint Seeber <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] USRP SBX daughter board
Message-ID:
<CAPkh=_-fUa48ugSb+tc1JXeJQJiuvpTsKR7igV=3fzfkunh...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
On Tue, Dec 18, 2012 at 11:17 PM, Balint Seeber <[email protected]>wrote:
> Hi RK,
>
> A few questions to help narrow down the issue:
>
> 1. Did you run the calibration utilities on the TX side? (RX side
> would probably be beneficial too.)
> http://files.ettus.com/uhd_docs/manual/html/calibration.html
> Results are stored and selected per daughterboard, so keep that in
> mind when swapping between the two.
>
> We ran the calibration tests for both the transmitter and the receiver.
>
> 1. Have you had a look at the spectrum when you applied small shifts
> in the TX centre frequency? Does that spur move consistently with the rest
> of the OFDM signal? (The odd thing is that it's slightly offset to the left
> of centre between the two OFDM carriers...)
>
> I observed it too, I have to check this. Will post the results in the
morning. BTW,
> Balint
>
>
> On Tue, Dec 18, 2012 at 3:32 AM, Usrp IITM <[email protected]>wrote:
>
>> Hi Matt,
>>
>> We are able to see the spectrum now. There was some small bug.
>>
>> However the carrier is being transmitted by the SBX board. We have a
>> transmit filter that has a notch at DC, so technically the data has no DC
>> component (before being sent to the USRP). The carrier is absent when we
>> use the RFX2400 board to transmit. We are using a centre frequency of 2.49
>> Ghz and receiving with an RFX2400 board. Please see the attached pictures.
>>
>> RFX2400 TX
>> [image: Inline image 1]
>>
>> *SBX* *TX*
>>
>> [image: Inline image 2]
>> Any suggestion as to why this is happening?
>>
>> -Regards
>> RK
>>
>> On Tue, Dec 18, 2012 at 1:03 PM, Matt Ettus <[email protected]> wrote:
>>
>>>
>>> The SBX has controllable gain on TX as well as RX. How did you set the
>>> gain? Are you able to see anything on an FFT display?
>>>
>>> Matt
>>>
>>>
>>> On Thu, Dec 13, 2012 at 11:12 PM, Usrp IITM
>>> <[email protected]>wrote:
>>>
>>>> We are trying to implement OFDM point to point link using USRPN210.
>>>> The frequency used is 2.49GHz. When we used RFX2400 daughter board in
>>>> transmitter ,it works for rate of 5MHz for a Rx gain of 40dB-50dB. But when
>>>> we use SBX daughter board(which has variable transmit gain), it doesn't
>>>> work for 5 MHz rate.We can't even see a spectrum in the reciever.Can
>>>> someone explain how to adjust the gain for different rates and all other
>>>> specifications of SBX daughterboard.
>>>>
>>>>
>>>> _______________________________________________
>>>> USRP-users mailing list
>>>> [email protected]
>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>>
>>>>
>>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>
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------------------------------
Message: 3
Date: Tue, 18 Dec 2012 11:37:28 -0800
From: Balint Seeber <[email protected]>
To: Stefano Speretta <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Differences between WBX rev 2.0 and 3.0
Message-ID:
<CAPcb_2pJy5KHXQOYOZiHsJiwpv62nczqJYR+CFOW=etp0du...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Stefano,
You are correct: io_tx_14 is taken to that new IC, which as you guessed is
a digitally-controlled attenuator.
Apart from adding that chip, the only other change is the preceding
quadrature modulator IC was changed to a version without an internal
attenuator.
The remaining io_tx[13:8] GPIO lines should still be available for your use.
Let me know if you require any more info.
Kind regards,
Balint
On Tue, Nov 27, 2012 at 10:18 AM, Stefano Speretta
<[email protected]>wrote:
> Hello,
>
> I just received some brand new WBX rev 3.0 and comparing them with some
> older rev 2.0 WBX, I can see some differences.
> In particular there is a new IC (I guess an attenuator) in the TX chain of
> rev 3.0 that was not present in rev 2.0. Beside the IC,
> I noticed that the io_tx_14 pin is tied to that new IC and cannot be used
> as a GPIO anymore I tried to set it to 1 but it is always at 0).
>
> Is there a list of differences between rev 2.0 and 3.0 or a schematic of
> the WBX rev 3.0 available?
> Is there a list of GPIO pins that could be used on the WBX rev 3.0 (that
> are not used internally)?
>
> Cheers,
> Stefano
>
>
> --
> Stefano Speretta
> ISIS - Innovative Solutions In Space BV
> Molengraaffsingel 12-14
> 2629 JD Delft
> The Netherlands
>
> Phone: +31(0)15 256 9018
> Fax: +31(0)15 257 3969
> E-mail: [email protected]
> Web: www.isispace.nl
>
>
> ______________________________**_________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/**mailman/listinfo/usrp-users_**lists.ettus.com<http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
>
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------------------------------
Message: 4
Date: Tue, 18 Dec 2012 11:57:11 -0800
From: John Malsbury <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Differences between WBX rev 2.0 and 3.0
Message-ID:
<can5wegsbjhjpxbuo5bi6u2wbj3j9tzqrprcpeyzrdduvzfk...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Also, for more clarification - the tx AGC on Rev 2.0 was moved and replaced
with that digitally controlled atten...
-John
On Tue, Dec 18, 2012 at 11:37 AM, Balint Seeber <[email protected]>wrote:
> Hi Stefano,
>
> You are correct: io_tx_14 is taken to that new IC, which as you guessed is
> a digitally-controlled attenuator.
>
> Apart from adding that chip, the only other change is the preceding
> quadrature modulator IC was changed to a version without an internal
> attenuator.
>
> The remaining io_tx[13:8] GPIO lines should still be available for your
> use.
>
> Let me know if you require any more info.
>
> Kind regards,
> Balint
>
>
> On Tue, Nov 27, 2012 at 10:18 AM, Stefano Speretta <[email protected]
> > wrote:
>
>> Hello,
>>
>> I just received some brand new WBX rev 3.0 and comparing them with some
>> older rev 2.0 WBX, I can see some differences.
>> In particular there is a new IC (I guess an attenuator) in the TX chain
>> of rev 3.0 that was not present in rev 2.0. Beside the IC,
>> I noticed that the io_tx_14 pin is tied to that new IC and cannot be used
>> as a GPIO anymore I tried to set it to 1 but it is always at 0).
>>
>> Is there a list of differences between rev 2.0 and 3.0 or a schematic of
>> the WBX rev 3.0 available?
>> Is there a list of GPIO pins that could be used on the WBX rev 3.0 (that
>> are not used internally)?
>>
>> Cheers,
>> Stefano
>>
>>
>> --
>> Stefano Speretta
>> ISIS - Innovative Solutions In Space BV
>> Molengraaffsingel 12-14
>> 2629 JD Delft
>> The Netherlands
>>
>> Phone: +31(0)15 256 9018
>> Fax: +31(0)15 257 3969
>> E-mail: [email protected]
>> Web: www.isispace.nl
>>
>>
>> ______________________________**_________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/**mailman/listinfo/usrp-users_**lists.ettus.com<http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
>>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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------------------------------
Message: 5
Date: Tue, 18 Dec 2012 22:13:29 +0100
From: raboteauo <[email protected]>
To: [email protected]
Subject: [USRP-users] how many lost samples ?
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi usrp folks,
Since may last short question has no answer, I expose my problem in more details
(perhaps it was not clear enough):
I am interesting to know how many samples are lost during a streaming process.
I receive
samples with a "uhd::rx_streamer" object of size "samps_per_buff". My
experience about
overflow with usrpN210 is :
when I receive a block with size N < samps_per_buf, the next call to
rx_stream->recv
will
generate an overflow error code (and zero size returned). Does this means that
the recv
method should always
returns samps_per_buf samples in normal conditions (excepting overflow) ?
How can I estimate the right number of losted samples ?
- is it (samps_per_buff - N) + samps_per_buff
- should I use the meta_data::time_spec to compute the number of losted samples
? does
this time_spec
already significant even for overflow conditions ?
- another method ?
Any help is appreciated.
thanks.
Olivier
------------------------------
Message: 6
Date: Tue, 18 Dec 2012 22:54:03 +0000
From: Juan Daniel Fernandez Martinez <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] how to Implement message passing
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hi everyone,
I need to implement message passing, my idea is to make some sort of message
source (I inherit from public gr_sync_block) that works as a controller for
another block (it has to send a message each 6 minutes).
I read that is necessary to inherit from gnuradio::block. In the .h file I
added the #include <gnuradio/block.h> and inherited from gnuradio::block (like
this "class JDFM_API jdfm_control : public gr_sync_block, public
gnuradio::block"). I know that I have redefine a constructor: gnuradio::block
constructor but I dont know how to do it, i mean, I don't understand the
parameters [("my block", in_sig, out_sig, msg_signature(1, 2)], can I keep my
regular constructor?, can I still use gnuradio-companion if I create a block
that inherits from block? where do I define the behaviour of sending messages? .
I haven't been able to find a simple example of messages implementation. If
anyone can guide me or show me an example, it would be awesome.
Thanks in advance.
________________________________
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Message: 7
Date: Wed, 19 Dec 2012 11:21:27 +0530
From: Usrp IITM <[email protected]>
To: Balint Seeber <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] USRP SBX daughter board
Message-ID:
<CAPkh=_86mngup51rxe3_vag5wmvrfd-xg+ec28khbcrcvaz...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
The spur is not consistent. For example see the spectrum when fc = 2.49G
and 2.46 G. In the 2.46G case, the spur is at the centre of the null
sub-carriers, while for the 2.49 case, the spur is slightly towards the
left.
I have tested this with a couple of SBX boards? Is this a feature;) of the
board?
Is there any special API (different from rfx2400) for this board? I
-RK
On Tue, Dec 18, 2012 at 11:54 PM, Usrp IITM <[email protected]>wrote:
>
>
> On Tue, Dec 18, 2012 at 11:17 PM, Balint Seeber
> <[email protected]>wrote:
>
>> Hi RK,
>>
>> A few questions to help narrow down the issue:
>>
>> 1. Did you run the calibration utilities on the TX side? (RX side
>> would probably be beneficial too.)
>> http://files.ettus.com/uhd_docs/manual/html/calibration.html
>> Results are stored and selected per daughterboard, so keep that in
>> mind when swapping between the two.
>>
>> We ran the calibration tests for both the transmitter and the receiver.
>
>
>>
>> 1. Have you had a look at the spectrum when you applied small shifts
>> in the TX centre frequency? Does that spur move consistently with the rest
>> of the OFDM signal? (The odd thing is that it's slightly offset to the
>> left
>> of centre between the two OFDM carriers...)
>>
>> I observed it too, I have to check this. Will post the results in the
> morning. BTW,
>
>
>> Balint
>>
>>
>> On Tue, Dec 18, 2012 at 3:32 AM, Usrp IITM <[email protected]>wrote:
>>
>>> Hi Matt,
>>>
>>> We are able to see the spectrum now. There was some small bug.
>>>
>>> However the carrier is being transmitted by the SBX board. We have a
>>> transmit filter that has a notch at DC, so technically the data has no DC
>>> component (before being sent to the USRP). The carrier is absent when we
>>> use the RFX2400 board to transmit. We are using a centre frequency of 2.49
>>> Ghz and receiving with an RFX2400 board. Please see the attached pictures.
>>>
>>> RFX2400 TX
>>> [image: Inline image 1]
>>>
>>> *SBX* *TX*
>>>
>>> [image: Inline image 2]
>>> Any suggestion as to why this is happening?
>>>
>>> -Regards
>>> RK
>>>
>>> On Tue, Dec 18, 2012 at 1:03 PM, Matt Ettus <[email protected]> wrote:
>>>
>>>>
>>>> The SBX has controllable gain on TX as well as RX. How did you set the
>>>> gain? Are you able to see anything on an FFT display?
>>>>
>>>> Matt
>>>>
>>>>
>>>> On Thu, Dec 13, 2012 at 11:12 PM, Usrp IITM
>>>> <[email protected]>wrote:
>>>>
>>>>> We are trying to implement OFDM point to point link using USRPN210.
>>>>> The frequency used is 2.49GHz. When we used RFX2400 daughter board in
>>>>> transmitter ,it works for rate of 5MHz for a Rx gain of 40dB-50dB. But
>>>>> when
>>>>> we use SBX daughter board(which has variable transmit gain), it doesn't
>>>>> work for 5 MHz rate.We can't even see a spectrum in the reciever.Can
>>>>> someone explain how to adjust the gain for different rates and all other
>>>>> specifications of SBX daughterboard.
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> USRP-users mailing list
>>>>> [email protected]
>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>>>
>>>>>
>>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing list
>>> [email protected]
>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>
>>>
>>
>
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------------------------------
Message: 8
Date: Wed, 19 Dec 2012 07:02:12 +0100
From: Bastian Bloessl <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] USRP SBX daughter board
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi,
On 12/19/2012 06:51 AM, Usrp IITM wrote:
> The spur is not consistent. For example see the spectrum when fc = 2.49G
> and 2.46 G. In the 2.46G case, the spur is at the centre of the null
> sub-carriers, while for the 2.49 case, the spur is slightly towards the
> left.
did you place the USRPs close to each other and thus, see the oscillator
of the second one as a slightly shifted DC component.
Bastian
------------------------------
Message: 9
Date: Wed, 19 Dec 2012 11:53:22 +0530
From: Usrp IITM <[email protected]>
To: Bastian Bloessl <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] USRP SBX daughter board
Message-ID:
<CAPkh=_-MB5rAZVFw1Prg8wXnPt-Dkq=owvj3d9j5whxfrkf...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
We are placing them about 2.5 meters apart and we are using a TX gain of 35
for SBX and RX gain of 40 for the RFX2400.
-RK
On Wed, Dec 19, 2012 at 11:32 AM, Bastian Bloessl
<[email protected]>wrote:
> Hi,
>
>
> On 12/19/2012 06:51 AM, Usrp IITM wrote:
>
>> The spur is not consistent. For example see the spectrum when fc = 2.49G
>> and 2.46 G. In the 2.46G case, the spur is at the centre of the null
>> sub-carriers, while for the 2.49 case, the spur is slightly towards the
>> left.
>>
>
> did you place the USRPs close to each other and thus, see the oscillator
> of the second one as a slightly shifted DC component.
>
> Bastian
>
>
> ______________________________**_________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/**mailman/listinfo/usrp-users_**lists.ettus.com<http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
>
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Subject: Digest Footer
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------------------------------
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