Re: [Discuss-gnuradio] Max Output Power from the LFTX
We are using almost the same IC in our product, as a driver for a transmitting coil in industrial environment, for material test, and we had never ever fail one of those. Must be around 4k or 5k of those ICs we have out in the field, and the only failures were two or three that came dead from the PCB manufacturer. Even a hard short never was able to kill one. Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Marcus D. Leech Sent: Friday, January 16, 2015 8:12 PM To: khalid.el-darymli; Michael Rahaim Cc: Discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX On 01/16/2015 02:08 PM, khalid.el-darymli wrote: Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid Interesting. The driver chip that's used, as a unity-gain differential-to-single-ended driver, is, according to the datasheets, pretty robust. So, it would be interesting to know exactly what the failure mode is. On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu mailto:mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude 1, the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting -28.13dBm, much less than what you said, I am not sure, why? Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ +7dBm is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Usually you just see, the IC is defective, that’s all, and this is what we already know anyway :) Ralph. From: discuss-gnuradio-bounces+ralph=schmid@gnu.org [mailto:discuss-gnuradio-bounces+ralph=schmid@gnu.org] On Behalf Of Marcus D. Leech Sent: Friday, January 16, 2015 8:59 PM To: khalid.el-darymli Cc: Discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX On 01/16/2015 02:54 PM, khalid.el-darymli wrote: I see. If you would like to diagnose the problem, we can ship you the malfunctioned daughterboard? Thanks, Khalid Thanks. I personally wouldn't have time/equipment to really diagnose it. So it would be up to Ettus RD as to whether they want it back to see what the failure mode is. I've been doing Ettus support for 6 years, and LF_TX are not generally items that show up with RMA requests very often. On Fri, Jan 16, 2015 at 4:17 PM, Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com wrote: On 01/16/2015 02:42 PM, khalid.el-darymli wrote: We were using only one Tx channel with the Subdev Spec in the USRP Sink is set to A:AB Could the failure be due to that the other (idle) Tx channel is left open circuit (i.e., not terminated by 50 ohms)? That seems quite unlikely. These aren't precious princess RF power transistors, but reasonably-robust differential-to-unbalanced drivers. I'd be very surprised if they couldn't handle an open-circuit condition. Khalid On Fri, Jan 16, 2015 at 3:41 PM, Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com wrote: On 01/16/2015 02:08 PM, khalid.el-darymli wrote: Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid Interesting. The driver chip that's used, as a unity-gain differential-to-single-ended driver, is, according to the datasheets, pretty robust. So, it would be interesting to know exactly what the failure mode is. On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu mailto:mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude 1, the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting -28.13dBm, much less than what you said, I am not sure, why? Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ +7dBm is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just
Re: [Discuss-gnuradio] Max Output Power from the LFTX
From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
We were using only one Tx channel with the Subdev Spec in the USRP Sink is set to A:AB Could the failure be due to that the other (idle) Tx channel is left open circuit (i.e., not terminated by 50 ohms)? Khalid On Fri, Jan 16, 2015 at 3:41 PM, Marcus D. Leech mle...@ripnet.com wrote: On 01/16/2015 02:08 PM, khalid.el-darymli wrote: Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid Interesting. The driver chip that's used, as a unity-gain differential-to-single-ended driver, is, according to the datasheets, pretty robust. So, it would be interesting to know exactly what the failure mode is. On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
Re: [Discuss-gnuradio] Max Output Power from the LFTX
://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio - ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
I see. If you would like to diagnose the problem, we can ship you the malfunctioned daughterboard? Thanks, Khalid On Fri, Jan 16, 2015 at 4:17 PM, Marcus D. Leech mle...@ripnet.com wrote: On 01/16/2015 02:42 PM, khalid.el-darymli wrote: We were using only one Tx channel with the Subdev Spec in the USRP Sink is set to A:AB Could the failure be due to that the other (idle) Tx channel is left open circuit (i.e., not terminated by 50 ohms)? That seems quite unlikely. These aren't precious princess RF power transistors, but reasonably-robust differential-to-unbalanced drivers. I'd be very surprised if they couldn't handle an open-circuit condition. Khalid On Fri, Jan 16, 2015 at 3:41 PM, Marcus D. Leech mle...@ripnet.com wrote: On 01/16/2015 02:08 PM, khalid.el-darymli wrote: Hi All, Just to update you in case somebody else comes across this problem. Following Mike's advice, we replaced the LFTX daughterboard with a new one. We're getting now 1 V p-p. This is around 4 dBm. Thanks very much for your help. Best regards, Khalid Interesting. The driver chip that's used, as a unity-gain differential-to-single-ended driver, is, according to the datasheets, pretty robust. So, it would be interesting to know exactly what the failure mode is. On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content
Re: [Discuss-gnuradio] Max Output Power from the LFTX
mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http
Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard
On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Thanks Mike. I appreciate your comment. I'll look into buying a new LFTX. Khalid On Tue, Jan 6, 2015 at 2:38 PM, Michael Rahaim mrah...@bu.edu wrote: Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator
Re: [Discuss-gnuradio] Max Output Power from the LFTX
mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Yes, it is 1 Mohm, and my probe is set to 1X.
Khalid
On Tue, Jan 6, 2015 at 3:33 PM, Nick Foster bistrom...@gmail.com wrote:
Is the input impedance of your scope 1Mohm or 50 ohms? You sure you have
the voltage multiplier (1x/10x) set correctly?
On Tue, Jan 6, 2015 at 11:01 AM, khalid.el-darymli
khalid.el-dary...@mun.ca wrote:
Trying setting a gain in your sink block of, let's say, 20dB, with a
magnitude of 0.9. What power output do you get? How are you measuring
power?
This gives me 23.2 mV (peak to peak). This is the reading I get from a
scope connected to a T. For the input ends of the T, one end is connected
to a 50-ohm terminator and the other end is connected to the output from
LFTX. This gives a power of: 30+10 log_10[{23.2e-03/[2*sqrt(2)]}^2/50]=
*-28.711* dBm.
What is your flow-graph actually doing? Have you tried both
connectors on the LFTX?
Simple, a signal source (Sine) block directly connected to a USRP Sink
block.
Yes, both connectors on the LFTX daughterboard give the same voltage
reading.
Thanks,
Khalid
On Tue, Jan 6, 2015 at 2:34 PM, Marcus D. Leech mle...@ripnet.com
wrote:
Output power is determined largely by baseband signal magnitude in
that case.
Yes, I understand. And I noticed that for baseband signal with an
amplitude * 1, * the pass-band signal gets clipped off. So I assume
that an amplitude of 1 for the baseband signal should deliver the maximum
output power (for the pass-band signal).
My question was, what is the maximum power one can get for the
pass-band signal output from LFTX? In your earlier reply, you said it is
around +7dBm, am I getting this right? In my case, for a baseband amplitude
of around 1, I am only getting *-28.13dBm*, much less than what you
said, I am not sure,* why?*
Thanks,
Khalid
For a magnitude of ~1, you should see maximum amplitude signals
coming out of it.
You could try setting gain, but on any platforms with VGAs in the DAC,
there's only about 6dB of gain range settable. Trying setting a gain in
your
sink block of, let's say, 20dB, with a magnitude of 0.9. What power
output do you get? How are you measuring power? What is your flow-graph
actually doing? Have you tried both connectors on the LFTX?
On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com
wrote:
Thanks Marcus for your reply.
Probably somewhere in the neighborhood of +7dBm, maybe a little more.
The LF/BASIC series have *no* gain in either path, so you're just
looked
at buffered ADC ouput.
So, ~ *+7dBm* is the max output power I supposed to get from the LFTX
daughterboard? How do I get that?
Since I am only getting -28.13 dBm, does that mean I have some issue
with my LFTX daughterboard?
Khalid
Output power is determined largely by baseband signal magnitude in
that case.
Message: 2
Date: Tue, 6 Jan 2015 10:13:45 -0330
From: khalid.el-darymli khalid.el-dary...@mun.ca
To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID:
CACdmG=zCHATiwrtv=wBVLwG0_
5GQr0y=wksequrcajrtuv5...@mail.gmail.com
Content-Type: text/plain; charset=utf-8
Hi,
What is the maximum output power from the LFTX daughterboard when used
with
the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
In GNU Radio with the USRP N200, we use a sinusoid with a frequency of
150
kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a
center
frequency of 5 MHz. When the output of LFTX is plugged into a scope
terminated with a 50-ohm terminator, the scope reads 24.8 mV
(peak-to-peak). This is around -28.13 dBm.
Is this the max power one can get out of the LFTX daughterboard?
Thanks.
Best regards,
Khalid
-- next part --
An HTML attachment was scrubbed...
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Message: 3
Date: Tue, 06 Jan 2015 08:48:08 -0500
From: Marcus D. Leech mle...@ripnet.com
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID: 54abe798.5060...@ripnet.com
Content-Type: text/plain; charset=UTF-8; format=flowed
On 01/06/2015 08:43 AM, khalid.el-darymli wrote:
Hi,
What is the maximum output power from the LFTX daughterboard when used
with the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Trying setting a gain in your sink block of, let's say, 20dB, with a
magnitude of 0.9. What power output do you get? How are you measuring
power?
This gives me 23.2 mV (peak to peak). This is the reading I get from a
scope connected to a T. For the input ends of the T, one end is connected
to a 50-ohm terminator and the other end is connected to the output from
LFTX. This gives a power of: 30+10 log_10[{23.2e-03/[2*sqrt(2)]}^2/50]=
*-28.711* dBm.
What is your flow-graph actually doing? Have you tried both connectors
on the LFTX?
Simple, a signal source (Sine) block directly connected to a USRP Sink
block.
Yes, both connectors on the LFTX daughterboard give the same voltage
reading.
Thanks,
Khalid
On Tue, Jan 6, 2015 at 2:34 PM, Marcus D. Leech mle...@ripnet.com wrote:
Output power is determined largely by baseband signal magnitude in that
case.
Yes, I understand. And I noticed that for baseband signal with an
amplitude * 1, * the pass-band signal gets clipped off. So I assume that
an amplitude of 1 for the baseband signal should deliver the maximum output
power (for the pass-band signal).
My question was, what is the maximum power one can get for the pass-band
signal output from LFTX? In your earlier reply, you said it is around
+7dBm, am I getting this right? In my case, for a baseband amplitude of
around 1, I am only getting *-28.13dBm*, much less than what you said, I
am not sure,* why?*
Thanks,
Khalid
For a magnitude of ~1, you should see maximum amplitude signals coming
out of it.
You could try setting gain, but on any platforms with VGAs in the DAC,
there's only about 6dB of gain range settable. Trying setting a gain in
your
sink block of, let's say, 20dB, with a magnitude of 0.9. What power
output do you get? How are you measuring power? What is your flow-graph
actually doing? Have you tried both connectors on the LFTX?
On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote:
Thanks Marcus for your reply.
Probably somewhere in the neighborhood of +7dBm, maybe a little more.
The LF/BASIC series have *no* gain in either path, so you're just
looked
at buffered ADC ouput.
So, ~ *+7dBm* is the max output power I supposed to get from the LFTX
daughterboard? How do I get that?
Since I am only getting -28.13 dBm, does that mean I have some issue
with my LFTX daughterboard?
Khalid
Output power is determined largely by baseband signal magnitude in
that case.
Message: 2
Date: Tue, 6 Jan 2015 10:13:45 -0330
From: khalid.el-darymli khalid.el-dary...@mun.ca
To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID:
CACdmG=zCHATiwrtv=wBVLwG0_
5GQr0y=wksequrcajrtuv5...@mail.gmail.com
Content-Type: text/plain; charset=utf-8
Hi,
What is the maximum output power from the LFTX daughterboard when used
with
the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150
kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center
frequency of 5 MHz. When the output of LFTX is plugged into a scope
terminated with a 50-ohm terminator, the scope reads 24.8 mV
(peak-to-peak). This is around -28.13 dBm.
Is this the max power one can get out of the LFTX daughterboard?
Thanks.
Best regards,
Khalid
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Message: 3
Date: Tue, 06 Jan 2015 08:48:08 -0500
From: Marcus D. Leech mle...@ripnet.com
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID: 54abe798.5060...@ripnet.com
Content-Type: text/plain; charset=UTF-8; format=flowed
On 01/06/2015 08:43 AM, khalid.el-darymli wrote:
Hi,
What is the maximum output power from the LFTX daughterboard when used
with the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
In GNU Radio with the USRP N200, we use a sinusoid with a frequency of
150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for
a center frequency of 5 MHz. When the output of LFTX is plugged into a
scope terminated with a 50-ohm terminator, the scope reads 24.8 mV
(peak-to-peak). This is around -28.13 dBm
Re: [Discuss-gnuradio] Max Output Power from the LFTX
one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Is the input impedance of your scope 1Mohm or 50 ohms? You sure you have
the voltage multiplier (1x/10x) set correctly?
On Tue, Jan 6, 2015 at 11:01 AM, khalid.el-darymli khalid.el-dary...@mun.ca
wrote:
Trying setting a gain in your sink block of, let's say, 20dB, with a
magnitude of 0.9. What power output do you get? How are you measuring
power?
This gives me 23.2 mV (peak to peak). This is the reading I get from a
scope connected to a T. For the input ends of the T, one end is connected
to a 50-ohm terminator and the other end is connected to the output from
LFTX. This gives a power of: 30+10 log_10[{23.2e-03/[2*sqrt(2)]}^2/50]=
*-28.711* dBm.
What is your flow-graph actually doing? Have you tried both connectors
on the LFTX?
Simple, a signal source (Sine) block directly connected to a USRP Sink
block.
Yes, both connectors on the LFTX daughterboard give the same voltage
reading.
Thanks,
Khalid
On Tue, Jan 6, 2015 at 2:34 PM, Marcus D. Leech mle...@ripnet.com wrote:
Output power is determined largely by baseband signal magnitude in
that case.
Yes, I understand. And I noticed that for baseband signal with an
amplitude * 1, * the pass-band signal gets clipped off. So I assume
that an amplitude of 1 for the baseband signal should deliver the maximum
output power (for the pass-band signal).
My question was, what is the maximum power one can get for the pass-band
signal output from LFTX? In your earlier reply, you said it is around
+7dBm, am I getting this right? In my case, for a baseband amplitude of
around 1, I am only getting *-28.13dBm*, much less than what you said, I
am not sure,* why?*
Thanks,
Khalid
For a magnitude of ~1, you should see maximum amplitude signals coming
out of it.
You could try setting gain, but on any platforms with VGAs in the DAC,
there's only about 6dB of gain range settable. Trying setting a gain in
your
sink block of, let's say, 20dB, with a magnitude of 0.9. What power
output do you get? How are you measuring power? What is your flow-graph
actually doing? Have you tried both connectors on the LFTX?
On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com
wrote:
Thanks Marcus for your reply.
Probably somewhere in the neighborhood of +7dBm, maybe a little more.
The LF/BASIC series have *no* gain in either path, so you're just
looked
at buffered ADC ouput.
So, ~ *+7dBm* is the max output power I supposed to get from the LFTX
daughterboard? How do I get that?
Since I am only getting -28.13 dBm, does that mean I have some issue
with my LFTX daughterboard?
Khalid
Output power is determined largely by baseband signal magnitude in
that case.
Message: 2
Date: Tue, 6 Jan 2015 10:13:45 -0330
From: khalid.el-darymli khalid.el-dary...@mun.ca
To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID:
CACdmG=zCHATiwrtv=wBVLwG0_
5GQr0y=wksequrcajrtuv5...@mail.gmail.com
Content-Type: text/plain; charset=utf-8
Hi,
What is the maximum output power from the LFTX daughterboard when used
with
the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
In GNU Radio with the USRP N200, we use a sinusoid with a frequency of
150
kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a
center
frequency of 5 MHz. When the output of LFTX is plugged into a scope
terminated with a 50-ohm terminator, the scope reads 24.8 mV
(peak-to-peak). This is around -28.13 dBm.
Is this the max power one can get out of the LFTX daughterboard?
Thanks.
Best regards,
Khalid
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Message: 3
Date: Tue, 06 Jan 2015 08:48:08 -0500
From: Marcus D. Leech mle...@ripnet.com
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX
daughterboard
Message-ID: 54abe798.5060...@ripnet.com
Content-Type: text/plain; charset=UTF-8; format=flowed
On 01/06/2015 08:43 AM, khalid.el-darymli wrote:
Hi,
What is the maximum output power from the LFTX daughterboard when used
with the USRP N200?
According to this datasheet [1], the N200 with the WBX daughterbaord
provide an output power of 15 dBm. However, when using the LFTX
daughterboard, I am getting a much less output power.
[1]
http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf
In GNU Radio with the USRP N200, we use a sinusoid with a frequency of
150 kHz and an amplitude of 0.98, fed
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike The only active component that can really fail on those boards is the differential-to-single-ended buffer. But you have to work failry hard to make those fail. Like maybe driving a dead short for an extended period, or a big ESD zap on the RF connector. On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,*why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com wrote: __ Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca mailto:khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org mailto:Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com mailto:wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com mailto:mle...@ripnet.com To: discuss-gnuradio@gnu.org mailto:discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com mailto:54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Hi Khalid, I had a similar issue with an LFTX that I had been working with for about two years. I actually had two boards running on separate USRP2's and both were working fine for quite a while, but I recently noticed that one had a drastically lower output range. I ended up replacing the LFTX and all is working well now, so I'm assuming it was a hardware issue that came up at some point. I didn't take the time to look for the problem, but I figured I'd share this info since what you're seeing might be a hardware issue rather than something you can resolve with settings. -Mike On Tue, Jan 6, 2015 at 12:59 PM, khalid.el-darymli khalid.el-dary...@mun.ca wrote: Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude * 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal). My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech mle...@ripnet.com wrote: Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Output power is determined largely by baseband signal magnitude in that case. Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio
Re: [Discuss-gnuradio] Max Output Power from the LFTX
Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. So, ~ *+7dBm* is the max output power I supposed to get from the LFTX daughterboard? How do I get that? Since I am only getting -28.13 dBm, does that mean I have some issue with my LFTX daughterboard? Khalid Message: 2 Date: Tue, 6 Jan 2015 10:13:45 -0330 From: khalid.el-darymli khalid.el-dary...@mun.ca To: Discuss-gnuradio@gnu.org discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: CACdmG=zCHATiwrtv=wBVLwG0_ 5GQr0y=wksequrcajrtuv5...@mail.gmail.com Content-Type: text/plain; charset=utf-8 Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid -- next part -- An HTML attachment was scrubbed... URL: http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html -- Message: 3 Date: Tue, 06 Jan 2015 08:48:08 -0500 From: Marcus D. Leech mle...@ripnet.com To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX daughterboard Message-ID: 54abe798.5060...@ripnet.com Content-Type: text/plain; charset=UTF-8; format=flowed On 01/06/2015 08:43 AM, khalid.el-darymli wrote: Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet [1], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when using the LFTX daughterboard, I am getting a much less output power. [1] http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center frequency of 5 MHz. When the output of LFTX is plugged into a scope terminated with a 50-ohm terminator, the scope reads 24.8 mV (peak-to-peak). This is around -28.13 dBm. Is this the max power one can get out of the LFTX daughterboard? Thanks. Best regards, Khalid Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have *no* gain in either path, so you're just looked at buffered ADC ouput. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
