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
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@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
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@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
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@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@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 / ООО УмРадио http://fairwaves.ru
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@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@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 / ООО УмРадио http://fairwaves.ru
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@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@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 / ООО УмРадио http://fairwaves.ru
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@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@gmail.com *Date:* 2013-08-02 17:30 *To:* wyjiang wyjiang@ljshuoda.com *CC:* UmTRX umtrx@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@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@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 / ООО УмРадио http://fairwaves.ru
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
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@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@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@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 / ООО УмРадио http://fairwaves.ru
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@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@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@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 / ООО УмРадио http://fairwaves.ru
Андрей, напиши ему свой адрес? Меня в копию поставь.
On Sat, Aug 3, 2013 at 6:48 AM, jiangwy wyjiang@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: 29930.09The 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@gmail.com *Date:* 2013-08-03 00:54 *To:* wyjiang wyjiang@ljshuoda.com *CC:* UmTRX umtrx@lists.osmocom.org; Alexander Chemerisalexander.chemeris@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@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@gmail.com *Date:* 2013-08-02 17:30 *To:* wyjiang wyjiang@ljshuoda.com *CC:* UmTRX umtrx@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@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@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 / ООО УмРадио http://fairwaves.ru
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
-
Alexander Chemeris -
Andrey Sviyazov -
jiangwy