Mike, If you increase the buffer size to the maximum do you still get a burst, if so does it correspond to the buffer length? Sadly no errors in the logfile. Simon Brown,

USB 2 1.5 MHz BW Half Duplex. Bursting. Log attached. On 3/22/2019 7:56 AM, Simon Brown wrote:

Ah, Thanks. Really looks like the API is not returning any errors, this has to be their driver. Simon Brown, G4ELI www.sdr-radio.com

Hi, With USB2 - you are running in full duplex. Can you try this in half duplex please? I’m only seeing some receive errors, I want to isolate this. So let’s try half duplex, let me know

yes, FT-817 and/or Spec An or FUNcube Pro+. -- 73, Mike, N1JEZ "A closed mouth gathers no feet"

OK, Thanks. Were you getting the bursting effect on all of the logfiles you attached? Simon Brown, G4ELI www.sdr-radio.com

both separate rx and Spec analyser

Hi, How are you detecting the bursting effect – with a separate receiver? Simon Brown, G4ELI www.sdr-radio.com

Simon, 2 logs attached. They are both at 1.5 MHz on the same machine. The USB3 port log has glitches in the transmit stream, but no actual bursts (on/off). The USB 2 log has the bursts. Hope this

this is 2.1Mhz bw without any firewall on. I get the odd click on tx

Simon, Would you like a debug with Mcafee uninstalled and windows defender FW on ? It will take a while to get rid of mcafee. Regards Adrian

Simon, This is working with mcafee fw off as well.

Simon, This is working with windows defender private firewall off. Mcafee on. Regards Adrian

Hi Adrian, I am desperate to get the DebugView output from you. Simon Brown, G4ELI www.sdr-radio.com

Simon, with 3.06 and my PlutoSDR I was getting the bursting at the lowest bandwidths. Changing the buffer just resulted in different lengths of bursts. This was on an old AMD laptop and brand new HP

didn't notice as i was on my phone :)

WRONG WRONG WRONG he had distorted audio cause he used fm bw 12 kc or so (wfm is not bfm!!) with switching to bfm the distortion is gone (I AM SURE ON THIS!!!) i looked his

Try attenuating the input to the dongle with hardware. Steve m0zeh

Hi All, If you have the Pluto ‘bursting’ at lower bandwidths (< 2MHz) during TX please run Debug View https://www.sdr-radio.com/Support/Diagnostics#DebugView and transmit. I’m hoping there

Thanks for all the interest. The unit has been sold. Stefan