From wyjiang at ljshuoda.com  Fri Aug  2 08:09:00 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 2 Aug 2013 16:09:00 +0800
Subject: The Difference of Signal Strength From Two Channels on The Same Board
	is Big
Message-ID: <2013080216085993955125@ljshuoda.com>

Hi Alexander Chemeris,

According to rx_multi_samples , I write a program to receive samples from two channels on the same board. 
The program receive samples from 2 channels and calculate the signal strength respectively. The signal is from a BTS arround.
I find the difference of signal strength is very big, about 20dB, and channel 1 is bigger than channel 0.
I  exchange the antenna and feeder of the them, but the result is same.
I think there is some problem, but I cann't find it.
Would you please give me some sugguestion?

Best Regards.




Jiang Wenyi
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From alexander.chemeris at gmail.com  Fri Aug  2 08:20:16 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Fri, 2 Aug 2013 12:20:16 +0400
Subject: The Difference of Signal Strength From Two Channels on The Same
	Board is Big
In-Reply-To: <2013080216085993955125@ljshuoda.com>
References: <2013080216085993955125@ljshuoda.com>
Message-ID: <CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>

Hi Jiang,

Are you sure you're setting Rx gain properly for both channels?
I recommend you to use umtrx_lms.py script from this repository to
check Rx LNA and Rx VGA settings for both LMS chips:
https://github.com/fairwaves/umtrx_scripts

On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi Alexander Chemeris,
>
> According to rx_multi_samples , I write a program to receive samples from
> two channels on the same board.
> The program receive samples from 2 channels and calculate the signal
> strength respectively. The signal is from a BTS arround.
> I find the difference of signal strength is very big, about 20dB, and
> channel 1 is bigger than channel 0.
> I  exchange the antenna and feeder of the them, but the result is same.
> I think there is some problem, but I cann't find it.
> Would you please give me some sugguestion?
>
> Best Regards.
>
> ________________________________
> Jiang Wenyi



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



From wyjiang at ljshuoda.com  Fri Aug  2 08:55:55 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 2 Aug 2013 16:55:55 +0800
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
References: <2013080216085993955125@ljshuoda.com>, 
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
Message-ID: <2013080216555509789328@ljshuoda.com>

I use the following command

./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain 

the outputs are all the same ( 15 ).




jiangwy

From: Alexander Chemeris
Date: 2013-08-02 16:20
To: wyjiang
CC: UmTRX
Subject: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Hi Jiang,

Are you sure you're setting Rx gain properly for both channels?
I recommend you to use umtrx_lms.py script from this repository to
check Rx LNA and Rx VGA settings for both LMS chips:
https://github.com/fairwaves/umtrx_scripts

On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> Hi Alexander Chemeris,
>
> According to rx_multi_samples , I write a program to receive samples from
> two channels on the same board.
> The program receive samples from 2 channels and calculate the signal
> strength respectively. The signal is from a BTS arround.
> I find the difference of signal strength is very big, about 20dB, and
> channel 1 is bigger than channel 0.
> I  exchange the antenna and feeder of the them, but the result is same.
> I think there is some problem, but I cann't find it.
> Would you please give me some sugguestion?
>
> Best Regards.
>
> ________________________________
> Jiang Wenyi



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From alexander.chemeris at gmail.com  Fri Aug  2 09:30:18 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Fri, 2 Aug 2013 13:30:18 +0400
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
In-Reply-To: <2013080216555509789328@ljshuoda.com>
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>
Message-ID: <CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>

Ok.

Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).

Then, could you check whether this is consistent among both UmTRX you have?

On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> I use the following command
>
> ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>
> the outputs are all the same ( 15 ).
>
> ________________________________
> jiangwy
>
> From: Alexander Chemeris
> Date: 2013-08-02 16:20
> To: wyjiang
> CC: UmTRX
> Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> Board is Big
> Hi Jiang,
>
> Are you sure you're setting Rx gain properly for both channels?
> I recommend you to use umtrx_lms.py script from this repository to
> check Rx LNA and Rx VGA settings for both LMS chips:
> https://github.com/fairwaves/umtrx_scripts
>
> On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> Hi Alexander Chemeris,
>>
>> According to rx_multi_samples , I write a program to receive samples from
>> two channels on the same board.
>> The program receive samples from 2 channels and calculate the signal
>> strength respectively. The signal is from a BTS arround.
>> I find the difference of signal strength is very big, about 20dB, and
>> channel 1 is bigger than channel 0.
>> I  exchange the antenna and feeder of the them, but the result is same.
>> I think there is some problem, but I cann't find it.
>> Would you please give me some sugguestion?
>>
>> Best Regards.
>>
>> ________________________________
>> Jiang Wenyi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>



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



From wyjiang at ljshuoda.com  Fri Aug  2 11:09:26 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 2 Aug 2013 19:09:26 +0800
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>, 
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
Message-ID: <2013080219092613689349@ljshuoda.com>

umtrx_lms.py --lms-get-rx-lna --lms 1 
umtrx_lms.py --lms-get-rx-lna --lms 2

then output nothing




jiangwy

From: Alexander Chemeris
Date: 2013-08-02 17:30
To: wyjiang
CC: UmTRX
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Ok.

Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).

Then, could you check whether this is consistent among both UmTRX you have?

On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> I use the following command
>
> ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>
> the outputs are all the same ( 15 ).
>
> ________________________________
> jiangwy
>
> From: Alexander Chemeris
> Date: 2013-08-02 16:20
> To: wyjiang
> CC: UmTRX
> Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> Board is Big
> Hi Jiang,
>
> Are you sure you're setting Rx gain properly for both channels?
> I recommend you to use umtrx_lms.py script from this repository to
> check Rx LNA and Rx VGA settings for both LMS chips:
> https://github.com/fairwaves/umtrx_scripts
>
> On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> Hi Alexander Chemeris,
>>
>> According to rx_multi_samples , I write a program to receive samples from
>> two channels on the same board.
>> The program receive samples from 2 channels and calculate the signal
>> strength respectively. The signal is from a BTS arround.
>> I find the difference of signal strength is very big, about 20dB, and
>> channel 1 is bigger than channel 0.
>> I  exchange the antenna and feeder of the them, but the result is same.
>> I think there is some problem, but I cann't find it.
>> Would you please give me some sugguestion?
>>
>> Best Regards.
>>
>> ________________________________
>> Jiang Wenyi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From wyjiang at ljshuoda.com  Fri Aug  2 11:53:35 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Fri, 2 Aug 2013 19:53:35 +0800
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>, 
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
Message-ID: <2013080219533573890852@ljshuoda.com>

I try another UmTRX board, and it's OK. The difference from the channel 0 and 1 is very small.




jiangwy

From: Alexander Chemeris
Date: 2013-08-02 17:30
To: wyjiang
CC: UmTRX
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Ok.

Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).

Then, could you check whether this is consistent among both UmTRX you have?

On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> I use the following command
>
> ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>
> the outputs are all the same ( 15 ).
>
> ________________________________
> jiangwy
>
> From: Alexander Chemeris
> Date: 2013-08-02 16:20
> To: wyjiang
> CC: UmTRX
> Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> Board is Big
> Hi Jiang,
>
> Are you sure you're setting Rx gain properly for both channels?
> I recommend you to use umtrx_lms.py script from this repository to
> check Rx LNA and Rx VGA settings for both LMS chips:
> https://github.com/fairwaves/umtrx_scripts
>
> On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> Hi Alexander Chemeris,
>>
>> According to rx_multi_samples , I write a program to receive samples from
>> two channels on the same board.
>> The program receive samples from 2 channels and calculate the signal
>> strength respectively. The signal is from a BTS arround.
>> I find the difference of signal strength is very big, about 20dB, and
>> channel 1 is bigger than channel 0.
>> I  exchange the antenna and feeder of the them, but the result is same.
>> I think there is some problem, but I cann't find it.
>> Would you please give me some sugguestion?
>>
>> Best Regards.
>>
>> ________________________________
>> Jiang Wenyi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From andreysviyaz at gmail.com  Fri Aug  2 16:54:27 2013
From: andreysviyaz at gmail.com (Andrey Sviyazov)
Date: Fri, 2 Aug 2013 20:54:27 +0400
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
In-Reply-To: <2013080219533573890852@ljshuoda.com>
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
	<2013080219533573890852@ljshuoda.com>
Message-ID: <CAE9AREzZYRJ4iTHSNk=jiXqkiavWPsNnqp0BLpMKoMtDBa7bQw@mail.gmail.com>

Hi Jiang Wenyi.

Please double check that both UmTRX's runs with the same FPGA images (and
firmware).
If absolutely the same then seems one board is broken.
Please double check it also by some other tests to be sure before send to
us for repair.

Best regards,
Andrey Sviyazov.


2013/8/2 jiangwy <wyjiang at ljshuoda.com>

> **
> I try another UmTRX board, and it's OK. The difference from the channel 0
> and 1 is very small.
>
> ------------------------------
> jiangwy
>
>  *From:* Alexander Chemeris <alexander.chemeris at gmail.com>
> *Date:* 2013-08-02 17:30
> *To:* wyjiang <wyjiang at ljshuoda.com>
> *CC:* UmTRX <umtrx at lists.osmocom.org>
> *Subject:* Re: Re: The Difference of Signal Strength From Two Channels on
> The Same Board is Big
>  Ok.
>
> Also check that a correct input is selected on both chips
> (--lms-get-rx-lna option).
>
> Then, could you check whether this is consistent among both UmTRX you have?
>
> On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> > I use the following command
> >
> > ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
> >
> > the outputs are all the same ( 15 ).
> >
> > ________________________________
> > jiangwy
> >
> > From: Alexander Chemeris
> > Date: 2013-08-02 16:20
> > To: wyjiang
> > CC: UmTRX
>
> > Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> > Board is Big
> > Hi Jiang,
> >
> > Are you sure you're setting Rx gain properly for both channels?
> > I recommend you to use umtrx_lms.py script from this repository to
> > check Rx LNA and Rx VGA settings for both LMS chips:
> > https://github.com/fairwaves/umtrx_scripts
> >
> > On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> >> Hi Alexander Chemeris,
> >>
>
> >> According to rx_multi_samples , I write a program to receive samples from
> >> two channels on the same board.
> >> The program receive samples from 2 channels and calculate the signal
> >> strength respectively. The signal is from a BTS arround.
> >> I find the difference of signal strength is very big, about 20dB, and
> >> channel 1 is bigger than channel 0.
> >> I  exchange the antenna and feeder of the them, but the result is same.
> >> I think there is some problem, but I cann't find it.
> >> Would you please give me some sugguestion?
> >>
> >> Best Regards.
> >>
> >> ________________________________
> >> Jiang Wenyi
> >
> >
> >
> > --
> > Regards,
> > Alexander Chemeris.
> > CEO, Fairwaves LLC / ??? ???????
> > http://fairwaves.ru
> >
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>
>
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From wyjiang at ljshuoda.com  Sat Aug  3 02:19:47 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Sat, 3 Aug 2013 10:19:47 +0800
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
	<2013080219533573890852@ljshuoda.com>, 
	<CAE9AREzZYRJ4iTHSNk=jiXqkiavWPsNnqp0BLpMKoMtDBa7bQw@mail.gmail.com>
Message-ID: <201308031019472852417@ljshuoda.com>

Hi Andrey Sviyazov

I confirm that  both UmTRX's runs with the same FPGA images (and firmware). I have updated them to the latest version.
I will try some other programs to check the problem.

Best Regards,




jiangwy

From: Andrey Sviyazov
Date: 2013-08-03 00:54
To: wyjiang
CC: UmTRX; Alexander Chemeris
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Hi Jiang Wenyi.


Please double check that both UmTRX's runs with the same FPGA images (and firmware).
If absolutely the same then seems one board is broken.
Please double check it also by some other tests to be sure before send to us for repair.


Best regards,
Andrey Sviyazov.



2013/8/2 jiangwy <wyjiang at ljshuoda.com>

I try another UmTRX board, and it's OK. The difference from the channel 0 and 1 is very small.




jiangwy

From: Alexander Chemeris
Date: 2013-08-02 17:30
To: wyjiang
CC: UmTRX
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Ok.

Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).

Then, could you check whether this is consistent among both UmTRX you have?

On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> I use the following command
>
> ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>
> the outputs are all the same ( 15 ).
>
> ________________________________
> jiangwy
>
> From: Alexander Chemeris
> Date: 2013-08-02 16:20
> To: wyjiang
> CC: UmTRX
> Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> Board is Big
> Hi Jiang,
>
> Are you sure you're setting Rx gain properly for both channels?
> I recommend you to use umtrx_lms.py script from this repository to
> check Rx LNA and Rx VGA settings for both LMS chips:
> https://github.com/fairwaves/umtrx_scripts
>
> On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> Hi Alexander Chemeris,
>>
>> According to rx_multi_samples , I write a program to receive samples from
>> two channels on the same board.
>> The program receive samples from 2 channels and calculate the signal
>> strength respectively. The signal is from a BTS arround.
>> I find the difference of signal strength is very big, about 20dB, and
>> channel 1 is bigger than channel 0.
>> I  exchange the antenna and feeder of the them, but the result is same.
>> I think there is some problem, but I cann't find it.
>> Would you please give me some sugguestion?
>>
>> Best Regards.
>>
>> ________________________________
>> Jiang Wenyi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From wyjiang at ljshuoda.com  Sat Aug  3 02:48:56 2013
From: wyjiang at ljshuoda.com (jiangwy)
Date: Sat, 3 Aug 2013 10:48:56 +0800
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
	<2013080219533573890852@ljshuoda.com>, 
	<CAE9AREzZYRJ4iTHSNk=jiXqkiavWPsNnqp0BLpMKoMtDBa7bQw@mail.gmail.com>
Message-ID: <2013080310485670705910@ljshuoda.com>

Hi Andrey Sviyazov.

I have tried the kal program on both boards, the output are:

The following commands are executed on the normal board
./kal -s GSM900 -v -R A:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 19506.878626                                                               
        chan: 11 (937.2MHz - 13.389kHz) power: 53673.23                       
        chan: 14 (937.8MHz +   4Hz)     power: 64031.10                       
        chan: 16 (938.2MHz +  30Hz)     power: 37823.70                                             
        chan: 43 (943.6MHz +   2Hz)     power: 77249.29                                        
        chan: 50 (945.0MHz -  24Hz)     power: 29420.52                                             

./kal -s GSM900 -v -R B:0        
kal: Scanning for GSM-900 base stations.
channel detect threshold: 28406.616263                                                              
        chan: 11 (937.2MHz - 6.120kHz)  power: 53776.77                       
        chan: 14 (937.8MHz -  59Hz)     power: 76683.83                       
        chan: 16 (938.2MHz + 28.945kHz) power: 46724.84                                                                                          
        chan: 43 (943.6MHz + 38.130kHz) power: 65350.20                       
        chan: 50 (945.0MHz -  21Hz)     power: 29930.09           

The following commands are executed on another board seeming to be abnormal
./kal -s GSM900 -v -R A:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 4486.504362                                         
        chan: 5 (936.0MHz -  15Hz)      power: 6734.70                        
        chan: 12 (937.4MHz +  50Hz)     power: 9339.20                                                
        chan: 83 (951.6MHz -  13Hz)     power: 6462.91          
        
./kal -s GSM900 -v -R B:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 27671.315417                                        
        chan: 5 (936.0MHz +  24Hz)      power: 29673.93                                           
        chan: 12 (937.4MHz +  40Hz)     power: 69096.60                                            
        chan: 83 (951.6MHz -   4Hz)     power: 46394.73                       

./kal -c 1004 -R A:0
kal: Calculating clock frequency offset.
Using E-GSM-900 channel 1004 (931.0MHz)
average         [min, max]      (range, stddev)
+   2Hz         [-80, 79]       (159, 44.543312)
overruns: 0
not found: 34

./kal -c 1004 -R B:0
kal: Calculating clock frequency offset.
Using E-GSM-900 channel 1004 (931.0MHz)
average         [min, max]      (range, stddev)
+   1Hz         [-13, 19]       (32, 8.658517)
overruns: 0
not found: 0  

Best Regards.




jiangwy

From: Andrey Sviyazov
Date: 2013-08-03 00:54
To: wyjiang
CC: UmTRX; Alexander Chemeris
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Hi Jiang Wenyi.


Please double check that both UmTRX's runs with the same FPGA images (and firmware).
If absolutely the same then seems one board is broken.
Please double check it also by some other tests to be sure before send to us for repair.


Best regards,
Andrey Sviyazov.



2013/8/2 jiangwy <wyjiang at ljshuoda.com>

I try another UmTRX board, and it's OK. The difference from the channel 0 and 1 is very small.




jiangwy

From: Alexander Chemeris
Date: 2013-08-02 17:30
To: wyjiang
CC: UmTRX
Subject: Re: Re: The Difference of Signal Strength From Two Channels on The Same Board is Big
Ok.

Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).

Then, could you check whether this is consistent among both UmTRX you have?

On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
> I use the following command
>
> ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>
> the outputs are all the same ( 15 ).
>
> ________________________________
> jiangwy
>
> From: Alexander Chemeris
> Date: 2013-08-02 16:20
> To: wyjiang
> CC: UmTRX
> Subject: Re: The Difference of Signal Strength From Two Channels on The Same
> Board is Big
> Hi Jiang,
>
> Are you sure you're setting Rx gain properly for both channels?
> I recommend you to use umtrx_lms.py script from this repository to
> check Rx LNA and Rx VGA settings for both LMS chips:
> https://github.com/fairwaves/umtrx_scripts
>
> On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> Hi Alexander Chemeris,
>>
>> According to rx_multi_samples , I write a program to receive samples from
>> two channels on the same board.
>> The program receive samples from 2 channels and calculate the signal
>> strength respectively. The signal is from a BTS arround.
>> I find the difference of signal strength is very big, about 20dB, and
>> channel 1 is bigger than channel 0.
>> I  exchange the antenna and feeder of the them, but the result is same.
>> I think there is some problem, but I cann't find it.
>> Would you please give me some sugguestion?
>>
>> Best Regards.
>>
>> ________________________________
>> Jiang Wenyi
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ??? ???????
> http://fairwaves.ru
>



-- 
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ??? ???????
http://fairwaves.ru
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From alexander.chemeris at gmail.com  Mon Aug  5 10:30:33 2013
From: alexander.chemeris at gmail.com (Alexander Chemeris)
Date: Mon, 5 Aug 2013 14:30:33 +0400
Subject: The Difference of Signal Strength From Two Channels on The
	Same Board is Big
In-Reply-To: <2013080310485670705910@ljshuoda.com>
References: <2013080216085993955125@ljshuoda.com>
	<CABmJbFUDu62wuqQbmkGM3_4nGwf3L0XjTsewnSyyUuAwv610VQ@mail.gmail.com>
	<2013080216555509789328@ljshuoda.com>
	<CABmJbFV5nqRhH0HEvQUVv2Y737gbkd8eiJ8j6b-1RJRxdFqd0w@mail.gmail.com>
	<2013080219533573890852@ljshuoda.com>
	<CAE9AREzZYRJ4iTHSNk=jiXqkiavWPsNnqp0BLpMKoMtDBa7bQw@mail.gmail.com>
	<2013080310485670705910@ljshuoda.com>
Message-ID: <CABmJbFXoVVtD3HASQBdU=PCC4UYV52gJhagzSEP5X5Et_Zi5MQ@mail.gmail.com>

??????, ?????? ??? ???? ??????
???? ? ????? ???????.


On Sat, Aug 3, 2013 at 6:48 AM, jiangwy <wyjiang at ljshuoda.com> wrote:

> **
> Hi Andrey Sviyazov.
>
> I have tried the kal program on both boards, the output are:
>
>  The following commands are executed on the normal board
> ./kal -s GSM900 -v -R A:0
> kal: Scanning for GSM-900 base stations.
>
> channel detect threshold: 19506.878626
>
>         chan: 11 (937.2MHz - 13.389kHz) power: 53673.23
>
>         chan: 14 (937.8MHz +   4Hz)     power: 64031.10
>
>         chan: 16 (938.2MHz +  30Hz)     power: 37823.70
>
>         chan: 43 (943.6MHz +   2Hz)     power: 77249.29
>
>         chan: 50 (945.0MHz -  24Hz)     power: 29420.52
>
> ./kal -s GSM900 -v -R B:0
> kal: Scanning for GSM-900 base stations.
>
> channel detect threshold: 28406.616263
>
>         chan: 11 (937.2MHz - 6.120kHz)  power: 53776.77
>
>         chan: 14 (937.8MHz -  59Hz)     power: 76683.83
>
>         chan: 16 (938.2MHz + 28.945kHz) power: 46724.84
>
>         chan: 43 (943.6MHz + 38.130kHz) power: 65350.20
>         chan: 50 (945.0MHz -  21Hz)     power: 29930.09
>
> The following commands are executed on another board seeming to be abnormal
> ./kal -s GSM900 -v -R A:0
> kal: Scanning for GSM-900 base stations.
>
> channel detect threshold: 4486.504362
>
>         chan: 5 (936.0MHz -  15Hz)      power: 6734.70
>
>         chan: 12 (937.4MHz +  50Hz)     power: 9339.20
>         chan: 83 (951.6MHz -  13Hz)     power: 6462.91
>
> ./kal -s GSM900 -v -R B:0
> kal: Scanning for GSM-900 base stations.
>
> channel detect threshold: 27671.315417
>
>         chan: 5 (936.0MHz +  24Hz)      power: 29673.93
>
>         chan: 12 (937.4MHz +  40Hz)     power: 69096.60
>
>         chan: 83 (951.6MHz -   4Hz)     power: 46394.73
>
> ./kal -c 1004 -R A:0
> kal: Calculating clock frequency offset.
> Using E-GSM-900 channel 1004 (931.0MHz)
> average         [min, max]      (range, stddev)
> +   2Hz         [-80, 79]       (159, 44.543312)
> overruns: 0
> not found: 34
>
> ./kal -c 1004 -R B:0
> kal: Calculating clock frequency offset.
> Using E-GSM-900 channel 1004 (931.0MHz)
> average         [min, max]      (range, stddev)
> +   1Hz         [-13, 19]       (32, 8.658517)
> overruns: 0
> not found: 0
>
> Best Regards.
>
> ------------------------------
> jiangwy
>
>  *From:* Andrey Sviyazov <andreysviyaz at gmail.com>
> *Date:* 2013-08-03 00:54
> *To:* wyjiang <wyjiang at ljshuoda.com>
> *CC:* UmTRX <umtrx at lists.osmocom.org>; Alexander Chemeris<alexander.chemeris at gmail.com>
> *Subject:* Re: Re: The Difference of Signal Strength From Two Channels on
> The Same Board is Big
>  Hi Jiang Wenyi.
>
>  Please double check that both UmTRX's runs with the same FPGA images
> (and firmware).
> If absolutely the same then seems one board is broken.
> Please double check it also by some other tests to be sure before send to
> us for repair.
>
>  Best regards,
> Andrey Sviyazov.
>
>
> 2013/8/2 jiangwy <wyjiang at ljshuoda.com>
>
>> **
>> I try another UmTRX board, and it's OK. The difference from the channel 0
>> and 1 is very small.
>>
>> ------------------------------
>> jiangwy
>>
>>  *From:* Alexander Chemeris <alexander.chemeris at gmail.com>
>> *Date:* 2013-08-02 17:30
>> *To:* wyjiang <wyjiang at ljshuoda.com>
>> *CC:* UmTRX <umtrx at lists.osmocom.org>
>> *Subject:* Re: Re: The Difference of Signal Strength From Two Channels
>> on The Same Board is Big
>>   Ok.
>>
>> Also check that a correct input is selected on both chips
>> (--lms-get-rx-lna option).
>>
>>
>> Then, could you check whether this is consistent among both UmTRX you have?
>>
>> On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> > I use the following command
>> >
>> > ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
>> >
>> > the outputs are all the same ( 15 ).
>> >
>> > ________________________________
>> > jiangwy
>> >
>> > From: Alexander Chemeris
>> > Date: 2013-08-02 16:20
>> > To: wyjiang
>> > CC: UmTRX
>>
>> > Subject: Re: The Difference of Signal Strength From Two Channels on The Same
>> > Board is Big
>> > Hi Jiang,
>> >
>> > Are you sure you're setting Rx gain properly for both channels?
>> > I recommend you to use umtrx_lms.py script from this repository to
>> > check Rx LNA and Rx VGA settings for both LMS chips:
>> > https://github.com/fairwaves/umtrx_scripts
>> >
>> > On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote:
>> >> Hi Alexander Chemeris,
>> >>
>>
>> >> According to rx_multi_samples , I write a program to receive samples from
>> >> two channels on the same board.
>> >> The program receive samples from 2 channels and calculate the signal
>> >> strength respectively. The signal is from a BTS arround.
>> >> I find the difference of signal strength is very big, about 20dB, and
>> >> channel 1 is bigger than channel 0.
>> >> I  exchange the antenna and feeder of the them, but the result is same.
>> >> I think there is some problem, but I cann't find it.
>> >> Would you please give me some sugguestion?
>> >>
>> >> Best Regards.
>> >>
>> >> ________________________________
>> >> Jiang Wenyi
>> >
>> >
>> >
>> > --
>> > Regards,
>> > Alexander Chemeris.
>> > CEO, Fairwaves LLC / ??? ???????
>> > http://fairwaves.ru
>> >
>>
>>
>>
>> --
>> Regards,
>> Alexander Chemeris.
>> CEO, Fairwaves LLC / ??? ???????
>> http://fairwaves.ru
>>
>>
>
>


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