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Total 14 documents matching your query.

1. [RFI] Please comment this picture (score: 1): Author: Martin Kratoska <martin@ok1rr.com>; Date: Tue, 3 Jan 2023 20:03:45 +0100; The attached picture displays my proposed CM choking scheme around the antenna switch. Take a look at this and comment, please - what is insufficient, what is an overkill etc. The pic is also here: h; /archives//html/RFI/2023-01/msg00010.html (7,797 bytes)
2. Re: [RFI] Please comment this picture (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 3 Jan 2023 11:23:24 -0800; The pic is also here: https://ok1rr.com/public/choking.png Where is the switch located? The most critical location for a common mode choke is at the antenna feedpoint. Chokes elsewhere in the system; /archives//html/RFI/2023-01/msg00011.html (8,619 bytes)
3. Re: [RFI] Please comment this picture (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 3 Jan 2023 19:59:09 +0000; Jim, I have measured (Icom 7300) reduction of nearly 11 dB of noise pickup from local sources by installing a bifilar wound common mode choke in the shack to transition from common mode from the tran; /archives//html/RFI/2023-01/msg00013.html (9,159 bytes)
4. Re: [RFI] Please comment this picture (score: 1): Author: "Dave (NK7Z)" <dave@nk7z.net>; Date: Tue, 3 Jan 2023 13:04:46 -0800; Hi Martin, I would not use snap-ons, or slip-ons. I would use FT-240-31 cores from Fair-Rite. The cores with wraps on them work far better than the snap on chokes. Look here: http://audiosystemsgroup; /archives//html/RFI/2023-01/msg00014.html (9,301 bytes)
5. Re: [RFI] Please comment this picture (score: 1): Author: Wes Stewart via RFI <rfi@contesting.com>; Date: Tue, 3 Jan 2023 22:08:04 +0000 (UTC); Martin, you do say close to the antenna so that is good. You don't say what kind of antenna, so that make a difference. I'm not one of those guys who is adverse to using sleeve cores, if there are e; /archives//html/RFI/2023-01/msg00015.html (9,815 bytes)
6. Re: [RFI] Please comment this picture (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Tue, 3 Jan 2023 17:21:13 -0500 (EST); Hi Wes, The justification for 5K or greater common mode choke resistance is to limit ferrite core heating for transmitting applications. Although it can be done, IMHO there's no imperative for 5K cho; /archives//html/RFI/2023-01/msg00016.html (10,521 bytes)
7. Re: [RFI] Please comment this picture (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 3 Jan 2023 14:38:37 -0800; On 1/3/2023 11:59 AM, David Eckhardt wrote: Jim, I have measured (Icom 7300) reduction of nearly 11 dB of noise pickup from local sources by installing a bifilar wound common mode choke in the shack; /archives//html/RFI/2023-01/msg00017.html (9,445 bytes)
8. Re: [RFI] Please comment this picture (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 3 Jan 2023 14:44:36 -0800; The lower value is in the context of pattern distortion. The higher value is in the context of the suppression of common mode noise. Higher values yet can provide greater power handling. 73, Jim K9YC; /archives//html/RFI/2023-01/msg00018.html (8,853 bytes)
9. Re: [RFI] Please comment this picture (score: 1): Author: <john@kk9a.com>; Date: Tue, 3 Jan 2023 22:49:32 -0500; What is your feedline? John KK9A Jim, I have measured (Icom 7300) reduction of nearly 11 dB of noise pickup from local sources by installing a bifilar wound common mode choke in the shack to transiti; /archives//html/RFI/2023-01/msg00020.html (6,455 bytes)
10. Re: [RFI] Please comment this picture (score: 1): Author: Martin Kratoska <martin@ok1rr.com>; Date: Wed, 4 Jan 2023 05:29:34 +0100; Forget to mention - the feedline is RG400. 73, Martin, OK1RR Dne 04. 01. 23 v 4:49 john@kk9a.com napsal(a): What is your feedline? John KK9A Jim, I have measured (Icom 7300) reduction of nearly 11 dB; /archives//html/RFI/2023-01/msg00022.html (7,621 bytes)
11. Re: [RFI] Please comment this picture (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 3 Jan 2023 21:19:17 -0800; That's very good coax for very special purposes like common mode chokes and patch cables in the shack. But it's but also very lossy -- equivalent of RG58 -- so I using much larger stuffto the antenna; /archives//html/RFI/2023-01/msg00024.html (7,453 bytes)
12. Re: [RFI] Please comment this picture (score: 1): Author: Martin Kratoska <martin@ok1rr.com>; Date: Wed, 4 Jan 2023 09:40:46 +0100; My feedline actually consists of more parts: 1) from radio to wall mounted switch - 8 mtrs of RG400 2) from the switch to 80m sloped dipole - 10 mtrs of RG400, a W2DU style choke balun is an integral; /archives//html/RFI/2023-01/msg00025.html (8,672 bytes)
13. Re: [RFI] Please comment this picture (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 4 Jan 2023 01:56:56 -0800; Martin, The W2DU balun is FAR more than style -- the design DEPENDS on a particular Fair-Rite part with an impedance characteristic that exactly fits most of the HF spectrum. I've described his desig; /archives//html/RFI/2023-01/msg00026.html (8,327 bytes)
14. Re: [RFI] Please comment this picture (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 4 Jan 2023 17:01:16 +0000; I mentioned in the original email the feedline is balanced. That would eliminate coaxial feedlines which are unbalanced. What's left is parallel conductor feedline like windowline, TV twin line, or 6; /archives//html/RFI/2023-01/msg00027.html (8,058 bytes)

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