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Total 279 documents matching your query.

1. [RFI] Tankless Water Heater RFI? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Tue, 10 Jul 2007 22:28:53 -0400
Is there any information re. the electrical/radio noise generated by the "... computer chips, sensors and high-power heating elements" in these devices, please? http://monolithic.com/plan-design/hotw
/archives//html/RFI/2007-07/msg00015.html (6,588 bytes)

2. Re: [RFI] Radio "Grounding" (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 09 Aug 2007 17:54:00 +0000
Twisted two-conductor #10 DC cable? I have not seen twisted power cable before - is this something you do to an existing cable or do you buy it that way? If pre-made can you suggest a commercial sour
/archives//html/RFI/2007-08/msg00022.html (7,504 bytes)

3. Re: [RFI] Radio "Grounding" (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 09 Aug 2007 21:54:44 +0000
I should have typed "shield grounded at one end". Too much plastic and too broad an input in a FT-857D (not to mention the vulnerabilities of the boatanchor AM rig I am considering running in the va
/archives//html/RFI/2007-08/msg00027.html (9,877 bytes)

4. Re: [RFI] [FT-857] RF noise throughout the HF band most noticeableon SSB (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Sun, 19 Aug 2007 22:52:32 -0500
This may be best addressed on one of the two RFI-related lists to which I took the liberty of cross-posting. If RFI discussions are on the RFI list they have a better chance of expert assistance and
/archives//html/RFI/2007-08/msg00045.html (7,842 bytes)

5. Re: [RFI] VDSL (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Wed, 29 Aug 2007 19:18:35 -0500
There is a detailed explanation here: www.howstuffworks.com/vdsl.htm A sample section of the text: "VDSL provides an incredible amount of bandwidth, with speeds up to about 52 megabits per second (Mb
/archives//html/RFI/2007-08/msg00052.html (7,153 bytes)

6. [RFI] Are nuvistors sturdier than transistors? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 30 Aug 2007 13:50:24 -0500
Am I correct to believe that a nuvistor would be more resilient versus transients from surges such as static, nearby/indirect lightning strikes, and other emp sources? Do nuvistors 'age' like tubes o
/archives//html/RFI/2007-08/msg00055.html (6,648 bytes)

7. Re: [RFI] Are nuvistors sturdier than transistors? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 30 Aug 2007 14:24:59 -0500
I stand corrected! :-) Rephrased: I was taught that germanium transistors 'aged', and that old tubes could develop base leaks - both happening even when on the shelf - plus traditional glass tubes su
/archives//html/RFI/2007-08/msg00057.html (8,266 bytes)

8. Re: [RFI] VDSL (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 30 Aug 2007 20:46:43 -0500
I use http://clusty.com myself. Was unhappy with Google's business/political model. -- Thanks! & 73, doc, KD4E Personal: http://bibleseven.com/kd4e.html ______________________________________________
/archives//html/RFI/2007-08/msg00061.html (7,489 bytes)

9. [RFI] Meter Sensitivity to Surges (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Wed, 26 Sep 2007 15:51:27 -0500
We have discussed tube, nuvistor, transistor, and IC vulnerability to EMP (common, e.g. static charges, and exotic, e.g. terrorist attack). My question goes to the information displays and measuring
/archives//html/RFI/2007-09/msg00019.html (6,846 bytes)

10. Re: [RFI] Meter Sensitivity to Surges (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Thu, 27 Sep 2007 21:04:28 -0500
Thank you for your thoughtful and informed reply! It was filled with educational value - as a sometimes adjunct prof I really value that. Weapon-generated EMP is not big on my list of concerns, thoug
/archives//html/RFI/2007-09/msg00027.html (9,501 bytes)

11. [RFI] Noisy Rear AC Fan Switch? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Fri, 12 Oct 2007 12:50:17 -0500
When I turn up the fan setting for the rear AC unit in our van the RFI on AM-BC is brutal! There is already a lot of other RFI in the car that I am trying to chase but this is real obvious. Is it lik
/archives//html/RFI/2007-10/msg00034.html (6,653 bytes)

12. [RFI] CFL bulbs - Inpact of Aging (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Fri, 19 Oct 2007 11:54:53 -0500
Has anyone seen a study of CFL's over time? I read somewhere that the aging process, mostly heat, power surges, and brownouts, wreaks havoc and that over time CFL's can become incrementally more nois
/archives//html/RFI/2007-10/msg00087.html (9,066 bytes)

13. Re: [RFI] CFL/warming (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Fri, 19 Oct 2007 15:17:52 -0500
This is an interesting piece of text: "End of life logic guards against violent failures" No mention of "dimmability". Description: TCP 1R4023PERM Floodlight Compact Fluorescent Light Bulb - 23W R40
/archives//html/RFI/2007-10/msg00093.html (7,645 bytes)

14. [RFI] Cellphone-Jammer Fad - Harmful to Ham Radio? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Sun, 04 Nov 2007 23:52:03 -0500
I am not sure how broadband these are but imagine they could create RFI in a nearby Ham rig. WDYT? One product: http://www.phonejammer.com/cell-phone-jammer/p2jbz.asp Lengthy article: http://www.nyti
/archives//html/RFI/2007-11/msg00000.html (6,687 bytes)

15. Re: [RFI] Cellphone-Jammer Fad - Harmful to Ham Radio? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Mon, 05 Nov 2007 10:29:38 -0500
It would be interesting to check out the circuit. One wonders if they are using a source ocscillator in a Ham band and are multiplying it up. Since they are jamming multiple bands they otherwise coul
/archives//html/RFI/2007-11/msg00002.html (7,639 bytes)

16. Re: [RFI] Help with Powerline Interference (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Mon, 05 Nov 2007 16:39:17 -0500
Is it possible that there is a resonant section they could break up or bypass along the vertical run to the bluff? Just a wild guess ... :-) -- Thanks! & 73, doc, KD4E Personal: http://bibleseven.com
/archives//html/RFI/2007-11/msg00005.html (8,353 bytes)

17. Re: [RFI] RFI Resistant (and high quality) Computer Speakers??? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Wed, 07 Nov 2007 17:13:15 -0500
Have you communicated with Bob Heil, K9EID or Chip Margelli, K7JA? http://www.heilsound.com/ -- Thanks! & 73, doc, KD4E Personal: http://bibleseven.com/kd4e.html _____________________________________
/archives//html/RFI/2007-11/msg00018.html (7,827 bytes)

18. Re: [RFI] Car laptop adaptors (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Sat, 10 Nov 2007 12:31:37 -0500
Mel Crichton wrote:Which natively 12VDC laptop did you buy, please? Will the battery charge from 12VDC or do you have to do that via the ac adapter and an inverter or at home? How's the RFI from the
/archives//html/RFI/2007-11/msg00026.html (7,773 bytes)

19. Re: [RFI] Car laptop adaptors (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Sat, 10 Nov 2007 20:45:44 -0500
That's why most of us fuse our DC cables - perhaps an intermediate battery or large cap might add to mobile gear longevity? I believe that the internal battery in a laptop, together with a fused cabl
/archives//html/RFI/2007-11/msg00032.html (7,807 bytes)

20. Re: [RFI] Non-transmitting tower causes RFI/EMI? (score: 1)
Author: kd4e <doc@kd4e.com>
Date: Wed, 14 Nov 2007 08:34:10 -0500
Given the politicization of the government "public" school classrooms it would not help - they would merely ram more Al Gore anti-science propaganda down their throats and call it science. School pri
/archives//html/RFI/2007-11/msg00052.html (8,980 bytes)

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