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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+48v\s+DC\s+Clean\s+Power\s+Supply\s*$/: 14 ]

Total 14 documents matching your query.

1. [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim McCook <w6ya@cox.net>
Date: Wed, 25 Mar 2020 15:50:22 +0000
My neighbor is throwing RFI out that affects 15 and 10m bands.  We finally traced the source to a Unifi US-8-60 internet switch that uses a separate 48v power source.  Naturally it's a dreaded switch
/archives//html/RFI/2020-03/msg00054.html (6,748 bytes)

2. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Gedas <w8bya@mchsi.com>
Date: Wed, 25 Mar 2020 11:55:39 -0400
We need to know the current rating. years ago I have seen a handful of huge wall-warts that were linear and 48 VDC but limited to ~1A. Gedas, W8BYA EN70 Gallery at http://w8bya.com Light travels fast
/archives//html/RFI/2020-03/msg00055.html (8,291 bytes)

3. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Chuck Gooden <Chuck.Gooden@comcast.net>
Date: Wed, 25 Mar 2020 11:45:23 -0500
Jim, I am having the similar issue at ~3.588 Mhz  issue.   If you have a small radio the noise should be readily found near this freq. It does drift slightly when the switch is first turned on I repl
/archives//html/RFI/2020-03/msg00056.html (9,603 bytes)

4. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim McCook <w6ya@cox.net>
Date: Wed, 25 Mar 2020 17:24:26 +0000
Gedas, I forgot to mention that it's a 60w switch, so most likely a 2w supply would do the job.  Chuck seems to have the answer... in that the problem is internal with the switch itself.  That sugges
/archives//html/RFI/2020-03/msg00057.html (7,610 bytes)

5. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 25 Mar 2020 10:39:10 -0700
I suggest that you study the techniques in this app note that I produced for National Contest Journal. Chokes on cables connected to the switch may be able to knock the noise down enough that it isn'
/archives//html/RFI/2020-03/msg00058.html (9,012 bytes)

6. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Chuck Gooden <Chuck.Gooden@comcast.net>
Date: Wed, 25 Mar 2020 13:34:50 -0500
Jim, The 60 watts is due to the  switch supporting 4 POE ports at ~1/2 amp a port + some power overhead for the switch it self.  They do have a 8 port switch I think that does not support POE that us
/archives//html/RFI/2020-03/msg00060.html (9,007 bytes)

7. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Chuck Gooden <Chuck.Gooden@comcast.net>
Date: Wed, 25 Mar 2020 13:39:07 -0500
Jim, Can you check ~3.588 Mhz and see if you have a strong noise sinal near this frequency too.  Just want to make sure both switches are working similar. Thanks, Chuck K9LC The 60 watts is due to th
/archives//html/RFI/2020-03/msg00061.html (9,765 bytes)

8. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim McCook <w6ya@cox.net>
Date: Wed, 25 Mar 2020 18:40:04 +0000
Jim, thanks for the ideas.  I'll look through that NCJ article again.  Addressing a possible common mode problem is a good idea.  That makes perfect sense.  Paul at ARRL thought so, too.  My real cha
/archives//html/RFI/2020-03/msg00062.html (7,983 bytes)

9. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 25 Mar 2020 12:12:39 -0700
On 3/25/2020 11:40 AM, Jim McCook wrote: Jim, thanks for the ideas.  I'll look through that NCJ article again. Addressing a possible common mode problem is a good idea.  That makes perfect sense.  Pa
/archives//html/RFI/2020-03/msg00063.html (9,946 bytes)

10. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim McCook <w6ya@cox.net>
Date: Wed, 25 Mar 2020 19:25:01 +0000
Chuck, I hear no sign of this noise anywhere on 80m.... or even up in the SSB portion.  Definitely nothing on 3.588 or nearby. I just rechecked my own noise from this device that we confirmed by powe
/archives//html/RFI/2020-03/msg00064.html (8,032 bytes)

11. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Clay Autery <KY5G@montac.com>
Date: Wed, 25 Mar 2020 15:44:13 -0500
More than likely, it is 48vdc for the POE function, and uses a buck regulator or similar internally to drop the voltage to something lower like 12vdc or 5 vdc (or both) to run the electronics. ______
/archives//html/RFI/2020-03/msg00065.html (11,778 bytes)

12. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Clay Autery <KY5G@montac.com>
Date: Wed, 25 Mar 2020 15:42:12 -0500
I have XP Power Model AEB100PS48, 48vdc switching PSUs (resemble a laptop PSU) that are pretty stinkin' quiet.  Don't even HAVE to have torroids on the input/output. I loathe switchers, but I didn't
/archives//html/RFI/2020-03/msg00066.html (9,305 bytes)

13. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim McCook <w6ya@cox.net>
Date: Fri, 3 Apr 2020 19:10:17 +0000
Regarding my March 25 post about RFI from a Unifi US-8-60w internet switch on 10 meters:  The neighbor just called for a test and the big noise source is gone.  Apparently his IT guy found a separate
/archives//html/RFI/2020-04/msg00017.html (7,286 bytes)

14. Re: [RFI] 48v DC Clean Power Supply (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 3 Apr 2020 12:28:22 -0700
Great news, Jim! We should always be calling vendors/mfrs to fix problems like this. 73, Jim K9YC On 4/3/2020 12:10 PM, Jim McCook wrote: Regarding my March 25 post about RFI from a Unifi US-8-60w in
/archives//html/RFI/2020-04/msg00018.html (7,481 bytes)

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