[Skimmertalk] 3D2AG node problems -- it's not an RP Power Supply issue, but something else

N4ZR n4zr at comcast.net
Wed Jul 14 08:29:28 EDT 2021

Oh, another thought - have you corresponded with Red Pitaya about this?  
I've found them responsive in the past.

73, Pete N4ZR
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On 7/14/2021 5:28 AM, Bob Wilson, N6TV wrote:
> Thanks for all the power supply suggestions, but at this point I'm 
> convinced there is nothing wrong with 3D2AG's power supply (he may 
> have been hearing the fan speed change in the NUC).  With Skimmer 
> terminated, I tried copying a large file from Windows to the RP using 
> the SCP command, while monitoring the Network throughput using the 
> Windows Performance Monitor.  The copy works for a little while, and 
> the transfer speed peaks at about 135 Mbps, then the SCP command seems 
> to hang for a few seconds, and then it aborts and reports "broken 
> pipe", and the Ethernet connection to the RP is reset (one of the RP's 
> LEDs goes out, then comes back after a little while).  I repeated this 
> a few times, and it stopped at different points, so it has nothing to 
> do with disk space or with SkimSrv, just network performance.
> Bottom line:  as soon as a large amount of data is being transferred 
> from PC to RP or vice versa, it only works for a short time, then the 
> connection is dropped.  We've tried different cables, and using the 
> Router as a switch, and using a separate standalone Ethernet switch, 
> and it made no difference.  This same configuration has been working 
> OK for months.
> Antoine noticed that the RP heat sink was not solidly seated (the 
> white plastic tabs that hold it against the chip were apparently not 
> pushed in all the way).  So perhaps this chip has  been overheated too 
> much, and now is only marginally functional.  He reapplied thermal 
> paste and properly seated the heatsink, but it didn't make any 
> difference, and xadc reports the temperature is OK.
> I think his RP is simply unfixable at this point, though there is a 
> slight chance this is really a Windows Update / Networking performance 
> issue and not an RP issue.  He has no other PC to test with.  Every 
> time he reboots Windows, extra "vEthernet" devices (virtual Network 
> switches) appear in his Network settings.  I disabled all of those and 
> "Hyper-V" settings, but it made no difference, the problems remain.
> It looks like 3D2AG's node is kaput until a new RP or new PC can be 
> obtained.
> 73,
> Bob, N6TV
> On Wed, Jul 14, 2021 at 1:32 AM Björn Ekelund <bjorn at ekelund.nu 
> <mailto:bjorn at ekelund.nu>> wrote:
>     I have been using no-name RP 3 power supplies with good results.
>     They are typically rated at 2.5A.
>     Some need the 5V cable run 4-5 times through a suitable (i.e.
>     active below 30MHz) clip-on ferrite to be completely quiet.
>     Björn
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