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Re: RFI from raspberry 4B

 

With the Raspberry Pi 4B? I have always used the official Pi wall wart PS.? It is recommended that 5.1 at 3A be supplied to the Pi4's USB-C port, that supply meets that criteria.? In the past they have been readily available for about $7.99.? I have not had any issues with excessive RFI.? I have seen some 5v and 12v wall warts (switching supplies) that were so noisy that I had to remove them from service and put them in the trash because they even interfered with strong local AM stations.


Re: RFI from raspberry 4B

 

On Fri, Mar 4, 2022 at 04:57 PM, Ken N2VIP wrote:
With the power supply attached to the GPIO pins, your RTL SDR dongle is probably always powered on, as confirmed by the RFI being generated if the RPi itself is on or off.
I think you are onto something as with the RPi off but powered through the GPIO, I get noise with the SDR dongle connected but not with the WIFI dongle connected. So obviously it might well be the dongle, I will try to connect it to a laptop to see if the same issue arises. It is at the end of a long USB cable, may the USB cable is acting as an antenna ?

My shack is at the top floor of a 4 storey building. I don't have a reliable RF earth up there, if I could earth the SDR dongle, may be it would be easier!!!

73,

Yannig - F4IUJ


Re: BAP on Intel Linux?

 

Thank you Jasn for the hard work put into the BAP and getting it to work =)?? A lot of your time has been put into this project and you have done well =)?? My hat is off to you for the great job and effort into this project =)

I may look into the project ..... I too has been many years from the day of BASIC and MS DOS programming ( yes at the start of the BASIC into the public community =)?? Think I remember you saying it was in C++ language? .... Jason ???


On Fri, Mar 4, 2022 at 7:13 AM km4ack <jason.oleham@...> wrote:
Guys I have no intention of tackling x86 machines right now. Between my day job, the channel and Build a Pi, I just don't have the time to support yet another version. With that said, my code is available as open source. Anyone can fork the project and start modifying the code to support x86. Many of the applications are built from source and will require little to no work. The code is pretty well documented so it shouldn't be too terribly difficult to follow. I'll be happy to assist anyone who has questions about the flow of the code. The project is pretty mature at this point but remember that I have no formal programming training since high school and that was a long time ago. If I can figure it out, you can as well!
--
73, de KM4ACK

--
73's Pat? N5VMO



Re: RFI from raspberry 4B

 

¿ªÔÆÌåÓý

With the power supply attached to the GPIO pins, your RTL SDR dongle is probably always powered on, as confirmed by the RFI being generated if the RPi itself is on or off.

can you borrow a different dongle and try it - preferably from a different source/manufacturer?

Can you try powering the RPi from a conventional power supply connected to the USB-C connector?

Powering the RPi thru the GPIO pins *should* be fine, but who knows?

Ken, N2VIP

On Mar 4, 2022, at 05:54, Yannig - F4IUJ via groups.io <yannig.robert@...> wrote:

?Hello all,

My raspberry Pi is creating so much RFI that I need to switch it off to traffic... That bugs me and I am 90% sure that the culprit is the USB bus. As you all seem to be getting on well with your Pis, I must be doing something wrong...

My setup at the moment :
  • A small 5V switch mode supply that I bought to replace the noisy and underpowered supply I had before. I initially thought that it was the culprit but no it is not as if I run it alone I am fine...
  • The supply is directly connected to the appropriate pins of the GPIO of the Raspberry. That is still fine
  • Now starts the weirdness...
  • If I plug my RTL-SDR or my WIFI dongle into the raspberry USB port, I become deaf as horrendous RFI appears in the shack, it is like trying to have a conversation in a noisy night club, hopeless!!!
    • It doesn't matter if the raspberry is switched on or off, it still happens
    • If I use the USB 2.0 port instead of the 3.0 may be it is a little bit better but it still is terrible

I am stuck, any suggestion to make some progress is welcome...

73

Yannig - F4IUJ


Re: Workaround for Pi 4 "Lagging Chromium" and "Conky Positioning" issues #conky #Chromium

 

Pi OS 64bit running on a Pi 4 4GB

A bit more experimenting this morning. My suspicion about VNC was incorrect. I made these changes to the /boot/config.txt file.

Uncomment the following lines:
framebuffer_width=1920
framebuffer_height=1080
Note: you can change the resolution here to suit your needs.

Uncomment this line:
hdmi_force_hotplug=1

Comment out these two lines:
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2

After a reboot, Conky started on the right hand side and Chromium was no longer sluggish. My new guess is that something with the dtoverlay causes Chromium to be sluggish in a VNC only environment. What I don't know yet is what side effects may exist by commenting out the dtoverlay lines. If I run into any, I'll report them. If you guys run into any, please report.

As always, I recommend backing up your pi before making changes....just in case. I made a goof in my initial edits of the config.txt file which left me unable to VNC into the Pi. Had to ssh in to fix.

--
73, de KM4ACK
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Re: Workaround for Pi 4 "Lagging Chromium" and "Conky Positioning" issues #conky #Chromium

Wally Tuck
 

I tried using firefox-esr over chromium because I don't like anything google and had far more problems.? 30 minutes later I bit my pride, locked down chromiun and put it back into service.


On Fri, Mar 4, 2022 at 5:50, km4ack
<jason.oleham@...> wrote:
Dan,

Thanks for the testing and the detailed explanation. I have been extremely frustrated with Chromium since Bullseye came out. I never had this issue in Buster. I suspect it is something in VNC causing the issue and have been hoping a fix would be released. I swapped to firefox as my default browser. It's easy to install:
sudo apt install firefox-esr
then make it the default browser by running
xdg-settings set default-web-browser firefox-esr.desktop
I also changed some settings (can't remember specifics) in the /boot/config file to get conky to always launch on the right side of the screen.

Thanks again for the write up. Always great to see multiple solutions for a problem :-)

--
73, de KM4ACK
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Re: Argon One case and poor WLAN

 

¿ªÔÆÌåÓý

Hi Kevin,
Thanks a lot, I will try out this weekend and come back with a feedback

Klaus, DC2JR?

Von meinem iPhone gesendet

Am 04.03.2022 um 12:57 schrieb Kevin <kd9efv@...>:

?Both options will disable the on-board Wifi.
The Hotspot will use the dongle if it is available, as to hotspot auto-starting if there isn't a local wifi network, I haven't tested, but it does work manually.

Kevin -- KD9EFV


Re: Can¡¯t get Pat winking to work ?

 

Ptt is set to true with ?no luck?


Re: BAP on Intel Linux?

 

Guys I have no intention of tackling x86 machines right now. Between my day job, the channel and Build a Pi, I just don't have the time to support yet another version. With that said, my code is available as open source. Anyone can fork the project and start modifying the code to support x86. Many of the applications are built from source and will require little to no work. The code is pretty well documented so it shouldn't be too terribly difficult to follow. I'll be happy to assist anyone who has questions about the flow of the code. The project is pretty mature at this point but remember that I have no formal programming training since high school and that was a long time ago. If I can figure it out, you can as well!
--
73, de KM4ACK
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Re: #lab599 #tx-500 #digirig #ardop issues #lab599 #tx-500 #digirig #ardop

 

I don't own that radio but I am guessing that it is RFI getting into the Pi or radio that is causing it to lock up on transmit. Shorten every cable as much as possible and add ferrite beads to all of them.
--
73, de KM4ACK
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Re: Can¡¯t get Pat winking to work ?

 

In Pat Menu, click on Manage Pat Winlink->Set ARDOP PTT. Set this to true and test your PTT again.
--
73, de KM4ACK
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Re: Update Build a Pi. #bap

 

I would flash a new card and start over. Your old system is probably running Buster and Bullseye is the latest available. The Pi foundation does not recommend upgrading from Buster to Bullseye as many things changed under the hood that could cause conflicts.
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73, de KM4ACK
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Re: #gps #bullseye #gps #bullseye

 

got this figured out... found a substream on here where, when using the update tool just enter "*" in the ip address... i was entering?the ip address for the raspberry pi... but when using the commands in the terminal window, it still wouldnt?work... i have a grid square now... and it's the right one. so i think i am good...?

-Jon


Re: Multiple Apps using Sound Device at the same time

 

This is possible but an advanced setup. Try pointing one of the applications to the actual sound card and the other to "pulse". Then open pulse controls from the Pi menu and link the second (pulse) card to the actual sound card. I haven't tested this in a while but this should point you in the right direction. A little experimenting may be required to get the results you want.

--
73, de KM4ACK
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Re: Build a Pi 64 bit Beta Testers Needed

 

Hi Jason:

Yes, possible & probable!

I should have looked closer.

Thanks,
--
Jeff Marden
N1JCM


Re: Workaround for Pi 4 "Lagging Chromium" and "Conky Positioning" issues #conky #Chromium

 

Dan,

Thanks for the testing and the detailed explanation. I have been extremely frustrated with Chromium since Bullseye came out. I never had this issue in Buster. I suspect it is something in VNC causing the issue and have been hoping a fix would be released. I swapped to firefox as my default browser. It's easy to install:
sudo apt install firefox-esr
then make it the default browser by running
xdg-settings set default-web-browser firefox-esr.desktop
I also changed some settings (can't remember specifics) in the /boot/config file to get conky to always launch on the right side of the screen.

Thanks again for the write up. Always great to see multiple solutions for a problem :-)

--
73, de KM4ACK
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Re: BAP on Intel Linux?

 
Edited

IIRC, BAP is on github; it might well be as simple as forking it, and doing a search/replace to change the architecture specified in the scripts.

I might have a look myself when i have a moment.

(EDIT) - following up on Julian's observation on his attempt, the scripts seem to be mainly APT based, so it's likely to just be a matter of fine-tuning them rather than needing the fullblown architecture change I'd envisioned.

73
Phil
2E0HGU


Re: #gps #bullseye #gps #bullseye

 

added UDP port 11123 to my router under the raspi ip address listed for wireless. still can't get it to bring up a GPS on conky. just says "NO GPS".?

when i run cgps, no data entered?into the fields... what am i missing?

-Jon



Re: Argon One case and poor WLAN

 

Both options will disable the on-board Wifi.
The Hotspot will use the dongle if it is available, as to hotspot auto-starting if there isn't a local wifi network, I haven't tested, but it does work manually.

Kevin -- KD9EFV


RFI from raspberry 4B

 

Hello all,

My raspberry Pi is creating so much RFI that I need to switch it off to traffic... That bugs me and I am 90% sure that the culprit is the USB bus. As you all seem to be getting on well with your Pis, I must be doing something wrong...

My setup at the moment :
  • A small 5V switch mode supply that I bought to replace the noisy and underpowered supply I had before. I initially thought that it was the culprit but no it is not as if I run it alone I am fine...
  • The supply is directly connected to the appropriate pins of the GPIO of the Raspberry. That is still fine
  • Now starts the weirdness...
  • If I plug my RTL-SDR or my WIFI dongle into the raspberry USB port, I become deaf as horrendous RFI appears in the shack, it is like trying to have a conversation in a noisy night club, hopeless!!!
    • It doesn't matter if the raspberry is switched on or off, it still happens
    • If I use the USB 2.0 port instead of the 3.0 may be it is a little bit better but it still is terrible

I am stuck, any suggestion to make some progress is welcome...

73

Yannig - F4IUJ