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Total 14 documents matching your query.

1. [RFI] Maintaining 50 Ohms... (score: 1): Author: Dave <dave@nk7z.net>; Date: Fri, 17 Sep 2021 15:36:14 -0700; Hi, I am building a static bleed resistor, (5 Mohm), inserter, and want to place it on the transceiver output, not at the feedpoint of the antenna... I have not seen this done in this way before, whi; /archives//html/RFI/2021-09/msg00041.html (6,884 bytes)
2. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sat, 18 Sep 2021 00:54:56 +0000; I have lost too many preamps due to near-by lightning and static discharge. After the last (expensive) MMIC failure, I have made a practice of installing a resistor to return (chassis or "ground") ac; /archives//html/RFI/2021-09/msg00042.html (8,074 bytes)
3. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 17 Sep 2021 18:25:22 -0700; On 9/17/2021 5:54 PM, David Eckhardt wrote: The value is anything over 10 kohms. The disturbance to the 50-ohm impedance is completely negligible. The rule-of-thumb on the resistor value is something; /archives//html/RFI/2021-09/msg00043.html (7,305 bytes)
4. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Dave <dave@nk7z.net>; Date: Sat, 18 Sep 2021 04:35:08 -0700; Thanks gents... The resistors I am using are 10 M, 20KVs. I will build a small chassis and put them on inside, with a pair of SO-239s. 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer; /archives//html/RFI/2021-09/msg00044.html (8,080 bytes)
5. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: MICHAEL ST ANGELO <mstangelo@comcast.net>; Date: Sat, 18 Sep 2021 08:41:09 -0400 (EDT); I also use high voltage input coupling capacitors on my preamps. This is a trick I learned by the CATV industry. Mike N2MS _______________________________________________ RFI mailing list RFI@contest; /archives//html/RFI/2021-09/msg00045.html (9,377 bytes)
6. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Dave <dave@nk7z.net>; Date: Sat, 18 Sep 2021 05:50:50 -0700; Actually, I just thought of this, I will add them to my 1:1 ferrite choke!! That way, I don't have to build anything but a PC board. 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Ex; /archives//html/RFI/2021-09/msg00046.html (8,314 bytes)
7. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Sat, 18 Sep 2021 13:38:22 +0000 (UTC); Just curious, Dave - Have you ever looked with an O-scope to see what presents itself on an open wire or conductor in the vicinity of a T-storm? Most O-scopes are 1 MOhm input Z, and one can still se; /archives//html/RFI/2021-09/msg00047.html (10,112 bytes)
8. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Sat, 18 Sep 2021 08:39:01 -0700; For Tx antennas the power rating of the resistor is the limiting factor. For "nominal" QRO @ 50 ohms, about 300 volts RF so 68K ohms would dissipate 1.32 watts @ 100% duty cycle. Allen Bradley 2w car; /archives//html/RFI/2021-09/msg00048.html (9,489 bytes)
9. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 18 Sep 2021 11:22:52 -0700; I've deleted the original post in this thread. Did it start with a choke with the bleed included? Several thoughts. First, the first choke in any system should be at the antenna feedpoint, not in the; /archives//html/RFI/2021-09/msg00049.html (8,880 bytes)
10. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Dave <dave@nk7z.net>; Date: Sat, 18 Sep 2021 21:40:52 -0700; Hi Jim, This is a bleeder question, and my chokes are in boxes that are plastic... I use a pair of FT240/31s. At no more than 500 watts, into a monopole with a decent radial system... I will be addin; /archives//html/RFI/2021-09/msg00050.html (9,760 bytes)
11. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: KD7JYK DM09 <kd7jyk@earthlink.net>; Date: Sat, 18 Sep 2021 21:57:05 -0700; Does your radio not have an inductor, and capacitor at the connector? Since almost the beginning of radio, this has been the standard, no direct connection of the circuitry to the center pin of the c; /archives//html/RFI/2021-09/msg00051.html (8,295 bytes)
12. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Dave <dave@nk7z.net>; Date: Sun, 19 Sep 2021 05:43:03 -0700; It's a K3, I'll check, hopefully yes... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources K; /archives//html/RFI/2021-09/msg00052.html (9,099 bytes)
13. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Hugo Loranger <ve2_ugo@hotmail.com>; Date: Tue, 21 Sep 2021 02:09:43 +0000; Hi Jim, So, if on my SPG, my surge protector are screwed on the panel and that after I connect my chokes and that after they are connected to my remote antenna selector which is also fixed on the sam; /archives//html/RFI/2021-09/msg00070.html (9,721 bytes)
14. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 20 Sep 2021 19:56:17 -0700; Hi Hugo, I'm confused by your question, and I suspect it's because you're confused too. I strongly suggest that you buy N0AX's book and spend a lot of time studying it. And/or the pdf slide deck on m; /archives//html/RFI/2021-09/msg00071.html (9,068 bytes)

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