Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-31 Thread Marcus D. Leech via USRP-users
On 10/31/2017 02:14 PM, Oliver Wayne wrote: I run into the same issue while reading from the file. Even if I put in a higher sample rate while inputting to the File Sink (so I get the frequencies that I want), the device hits underflows while reading from the File Source because it can't sustai

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-31 Thread Oliver Wayne via USRP-users
I run into the same issue while reading from the file. Even if I put in a higher sample rate while inputting to the File Sink (so I get the frequencies that I want), the device hits underflows while reading from the File Source because it can't sustain that sample rate. Are there any other ways to

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-31 Thread Marcus D. Leech via USRP-users
On 10/31/2017 01:15 PM, Oliver Wayne wrote: Another thought I had -- because I don't anticipate my waveform changing much, is there a way to pre-record my waveform and transmit it continuously, which if I understand the problem correctly would avoid the underruns? Sure, just record it in a fi

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-31 Thread Oliver Wayne via USRP-users
Another thought I had -- because I don't anticipate my waveform changing much, is there a way to pre-record my waveform and transmit it continuously, which if I understand the problem correctly would avoid the underruns? On Mon, Oct 30, 2017 at 3:28 PM, Oliver Wayne wrote: > Hi Marcus, > > I swi

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-30 Thread Oliver Wayne via USRP-users
Hi Marcus, I switched to performance mode and got the same results. I'm running LDXE on this computer, so I changed it by editing /etc/init.d/cpufrequtils and setting GOVERNOR="performance", then using sysv-rc-conf to deactivate on-demand. On Mon, Oct 30, 2017 at 3:01 PM, Marcus D. Leech wrote:

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-30 Thread Marcus D. Leech via USRP-users
On 10/30/2017 02:54 PM, Oliver Wayne wrote: When I run perf top, I get libuhd.so.3.11 and libc-2.23.so taking up about 15% and 21% respectively, rising over time. This is at 10Msps. any thoughts? I've tried a few other things like setting otw_format=sc12 and setting the fr

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-30 Thread Oliver Wayne via USRP-users
When I run perf top, I get libuhd.so.3.11 and libc-2.23.so taking up about 15% and 21% respectively, rising over time. This is at 10Msps. any thoughts? I've tried a few other things like setting otw_format=sc12 and setting the frame size higher, but I haven't had any success. On Tue, Oct 24, 2017

Re: [USRP-users] Fwd: Removing DC offset on USRP B200

2017-10-24 Thread Marcus D. Leech via USRP-users
You could perhaps do a "perf top" and see what's consuming time. The Gnu Radio signal source blocks are not screamingly efficient, so it may be that they just aren't keeping up, although at 4Msps, you wouldn't expect them to be too stressed. On 2017-10-24 15:12, Oliver Wayne via USRP-users wrot