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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+Raspberry\s+PI\s+\/\s+Wall\s+wart\s+RFI\s*$/: 15 ]

Total 15 documents matching your query.

1. [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: David Gottschalk <dave@highredline.com>
Date: Fri, 2 Apr 2021 20:15:32 -0400
I'm wondering if anyone has had success finding a wall wart for a Raspberry Pi that doesn't make horrific RFI on HF (or really any switch mode power supply that isn't noisy!) I recently discovered th
/archives//html/RFI/2021-04/msg00004.html (7,722 bytes)

2. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 2 Apr 2021 17:49:35 -0700
That's because it's a switch-mode power supply. What voltage and current? Depending on that, it may be possible to re-purpose an old linear wall wart. Also, study my tutorials on chasing and killing
/archives//html/RFI/2021-04/msg00005.html (8,589 bytes)

3. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: N4ZR <n4zr@comcast.net>
Date: Fri, 2 Apr 2021 22:30:39 -0400
Jameco has a bunch of 5 and 12-volt linear wall warts for quite reasonable prices.  For example, their 5V unregulated 800 ma wall wart is $3.90, and a 12V 2 amp unit is $13.95.  There are a lot in be
/archives//html/RFI/2021-04/msg00006.html (10,299 bytes)

4. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Gary Johnson <gwj@wb9jps.com>
Date: Fri, 2 Apr 2021 19:40:11 -0700
Yes... Apple adapters are excellent. Heres a detailed report. Other tested and recommended devices are also listed on my RFI page. http://wb9jps.com/Gary_Johnson/RFI_files/Apple_A1401_12W_USB_adapter
/archives//html/RFI/2021-04/msg00007.html (7,540 bytes)

5. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Dave <rocketnj@gmail.com>
Date: Fri, 2 Apr 2021 22:44:53 -0400
They recommend 2.5 amps for a Pi4 Dave wo2x Sent from my waxed string and tin cans. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mai
/archives//html/RFI/2021-04/msg00008.html (10,735 bytes)

6. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Jim Rhodes <jimk0xu@gmail.com>
Date: Fri, 2 Apr 2021 22:46:17 -0500
Yes, at least 2.5 amps of regulated 5 V with a USB-C connector. -- Jim K0XU jim@rhodesend.net _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesti
/archives//html/RFI/2021-04/msg00009.html (11,974 bytes)

7. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 2 Apr 2021 22:22:49 -0700
Nameplate ratings are often worst case, CYA. I strongly recommend putting a good ammeter inline and see what actually happens as you exercise the Pi. You'll notice that recommendation in those tutori
/archives//html/RFI/2021-04/msg00010.html (8,535 bytes)

8. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 2 Apr 2021 22:41:24 -0700
Regulation throws another potential monkey-wrench into the works -- unless you get a very good one, they also tend to be noisy. Like Gary's observation of Apple PSU's, I've found Lenovo's to also be
/archives//html/RFI/2021-04/msg00011.html (8,802 bytes)

9. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Joseph Bouchard <joek1vw@gmail.com>
Date: Sat, 3 Apr 2021 08:16:25 -0400
We have a bunch of Raspberry Pi 3B at work which are powered off the USB port of the Dell monitor they are plugged into, so I think the draw is quite low on a bare Pi. A standard USB port provides 50
/archives//html/RFI/2021-04/msg00012.html (9,634 bytes)

10. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: David Gottschalk <dave@highredline.com>
Date: Sat, 3 Apr 2021 09:03:54 -0400
Thanks Jim. Some others have also already suggested a linear power supply. I'll probably try that, but I'm strongly considering just moving my antenna much further away from my house, so I can spend
/archives//html/RFI/2021-04/msg00013.html (11,002 bytes)

11. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: David Gottschalk <dave@highredline.com>
Date: Sat, 3 Apr 2021 09:04:26 -0400
Are you saying these are quiet power supplies? Not sure I follow the suggestion. Thanks. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.co
/archives//html/RFI/2021-04/msg00014.html (11,864 bytes)

12. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Dave Cole <dave@nk7z.net>
Date: Sat, 3 Apr 2021 07:17:29 -0700
Do all three actions, look over Jim's papers, get a linear power supply, and move your loop as far from anything as possible. Many years ago, while vetting the use of a loop as a RX antenna, I did a
/archives//html/RFI/2021-04/msg00015.html (13,411 bytes)

13. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: "Lloyd - N9LB" <lloydberg@tds.net>
Date: Sat, 3 Apr 2021 09:23:36 -0500
QSL on everything. Also, put a "common mode choke" in that feedline - may two chokes, one at the entrance to your house and another out at the antenna. Do all three actions, look over Jim's papers, g
/archives//html/RFI/2021-04/msg00016.html (13,626 bytes)

14. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: Alex <alex@kr1st.com>
Date: Sat, 03 Apr 2021 11:41:38 -0400
Hi David, Check out Argon One power supplies on Amazon specifically for the Pi. I've tried several power supplies that caused noise on the USB ports to the SDR's that were hanging off the RPi 3B and
/archives//html/RFI/2021-04/msg00017.html (12,709 bytes)

15. Re: [RFI] Raspberry PI / Wall wart RFI (score: 1)
Author: David Gottschalk <dave@highredline.com>
Date: Wed, 7 Apr 2021 13:48:42 -0400
Thank you Gary for this tip. I actually had one of these apple adapters. I replaced the PI power supply with these, and the noise level dropped dramatically! Very much appreciate you recommended this
/archives//html/RFI/2021-04/msg00024.html (8,974 bytes)

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