From wyjiang at ljshuoda.com  Fri Jun  7 07:21:56 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 7 Jun 2013 15:21:56 +0800
Subject: Time to Switching Frequence
Message-ID: <2013060715215614730227@ljshuoda.com>

Hi All,

I have a project to monitoring ( air sniffer ) the data between GSM BTS and MS using UmTRX.
Uplink Transmission is delayed 3 slots than downlink from specification. 
So when I sync. with BTS and get the downlink slot data, I must switch the freqs of receiver from downlink to uplink in less than 2 slots.
When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the UmTRX switch to the 'wFreq' ?

Thanks in advance.




Jiang WenYi
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From 246tnt at gmail.com  Fri Jun  7 09:00:19 2013
From: 246tnt at gmail.com (Sylvain Munaut)
Date: Fri, 7 Jun 2013 11:00:19 +0200
Subject: Time to Switching Frequence
In-Reply-To: <2013060715215614730227@ljshuoda.com>
References: <2013060715215614730227@ljshuoda.com>
Message-ID: <CAHL+j09afS7eQN25iG2Zo-w8_XNFXGKc9=_qisjUwWV0a+M+xw@mail.gmail.com>

>
> I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> MS using UmTRX.
> Uplink Transmission is delayed 3 slots than downlink from specification.
> So when I sync. with BTS and get the downlink slot data, I must switch the
> freqs of receiver from downlink to uplink in less than 2 slots.
> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> UmTRX switch to the 'wFreq' ?

It's not specified. It'll be variable and will most likely be more in
the order of milliseconds than microseconds.

A much better plan would be to use the two channels of the UmTRX and
tune one to Downlink and one to Uplink.


Cheers,

    Sylvain



From alexander.chemeris at gmail.com  Fri Jun  7 10:12:59 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Fri, 7 Jun 2013 14:12:59 +0400
Subject: Time to Switching Frequence
In-Reply-To: <2013060715215614730227@ljshuoda.com>
References: <2013060715215614730227@ljshuoda.com>
Message-ID: <CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>

Jiang,

It's not tested. LMS6002D chip by itself has quite short tuning time,
but the current host and FPGA code introduce significant delay. I
can't find exact numbers regarding LMS tuning time, but IIRC it was
shorter than a GSM timeslot.

So, as Sylvain said, given software limitations it's easier to use two
channels of UmTRX to receive on two frequencies.

On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi All,
>
> I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> MS using UmTRX.
> Uplink Transmission is delayed 3 slots than downlink from specification.
> So when I sync. with BTS and get the downlink slot data, I must switch the
> freqs of receiver from downlink to uplink in less than 2 slots.
> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> UmTRX switch to the 'wFreq' ?
>
> Thanks in advance.
>
> ________________________________
> Jiang WenYi



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru



From wyjiang at ljshuoda.com  Fri Jun  7 10:33:31 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 7 Jun 2013 18:33:31 +0800
Subject: Time to Switching Frequence
References: <2013060715215614730227@ljshuoda.com>, 
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
Message-ID: <2013060718333142061629@ljshuoda.com>

OK.
Thank you and Sylvain very much!




jiangwy

From: Alexander Chemeris
Date: 2013-06-07 18:12
To: wyjiang
CC: UmTRX
Subject: Re: Time to Switching Frequence
Jiang,

It's not tested. LMS6002D chip by itself has quite short tuning time,
but the current host and FPGA code introduce significant delay. I
can't find exact numbers regarding LMS tuning time, but IIRC it was
shorter than a GSM timeslot.

So, as Sylvain said, given software limitations it's easier to use two
channels of UmTRX to receive on two frequencies.

On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi All,
>
> I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> MS using UmTRX.
> Uplink Transmission is delayed 3 slots than downlink from specification.
> So when I sync. with BTS and get the downlink slot data, I must switch the
> freqs of receiver from downlink to uplink in less than 2 slots.
> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> UmTRX switch to the 'wFreq' ?
>
> Thanks in advance.
>
> ________________________________
> Jiang WenYi



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From andreysviyaz at gmail.com  Fri Jun  7 10:54:35 2013
From: andreysviyaz at gmail.com (Andrey Sviyazov)
Date: Fri, 7 Jun 2013 14:54:35 +0400
Subject: Time to Switching Frequence
In-Reply-To: <2013060718333142061629@ljshuoda.com>
References: <2013060715215614730227@ljshuoda.com>
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
	<2013060718333142061629@ljshuoda.com>
Message-ID: <CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>

Hi Jiang.

Please remember that Rx and Tx of LMS can't work well at the same frequency
due to PLL's problems.
Also, please do not forget about TxLO leakage which is quite significant.

Best regards,
Andrey Sviyazov.
(Sent from my mobile client)
07.06.2013 14:36 ???????????? "jiangwy" <wyjiang at ljshuoda.com> ???????:

> **
> OK.
> Thank you and Sylvain very much!
>
> ------------------------------
> jiangwy
>
>  *From:* Alexander Chemeris <alexander.chemeris at gmail.com>
> *Date:* 2013-06-07 18:12
> *To:* wyjiang <wyjiang at ljshuoda.com>
> *CC:* UmTRX <umtrx at lists.osmocom.org>
> *Subject:* Re: Time to Switching Frequence
>  Jiang,
>
> It's not tested. LMS6002D chip by itself has quite short tuning time,
> but the current host and FPGA code introduce significant delay. I
> can't find exact numbers regarding LMS tuning time, but IIRC it was
> shorter than a GSM timeslot.
>
> So, as Sylvain said, given software limitations it's easier to use two
> channels of UmTRX to receive on two frequencies.
>
> On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
> > Hi All,
> >
>
> > I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> > MS using UmTRX.
> > Uplink Transmission is delayed 3 slots than downlink from specification.
>
> > So when I sync. with BTS and get the downlink slot data, I must switch the
> > freqs of receiver from downlink to uplink in less than 2 slots.
>
> > When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> > UmTRX switch to the 'wFreq' ?
> >
> > Thanks in advance.
> >
> > ________________________________
> > Jiang WenYi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>
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From andreysviyaz at gmail.com  Fri Jun  7 11:14:48 2013
From: andreysviyaz at gmail.com (Andrey Sviyazov)
Date: Fri, 7 Jun 2013 15:14:48 +0400
Subject: Time to Switching Frequence
In-Reply-To: <CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>
References: <2013060715215614730227@ljshuoda.com>
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
	<2013060718333142061629@ljshuoda.com>
	<CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>
Message-ID: <CAE9ARExdbBomJuAy+axixiHRoL3WGtE8+teO3dNXSiutLVpMxQ@mail.gmail.com>

Hi Jiang.

Sorry, I missed that you'll use only receivers.
So, no any problems in this case.

Best regards,
Andrey Sviyazov.
(Sent from my mobile client)
07.06.2013 14:54 ???????????? "Andrey Sviyazov" <andreysviyaz at gmail.com>
???????:

> Hi Jiang.
>
> Please remember that Rx and Tx of LMS can't work well at the same
> frequency due to PLL's problems.
> Also, please do not forget about TxLO leakage which is quite significant.
>
> Best regards,
> Andrey Sviyazov.
> (Sent from my mobile client)
> 07.06.2013 14:36 ???????????? "jiangwy" <wyjiang at ljshuoda.com> ???????:
>
>> **
>> OK.
>> Thank you and Sylvain very much!
>>
>> ------------------------------
>> jiangwy
>>
>>  *From:* Alexander Chemeris <alexander.chemeris at gmail.com>
>> *Date:* 2013-06-07 18:12
>> *To:* wyjiang <wyjiang at ljshuoda.com>
>> *CC:* UmTRX <umtrx at lists.osmocom.org>
>> *Subject:* Re: Time to Switching Frequence
>>  Jiang,
>>
>> It's not tested. LMS6002D chip by itself has quite short tuning time,
>> but the current host and FPGA code introduce significant delay. I
>> can't find exact numbers regarding LMS tuning time, but IIRC it was
>> shorter than a GSM timeslot.
>>
>> So, as Sylvain said, given software limitations it's easier to use two
>> channels of UmTRX to receive on two frequencies.
>>
>> On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> > Hi All,
>> >
>>
>> > I have a project to monitoring ( air sniffer ) the data between GSM BTS and
>> > MS using UmTRX.
>> > Uplink Transmission is delayed 3 slots than downlink from specification.
>>
>> > So when I sync. with BTS and get the downlink slot data, I must switch the
>> > freqs of receiver from downlink to uplink in less than 2 slots.
>>
>> > When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
>> > UmTRX switch to the 'wFreq' ?
>> >
>> > Thanks in advance.
>> >
>> > ________________________________
>> > Jiang WenYi
>>
>>
>>
>> --
>> Regards,
>> Alexander Chemeris.
>> CEO, Fairwaves LLC / ??? ???????
>> http://fairwaves.ru
>>
>
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From wyjiang at ljshuoda.com  Fri Jun  7 11:44:05 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 7 Jun 2013 19:44:05 +0800
Subject: Time to Switching Frequence
References: <2013060715215614730227@ljshuoda.com>
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
	<2013060718333142061629@ljshuoda.com>
	<CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>,
	<CAE9ARExdbBomJuAy+axixiHRoL3WGtE8+teO3dNXSiutLVpMxQ@mail.gmail.com>
Message-ID: <2013060719440560316531@ljshuoda.com>

Hi Andrey.

I see. But what's the TxLO leakage?




jiangwy

From: Andrey Sviyazov
Date: 2013-06-07 19:14
To: wyjiang
CC: umtrx; Chemeris Alexander
Subject: Re: Re: Time to Switching Frequence
Hi Jiang.
Sorry, I missed that you'll use only receivers.
So, no any problems in this case.
Best regards,
Andrey Sviyazov. 
(Sent from my mobile client)
07.06.2013 14:54 ???????????? "Andrey Sviyazov" <andreysviyaz at gmail.com> ???????:

Hi Jiang.
Please remember that Rx and Tx of LMS can't work well at the same frequency due to PLL's problems.
Also, please do not forget about TxLO leakage which is quite significant. 
Best regards,
Andrey Sviyazov. 
(Sent from my mobile client)
07.06.2013 14:36 ???????????? "jiangwy" <wyjiang at ljshuoda.com> ???????:

OK.
Thank you and Sylvain very much!




jiangwy

From: Alexander Chemeris
Date: 2013-06-07 18:12
To: wyjiang
CC: UmTRX
Subject: Re: Time to Switching Frequence
Jiang,

It's not tested. LMS6002D chip by itself has quite short tuning time,
but the current host and FPGA code introduce significant delay. I
can't find exact numbers regarding LMS tuning time, but IIRC it was
shorter than a GSM timeslot.

So, as Sylvain said, given software limitations it's easier to use two
channels of UmTRX to receive on two frequencies.

On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi All,
>
> I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> MS using UmTRX.
> Uplink Transmission is delayed 3 slots than downlink from specification.
> So when I sync. with BTS and get the downlink slot data, I must switch the
> freqs of receiver from downlink to uplink in less than 2 slots.
> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> UmTRX switch to the 'wFreq' ?
>
> Thanks in advance.
>
> ________________________________
> Jiang WenYi



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From andreysviyaz at gmail.com  Fri Jun  7 12:36:39 2013
From: andreysviyaz at gmail.com (Andrey Sviyazov)
Date: Fri, 7 Jun 2013 16:36:39 +0400
Subject: Time to Switching Frequence
In-Reply-To: <2013060719440560316531@ljshuoda.com>
References: <2013060715215614730227@ljshuoda.com>
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
	<2013060718333142061629@ljshuoda.com>
	<CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>
	<CAE9ARExdbBomJuAy+axixiHRoL3WGtE8+teO3dNXSiutLVpMxQ@mail.gmail.com>
	<2013060719440560316531@ljshuoda.com>
Message-ID: <CAE9AREwi6jZnQgkT_u+E+H_u06MfbbO7cCyegbQofMUCH38=BQ@mail.gmail.com>

Well.
It is Tx carrier frequency, which is typically below the modulated signal
on 40..60 dB.
You can see it on spectrum analyzer when there are no modulation.

Best regards,
Andrey Sviyazov.


2013/6/7 jiangwy <wyjiang at ljshuoda.com>

> **
> Hi Andrey.
>
> I see. But what's the TxLO leakage?
>
> ------------------------------
> jiangwy
>
>  *From:* Andrey Sviyazov <andreysviyaz at gmail.com>
> *Date:* 2013-06-07 19:14
> *To:* wyjiang <wyjiang at ljshuoda.com>
> *CC:* umtrx <umtrx at lists.osmocom.org>; Chemeris Alexander<alexander.chemeris at gmail.com>
> *Subject:* Re: Re: Time to Switching Frequence
>
> Hi Jiang.
>
> Sorry, I missed that you'll use only receivers.
> So, no any problems in this case.
>
> Best regards,
> Andrey Sviyazov.
> (Sent from my mobile client)
> 07.06.2013 14:54 ???????????? "Andrey Sviyazov" <andreysviyaz at gmail.com>
> ???????:
>
>> Hi Jiang.
>>
>> Please remember that Rx and Tx of LMS can't work well at the same
>> frequency due to PLL's problems.
>> Also, please do not forget about TxLO leakage which is quite significant.
>>
>> Best regards,
>> Andrey Sviyazov.
>> (Sent from my mobile client)
>> 07.06.2013 14:36 ???????????? "jiangwy" <wyjiang at ljshuoda.com> ???????:
>>
>>> **
>>> OK.
>>> Thank you and Sylvain very much!
>>>
>>> ------------------------------
>>> jiangwy
>>>
>>>  *From:* Alexander Chemeris <alexander.chemeris at gmail.com>
>>> *Date:* 2013-06-07 18:12
>>> *To:* wyjiang <wyjiang at ljshuoda.com>
>>> *CC:* UmTRX <umtrx at lists.osmocom.org>
>>> *Subject:* Re: Time to Switching Frequence
>>>  Jiang,
>>>
>>> It's not tested. LMS6002D chip by itself has quite short tuning time,
>>> but the current host and FPGA code introduce significant delay. I
>>> can't find exact numbers regarding LMS tuning time, but IIRC it was
>>> shorter than a GSM timeslot.
>>>
>>> So, as Sylvain said, given software limitations it's easier to use two
>>> channels of UmTRX to receive on two frequencies.
>>>
>>> On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
>>> > Hi All,
>>> >
>>>
>>> > I have a project to monitoring ( air sniffer ) the data between GSM BTS and
>>> > MS using UmTRX.
>>>
>>> > Uplink Transmission is delayed 3 slots than downlink from specification.
>>>
>>> > So when I sync. with BTS and get the downlink slot data, I must switch the
>>> > freqs of receiver from downlink to uplink in less than 2 slots.
>>>
>>> > When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
>>> > UmTRX switch to the 'wFreq' ?
>>> >
>>> > Thanks in advance.
>>> >
>>> > ________________________________
>>> > Jiang WenYi
>>>
>>>
>>>
>>> --
>>> Regards,
>>> Alexander Chemeris.
>>> CEO, Fairwaves LLC / ??? ???????
>>> http://fairwaves.ru
>>>
>>
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From wyjiang at ljshuoda.com  Fri Jun  7 12:47:07 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 7 Jun 2013 20:47:07 +0800
Subject: Time to Switching Frequence
References: <2013060715215614730227@ljshuoda.com>
	<CABmJbFWJfixkxFC5nQVnxTLshty7G=yFty=GdMSkVentD=yrqg@mail.gmail.com>
	<2013060718333142061629@ljshuoda.com>
	<CAE9AREyF1Bru96cK1P4OThLhWJ_8nFD=xLp5D1_5HMCnjgBcOA@mail.gmail.com>
	<CAE9ARExdbBomJuAy+axixiHRoL3WGtE8+teO3dNXSiutLVpMxQ@mail.gmail.com>
	<2013060719440560316531@ljshuoda.com>, 
	<CAE9AREwi6jZnQgkT_u+E+H_u06MfbbO7cCyegbQofMUCH38=BQ@mail.gmail.com>
Message-ID: <2013060720470726756233@ljshuoda.com>

OK. When I have time, I will try to seeing it.




jiangwy

From: Andrey Sviyazov
Date: 2013-06-07 20:36
To: wyjiang
CC: UmTRX; Alexander Chemeris
Subject: Re: Re: Time to Switching Frequence
Well.
It is Tx carrier frequency, which is typically below the modulated signal on 40..60 dB.
You can see it on spectrum analyzer when there are no modulation.


Best regards,
Andrey Sviyazov.



2013/6/7 jiangwy <wyjiang at ljshuoda.com>

Hi Andrey.

I see. But what's the TxLO leakage?




jiangwy

From: Andrey Sviyazov
Date: 2013-06-07 19:14
To: wyjiang
CC: umtrx; Chemeris Alexander
Subject: Re: Re: Time to Switching Frequence
Hi Jiang.
Sorry, I missed that you'll use only receivers.
So, no any problems in this case.
Best regards,
Andrey Sviyazov. 
(Sent from my mobile client)
07.06.2013 14:54 ???????????? "Andrey Sviyazov" <andreysviyaz at gmail.com> ???????:

Hi Jiang.
Please remember that Rx and Tx of LMS can't work well at the same frequency due to PLL's problems.
Also, please do not forget about TxLO leakage which is quite significant. 
Best regards,
Andrey Sviyazov. 
(Sent from my mobile client)
07.06.2013 14:36 ???????????? "jiangwy" <wyjiang at ljshuoda.com> ???????:

OK.
Thank you and Sylvain very much!




jiangwy

From: Alexander Chemeris
Date: 2013-06-07 18:12
To: wyjiang
CC: UmTRX
Subject: Re: Time to Switching Frequence
Jiang,

It's not tested. LMS6002D chip by itself has quite short tuning time,
but the current host and FPGA code introduce significant delay. I
can't find exact numbers regarding LMS tuning time, but IIRC it was
shorter than a GSM timeslot.

So, as Sylvain said, given software limitations it's easier to use two
channels of UmTRX to receive on two frequencies.

On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi All,
>
> I have a project to monitoring ( air sniffer ) the data between GSM BTS and
> MS using UmTRX.
> Uplink Transmission is delayed 3 slots than downlink from specification.
> So when I sync. with BTS and get the downlink slot data, I must switch the
> freqs of receiver from downlink to uplink in less than 2 slots.
> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the
> UmTRX switch to the 'wFreq' ?
>
> Thanks in advance.
>
> ________________________________
> Jiang WenYi



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From albertm at salleurl.edu  Mon Jun 17 09:23:17 2013
From: albertm at salleurl.edu (=?iso-8859-1?Q?Albert-Miquel_S=E1nchez?=)
Date: Mon, 17 Jun 2013 11:23:17 +0200
Subject: UmTRX
Message-ID: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>

Hello,

I?m an engineer from Spain and I?m interested in a GSM receiver because I
would like to study the internal signals for a research project. In
particular, I?m interested in the analysis of the IF signal, but, as
Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
real "IF" signal, there is only baseband signal. I guess I could also use
this signal for my purposes, but only if all 124 GSM channels can be found
at that point. I?m not sure if this is possible, since there is a low-pass
filter before. Does anybody know if I can extract that information, that is,
the analogic 124 channels after the RF mixer? If it is not possible with
this board, does anybody know if I can do it with another GSM transceiver
board?

Thank you very much in advance.

Best regards,

Albert

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From john.wilson at pathintelligence.com  Mon Jun 17 09:41:22 2013
From: john.wilson at pathintelligence.com (John Wilson)
Date: Mon, 17 Jun 2013 10:41:22 +0100
Subject: UmTRX
In-Reply-To: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
References: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
Message-ID: <CA+XJWjTUiBw79v5LynM8xvBWJYpasrT01FSZkTA37RTsD80R3g@mail.gmail.com>

If you need to extract them all simultaneously then you'd need about 25 MHz
baseband bandwidth, which I think at the moment is a bit more than the
UmTRX can do on one channel, you might be able to do something clever and
look across both channels maybe. That's a whole lot of processing as well,
I'm guessing you'll be analyzing the signals offline? USRP2 or USRP N
series and do about 25 MHz sustained on one channel, you'll need some good
network hardware on your PC to prevent overruns.

John


On 17 June 2013 10:23, Albert-Miquel S?nchez <albertm at salleurl.edu> wrote:

> Hello,****
>
> I?m an engineer from Spain and I?m interested in a GSM receiver because I
> would like to study the internal signals for a research project. In
> particular, I?m interested in the analysis of the IF signal, but, as
> Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
> real "IF" signal, there is only baseband signal. I guess I could also use
> this signal for my purposes, but only if all 124 GSM channels can be found
> at that point. I?m not sure if this is possible, since there is a low-pass
> filter before. Does anybody know if I can extract that information, that
> is, the analogic 124 channels after the RF mixer? If it is not possible
> with this board, does anybody know if I can do it with another GSM
> transceiver board?****
>
> Thank you very much in advance.****
>
> Best regards,****
>
> Albert****
>



-- 
*Dr. John Wilson*
Product development engineer, Path
Intelligence<http://www.pathintelligence.com/>
T +44 2392 388442    @pathintel
DETECT ? ANALYSE ? PREDICT ? INFLUENCE


Path Intelligence Limited, registered number 5176274. Registered in
England,
registered office at 1000 Lakeside North Harbour, Western Road, Portsmouth,
UK, PO6 3EN
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From 246tnt at gmail.com  Mon Jun 17 09:45:08 2013
From: 246tnt at gmail.com (Sylvain Munaut)
Date: Mon, 17 Jun 2013 11:45:08 +0200
Subject: UmTRX
In-Reply-To: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
References: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
Message-ID: <CAHL+j0_7Gibqh2OC2=KXsbQaY9oo6HBkat-rtefLo9H8D1p1Dw@mail.gmail.com>

Hi,

> I?m an engineer from Spain and I?m interested in a GSM receiver because I
> would like to study the internal signals for a research project. In
> particular, I?m interested in the analysis of the IF signal, but, as
> Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
> real "IF" signal, there is only baseband signal.

Well, they also have a optional GSM front end board that has an IF.
However it has a very narrow IF filter since the goal was to about
in-band interference from neighbour channels ...


> I guess I could also use
> this signal for my purposes, but only if all 124 GSM channels can be found
> at that point. I?m not sure if this is possible, since there is a low-pass
> filter before. Does anybody know if I can extract that information, that is,
> the analogic 124 channels after the RF mixer?

The filters can be set to 28 MHz wide and the LMS has analog I/Q debug
outputs, so yes you could get the analog out.
But it's I/Q  not a single signals so you'll need two fast ADC to get
it digitized.

OTOH why wouldn't you just use the ADC in the LMS ? They're clocked at
26 Mhz (or could even be fed higher frequency) and so you should be
able to get the whole 25 MHz of P-GSM band.

Cheers,

    Sylvain



From albertm at salleurl.edu  Mon Jun 17 10:08:41 2013
From: albertm at salleurl.edu (=?iso-8859-1?Q?Albert-Miquel_S=E1nchez?=)
Date: Mon, 17 Jun 2013 12:08:41 +0200
Subject: UmTRX
In-Reply-To: <CA+XJWjTUiBw79v5LynM8xvBWJYpasrT01FSZkTA37RTsD80R3g@mail.gmail.com>
References: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
	<CA+XJWjTUiBw79v5LynM8xvBWJYpasrT01FSZkTA37RTsD80R3g@mail.gmail.com>
Message-ID: <00cf01ce6b42$a5156760$ef403620$@edu>

Thank you very much for your response. I didn?t mention it, but I only want
to extract the analog signal (the 25 MHz baseband bandwidth), in order to
analyze the spectral content (I would capture this signal with another board
developed by us). Therefore, I don?t need to process it with the UmTRX.
However I need the UmTRX in order to do this analysis while keeping a phone
communication.

 

Best regards,

 

Albert

 

De: john.wilson at pathintel.com [mailto:john.wilson at pathintel.com] En nombre
de John Wilson
Enviado el: lunes, 17 de junio de 2013 11:41
Para: Albert-Miquel S?nchez
CC: umtrx at lists.osmocom.org
Asunto: Re: UmTRX

 

If you need to extract them all simultaneously then you'd need about 25 MHz
baseband bandwidth, which I think at the moment is a bit more than the UmTRX
can do on one channel, you might be able to do something clever and look
across both channels maybe. That's a whole lot of processing as well, I'm
guessing you'll be analyzing the signals offline? USRP2 or USRP N series and
do about 25 MHz sustained on one channel, you'll need some good network
hardware on your PC to prevent overruns.

John

 

On 17 June 2013 10:23, Albert-Miquel S?nchez <albertm at salleurl.edu> wrote:

Hello,

I?m an engineer from Spain and I?m interested in a GSM receiver because I
would like to study the internal signals for a research project. In
particular, I?m interested in the analysis of the IF signal, but, as
Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
real "IF" signal, there is only baseband signal. I guess I could also use
this signal for my purposes, but only if all 124 GSM channels can be found
at that point. I?m not sure if this is possible, since there is a low-pass
filter before. Does anybody know if I can extract that information, that is,
the analogic 124 channels after the RF mixer? If it is not possible with
this board, does anybody know if I can do it with another GSM transceiver
board?

Thank you very much in advance.

Best regards,

Albert




-- 
Dr. John Wilson
Product development engineer, Path Intelligence
<http://www.pathintelligence.com/> 
T +44 2392 388442    @pathintel
DETECT ? ANALYSE ? PREDICT ? INFLUENCE
 
<http://www.pathintelligence.com/wp-content/uploads/2013/03/emailmarketingba
nner.png> 

Path Intelligence Limited, registered number 5176274. Registered in England,

registered office at 1000 Lakeside North Harbour, Western Road, Portsmouth,
UK, PO6 3EN 

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From alexander.chemeris at gmail.com  Mon Jun 17 11:53:20 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Mon, 17 Jun 2013 15:53:20 +0400
Subject: UmTRX
In-Reply-To: <00cf01ce6b42$a5156760$ef403620$@edu>
References: <00bb01ce6b3c$4d9c6cf0$e8d546d0$@edu>
	<CA+XJWjTUiBw79v5LynM8xvBWJYpasrT01FSZkTA37RTsD80R3g@mail.gmail.com>
	<00cf01ce6b42$a5156760$ef403620$@edu>
Message-ID: <CABmJbFVBwvSCfkoZwc96RzZfDxykc2ucO9DKbg3sAAyeupYNpw@mail.gmail.com>

Albert,

In this case yes, it's possible. You could get RXOUT values on
the four test points at the north-west corner of the chip (TST5 - TST8).
Note, that they are differential and separate I/Q.

To acquire 25MHZ you could set LPF to 28MHz, as Sylvain pointed or
completely disable it. I strongly recommend you to use an external bandpass
filter in the latter case.

On Mon, Jun 17, 2013 at 2:08 PM, Albert-Miquel S?nchez <albertm at salleurl.edu
> wrote:

> Thank you very much for your response. I didn?t mention it, but I only
> want to extract the analog signal (the 25 MHz baseband bandwidth), in order
> to analyze the spectral content (I would capture this signal with another
> board developed by us). Therefore, I don?t need to process it with the
> UmTRX. However I need the UmTRX in order to do this analysis while keeping
> a phone communication.****
>
> ** **
>
> Best regards,****
>
> ** **
>
> Albert****
>
> ** **
>
> *De:* john.wilson at pathintel.com [mailto:john.wilson at pathintel.com] *En
> nombre de *John Wilson
> *Enviado el:* lunes, 17 de junio de 2013 11:41
> *Para:* Albert-Miquel S?nchez
> *CC:* umtrx at lists.osmocom.org
> *Asunto:* Re: UmTRX****
>
> ** **
>
> If you need to extract them all simultaneously then you'd need about 25
> MHz baseband bandwidth, which I think at the moment is a bit more than the
> UmTRX can do on one channel, you might be able to do something clever and
> look across both channels maybe. That's a whole lot of processing as well,
> I'm guessing you'll be analyzing the signals offline? USRP2 or USRP N
> series and do about 25 MHz sustained on one channel, you'll need some good
> network hardware on your PC to prevent overruns.****
>
> John****
>
> ** **
>
> On 17 June 2013 10:23, Albert-Miquel S?nchez <albertm at salleurl.edu> wrote:
> ****
>
> Hello,****
>
> I?m an engineer from Spain and I?m interested in a GSM receiver because I
> would like to study the internal signals for a research project. In
> particular, I?m interested in the analysis of the IF signal, but, as
> Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
> real "IF" signal, there is only baseband signal. I guess I could also use
> this signal for my purposes, but only if all 124 GSM channels can be found
> at that point. I?m not sure if this is possible, since there is a low-pass
> filter before. Does anybody know if I can extract that information, that
> is, the analogic 124 channels after the RF mixer? If it is not possible
> with this board, does anybody know if I can do it with another GSM
> transceiver board?****
>
> Thank you very much in advance.****
>
> Best regards,****
>
> Albert****
>
>
>
>
> --
> *Dr. John Wilson*
> Product development engineer, Path Intelligence<http://www.pathintelligence.com/>
> T +44 2392 388442    @pathintel
> DETECT ? ANALYSE ? PREDICT ? INFLUENCE
>
>
> Path Intelligence Limited, registered number 5176274. Registered in
> England,
> registered office at 1000 Lakeside North Harbour, Western Road,
> Portsmouth, UK, PO6 3EN ****
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From choukoumoun at gmail.com  Mon Jun 17 21:38:44 2013
From: choukoumoun at gmail.com (choukoumoun)
Date: Mon, 17 Jun 2013 23:38:44 +0200
Subject: UMTX IRC channel.
Message-ID: <51BF81E4.40906@gmail.com>

Hello List,

apparently there is no IRC channel UMTRX ...
an IRC channel was temporarily created to discuss the live UMTRX.

# umtrx on geeknode.

Bye
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From alexander.chemeris at gmail.com  Tue Jun 18 07:57:33 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Tue, 18 Jun 2013 11:57:33 +0400
Subject: UMTX IRC channel.
In-Reply-To: <51BF81E4.40906@gmail.com>
References: <51BF81E4.40906@gmail.com>
Message-ID: <CABmJbFVZPgXqhc-gTVkbPwtw9-JX05C8AkV8KrqjbW-QEc0YVg@mail.gmail.com>

Hi,

On Tue, Jun 18, 2013 at 1:38 AM, choukoumoun <choukoumoun at gmail.com> wrote:
> apparently there is no IRC channel UMTRX ...
> an IRC channel was temporarily created to discuss the live UMTRX.
>
> # umtrx on geeknode.

UmTRX is a part of Osmocom umbrella project, even though it's not
completely integrated with Osmocom web-appearance (yet). So I
recommend to use #osmocom channel on freenode for UmTRX chats. I'm
hanging out there when I'm online anyway (nick AChemeris).

I was thinking about a #umtrx channel on freenode, but I don't see
much value in a separate channel at this moment.

OTOH, as far as I understand, geeknode is for francophone community
and in this case it may make sense, but should be clearly declared.
Unfortunately, I don't speak French and can't participate, but I'm
looking forward to growing our francophone community. UmTRX is
manufactured in France, after all. :)

--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru



From alexander.chemeris at gmail.com  Tue Jun 25 10:17:25 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Tue, 25 Jun 2013 14:17:25 +0400
Subject: UmTRX firmware update
Message-ID: <CABmJbFUC8SpeLA=VtnD+iCupe8LSdGnNY-sEEVAZaNg8L=rS3g@mail.gmail.com>

Hi all,

If you use the latest UHD sources, you should update your ZPU firmware
to the latest version:
http://people.osmocom.org/ipse/umtrx-v2/fpga_bitsream/2013-06-25-2f3817a9/

You could update your FPGA image as well, but ZPU part is critical for
the smooth operation with the latest host side code. If you don't
update ZPU, all UHD utilities will exist on startup. The reason is
that the new host code sends a command to ZPU which older ZPUs does
not understand, so the host side code raises exception and exits.

A new feature which is the reason for the breakage is that now you
could not only set, but also read back the current value of the TCXO
calibration DAC. If you run this utility without any parameters, it
will autodetect UmTRX and read the DAC value from it.
https://github.com/fairwaves/umtrx_scripts/blob/master/python_lib/umtrx_vcxo.py
This is praticularly useful when you calibrate using GPS and want to
store this value to EEPROM to use it when GPS is not available.

--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru