Search String: Display: Description: Sort:

Results:

References: [ +from:xxw0qe@comcast.net: 71 ]

Total 71 documents matching your query.

61. Re: [RFI] Spectrum RFI Tracking (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 5 Feb 2017 08:57:25 -0700
Not really Paul. I think they are somewhat in denial and they believe the only way VDSL2 radiates is if there are wiring problems. I think a better statement is that if the wiring is perfect the RFI
/archives//html/RFI/2017-02/msg00004.html (8,938 bytes)

62. Re: [RFI] New Larger Fair-Rite #31 Toroid (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 26 Mar 2017 18:28:08 -0600
Dave, You might be surprised how accurate the following formula is: Toroid effectiveness is proportional to permeability*log(OD/ID)*length This is not an absolute number and it works for both donut a
/archives//html/RFI/2017-03/msg00088.html (9,993 bytes)

63. Re: [RFI] white noise starting at 3780 and up (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 16 Jul 2017 09:42:12 -0600
Rob, Take a look at http://www.w0qe.com/RF_Interference/spectrum_display_rfi_tracking.html I built a setup that works great for tracking via spectrum display. Tom, W0IVJ and I did exactly this with C
/archives//html/RFI/2017-07/msg00032.html (9,228 bytes)

64. Re: [RFI] white noise starting at 3780 and up (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 16 Jul 2017 12:39:40 -0600
Jim and others, I believe the problem has much to do with the cable from the DLSAM to the customer which over the years has been upgraded to be "data" compliant. I think this means more twists per in
/archives//html/RFI/2017-07/msg00036.html (10,065 bytes)

65. Re: [RFI] Power spectrum analyzer (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Thu, 14 Dec 2017 22:15:42 -0700
Scott, I have a Cotek S300 which I have used to power an HP 8591E SA with no issues at all. Larry, W0QE Would anyone have direct experience powering an AC operated spectrum analyzer from a vehicle? I
/archives//html/RFI/2017-12/msg00068.html (7,967 bytes)

66. Re: [RFI] Power spectrum analyzer (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Fri, 15 Dec 2017 00:23:52 -0700
BUT, it is not real small and weighs about 10 pounds.  I believe it was originally designed for ambulance service.  It is only 300W but if that is enough it works great. Larry Thanks! Jim ___________
/archives//html/RFI/2017-12/msg00071.html (8,020 bytes)

67. Re: [RFI] Bulk order source for Ferrite beads? (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 3 Feb 2019 08:06:01 -0700
Jim, I respectfully disagree with your comment about 61 material cores not being useful at HF.  For transmitting applications they are quite valuable.  The low Q impedance provided by 31 materials is
/archives//html/RFI/2019-02/msg00006.html (10,997 bytes)

68. Re: [RFI] Bulk order source for Ferrite beads? (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 3 Feb 2019 13:19:10 -0700
Dave, If you wind 2 chokes with one on #31 material (u=1000-1500) and one on ohms the choke wound on the #31 material may need X turns and the one on the #61 material ~3X turns.  The #31 material cho
/archives//html/RFI/2019-02/msg00015.html (16,800 bytes)

69. Re: [RFI] Bulk order source for Ferrite beads? (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Sun, 3 Feb 2019 15:54:56 -0700
I also designed some "Tempest" type communications stuff.  The EMI from it was required to be low enough that foreign spooks couldn't detect and decode what was happening. I have no interest in debat
/archives//html/RFI/2019-02/msg00017.html (14,096 bytes)

70. [RFI] Using #31 material for HF transmit baluns (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Mon, 11 Feb 2019 16:00:53 -0700
A couple of weeks ago there was a discussion about using #31 material for baluns at HF.  I decided to make some measurements to try and better understand what is going on.  If interested look at: htt
/archives//html/RFI/2019-02/msg00034.html (7,213 bytes)

71. Re: [RFI] Ferrite core and hot glue? (score: 1)
Author: Larry Benko <xxw0qe@comcast.net>
Date: Fri, 23 Aug 2019 07:52:27 -0600
Martin, About the only way to damage a ferrite core is to heat it above the curie point or to crack it by dropping it or contacting it with a hard object.  61 material ferrite has a Curie temperature
/archives//html/RFI/2019-08/msg00043.html (7,826 bytes)

Current List: 61 - 71
Page: [1] [2] [3] [4]
This search system is powered by Namazu