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Pi 400 and RF

Michael WA7SKG All Messages By This Member #14084 Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day."
Kelly K7MHI All Messages By This Member #14085 Sounds like you have a harmonic or rf back into the touchpad.? Move it, lengthen cable or choke it see if that helps.? 73 Excuse typos and brevity, sent from a mobile device. toggle quoted message Show quoted text On Saturday, November 27, 2021, 9:51 AM, Michael WA7SKG <wa7skg@...> wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day."
Mark Griffith #14086 The Raspberry Pi's are very subseptible to RF.? The most likely way to correct it is RF chokes on the power supply cable and any cable between the Pi and the radio.? Maybe even the monitor cable although those are usually well shielded.? In my experience, the clamp on chokes don't seem to work very well, but the kind that you can split apart and wrap the cable around it to or three times has cleared up any problems I have seen. If that doesn't work, maybe a metal case for the Pi and perhaps some sleuthing to find out where the RF leak is in your setup. Good luck! Mark KD0QYN On Saturday, November 27, 2021, 11:51:17 AM CST, Michael WA7SKG <wa7skg@...> wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day."
Dave R All Messages By This Member #14087 Hello. I had similar issues and a couple of generic clamp-on ferrites fixed it for me. One on UTP ethernet cable, another on the 5Vdc power supply cable was all I needed. 73 toggle quoted message Show quoted text On Sat, Nov 27, 2021, 09:51 Michael WA7SKG <wa7skg@...> wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day."
Dave R All Messages By This Member #14088 No metal case a available for pi400. It's the pi4 built inside a keyboard.? It has a massive heatsink and no fans needed. 73 toggle quoted message Show quoted text On Sat, Nov 27, 2021, 10:21 Mark Griffith via <mdgriffith2003=[email protected]> wrote: The Raspberry Pi's are very subseptible to RF.? The most likely way to correct it is RF chokes on the power supply cable and any cable between the Pi and the radio.? Maybe even the monitor cable although those are usually well shielded.? In my experience, the clamp on chokes don't seem to work very well, but the kind that you can split apart and wrap the cable around it to or three times has cleared up any problems I have seen. If that doesn't work, maybe a metal case for the Pi and perhaps some sleuthing to find out where the RF leak is in your setup. Good luck! Mark KD0QYN On Saturday, November 27, 2021, 11:51:17 AM CST, Michael WA7SKG <wa7skg@...> wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day."
Chuck K4RGN All Messages By This Member #14089 Although it's not an issue for the OP, I found that the Pi's i2c bus is very susceptible to RF. Note that at VHF or UHF frequencies, an i2c ribbon cable of an unfortunate length can be especially troublesome. Since there was no good solution using a ferrite, I bought some fine copper mesh on eBay to put the Pi and its i2c-connected devices inside a Faraday cage. This worked. The long-term solution, though, was to use USB-connected devices instead of i2c-connected devices. USB isn't impervious to RF either, but its natural noise immunity appears to exceed i2c's.? 73 Chuck K4RGN
Tadd KA2DEW in NC Member Profile All Messages By This Member #14090 开云体育 Consider the antennas and coax also. Try putting a dummy load on the radio and see if the problem goes away. You might have a common current problem. ?Antennas that are in balanced or have an insufficient counterpoise can cause RFI to the equipment in the shack. The dead giveaway that it’s the antenna and not the coax is to put the dummy load out at the antenna. Tadd - KA2DEW? toggle quoted message Show quoted text On Nov 28, 2021, at 12:06 PM, Chuck K4RGN <K4rgn@...> wrote: ?Although it's not an issue for the OP, I found that the Pi's i2c bus is very susceptible to RF. Note that at VHF or UHF frequencies, an i2c ribbon cable of an unfortunate length can be especially troublesome. Since there was no good solution using a ferrite, I bought some fine copper mesh on eBay to put the Pi and its i2c-connected devices inside a Faraday cage. This worked. The long-term solution, though, was to use USB-connected devices instead of i2c-connected devices. USB isn't impervious to RF either, but its natural noise immunity appears to exceed i2c's.? 73 Chuck K4RGN
Charles Gallo All Messages By This Member #14091 开云体育 Yeah, EMI from large motors too — ? Charlie 73 de KG2V Http://www.thegallos.com toggle quoted message Show quoted text On Nov 28, 2021, at 12:06 PM, Chuck K4RGN <K4rgn@...> wrote: ?Although it's not an issue for the OP, I found that the Pi's i2c bus is very susceptible to RF. Note that at VHF or UHF frequencies, an i2c ribbon cable of an unfortunate length can be especially troublesome. Since there was no good solution using a ferrite, I bought some fine copper mesh on eBay to put the Pi and its i2c-connected devices inside a Faraday cage. This worked. The long-term solution, though, was to use USB-connected devices instead of i2c-connected devices. USB isn't impervious to RF either, but its natural noise immunity appears to exceed i2c's.? 73 Chuck K4RGN
Michael KJ7VID #14092 Michael, First thing I’d try is replacing the mouse.? Mike KJ7VID toggle quoted message Show quoted text On Sat, Nov 27, 2021 at 10:51 Michael WA7SKG <wa7skg@...> wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated. -- 73, Michael WA7SKG "Any day you do not learn one new thing is a wasted day." -- Sincerely, Mike _ KJ7VID 73
Bill Cromwell All Messages By This Member #14093 Hi, Just for my own curiosity is the offending radio in a plastic box or in a grounded metal box? 7, Bill KU8H bark less - wag more toggle quoted message Show quoted text On 11/27/21 12:51 PM, Michael WA7SKG wrote: Is anybody experiencing RF problems with the Raspberry Pi 400? I was recently gifted a Pi400 and loaded the HamPi distribution. I don't have RF problems with anything else in the shack, but when I transmit (so far only on 20 and 40 meters) the Pi400 goes nuts. Stuff jumps around on the screen, programs open and close and all matter of strange behavior. It's like there are multiple mouses screaming around randomly clicking on things. Nothing is connected to it, just the Pi400 with its stock mouse and power supply hooked to a generic monitor. It was on a small table several feet from the radio. There are four other computers in the shack and a variety of other things that are not affected at all. Thought appreciated.
Mike - KG0P All Messages By This Member #14094 I'm not sure a metal case would be the? answer. After all, the wires leading in and out of the case would just act as short antennas sending the RF to the Pi in spite of the case. I do like the idea of chokes, though.

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