Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Marcus D. Leech
On 10/09/2013 11:20 AM, Nemanja Savic wrote: Thank you Marcus, I think I can say that i learned something today. Just for clarification: USRP or UHD knows the gain of all components in the rx chain of wbx. If i specify for example 12 db of gain, and the gain of the chain without attenuator is f

Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Nemanja Savic
Thank you Marcus, I think I can say that i learned something today. Just for clarification: USRP or UHD knows the gain of all components in the rx chain of wbx. If i specify for example 12 db of gain, and the gain of the chain without attenuator is for example 25 db, it will try to set attenuation

Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Marcus D. Leech
On 10/09/2013 11:03 AM, Nemanja Savic wrote: You are right Marcus, but it is negative gain, and I wonder why USRP source allows me to specify more than 20 db of gain for wbx, without any warning. In fact what happens when u specify some gain value, how is configuration of the path set? Thanks

Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Nemanja Savic
You are right Marcus, but it is negative gain, and I wonder why USRP source allows me to specify more than 20 db of gain for wbx, without any warning. In fact what happens when u specify some gain value, how is configuration of the path set? Thanks On Wed, Oct 9, 2013 at 4:55 PM, Marcus D. Leech

Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Marcus D. Leech
On 10/09/2013 10:51 AM, Nemanja Savic wrote: Hi, as far as I can see the only thing on wbx board that has adjustable feature in rx path is attenuator, everything else has fixed gain. Am I missing something here? Best and thanks, Nemanja The way variable gain is nearly-universally implemente

Re: [Discuss-gnuradio] USRP1 gain

2013-10-09 Thread Nemanja Savic
Hi, as far as I can see the only thing on wbx board that has adjustable feature in rx path is attenuator, everything else has fixed gain. Am I missing something here? Best and thanks, Nemanja On Thu, Sep 19, 2013 at 5:32 PM, Marcus D. Leech wrote: > The WBX has 31.5dB gain control in the RX p

Re: [Discuss-gnuradio] USRP1 gain

2013-09-19 Thread Nemanja Savic
Ok, but as far as I have seen it is fixed and the only adjustable gain should be at PGA in front of the adc. Am i right? On Thu, Sep 19, 2013 at 5:10 PM, Marcus D. Leech wrote: > On 09/19/2013 11:03 AM, Nemanja Savic wrote: > > Hi ll guys, > > I am using for my application usrp1 and wbx board

Re: [Discuss-gnuradio] USRP1 gain

2013-09-19 Thread Marcus D. Leech
On 09/19/2013 11:03 AM, Nemanja Savic wrote: Hi ll guys, I am using for my application usrp1 and wbx board. From the documentation I got that maximum amplification value of 20 db, but in my flowgraph I am able to specify without problems more gain for usrp source block. If I put >20 db I real

Re: [Discuss-gnuradio] USRP1 gain

2013-09-19 Thread Marcus D. Leech
The WBX has 31.5dB gain control in the RX path. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org On Sep 19, 2013, at 8:21 AM, Nemanja Savic wrote: > Ok, but as far as I have seen it is fixed and the only adjustable gain should > be at PGA in front of th

[Discuss-gnuradio] USRP1 gain

2013-09-19 Thread Nemanja Savic
Hi ll guys, I am using for my application usrp1 and wbx board. From the documentation I got that maximum amplification value of 20 db, but in my flowgraph I am able to specify without problems more gain for usrp source block. If I put >20 db I really see changes in noise level, which means that so