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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+coax\s+shield\s+outside\s+impedance\?\s*$/: 7 ]

Total 7 documents matching your query.

1. [RFI] coax shield outside impedance? (score: 1): Author: Ray LaRue <w4byg@att.net>; Date: Wed, 25 Nov 2020 18:47:12 +0000; I have a question that I've not seen discussed before. Maybe it has been, but I don't remember seeing it. *When attempting to minimze CMI on the outside of 50 ohm coax, the shield is not normally 50; /archives//html/RFI/2020-11/msg00061.html (6,797 bytes)
2. Re: [RFI] coax shield outside impedance? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 25 Nov 2020 11:38:41 -0800; In the common mode circuit, the coax shield is acting as part of the antenna, so like any antenna, current and voltage, thus the impedance, vary along its length. Impedance is highest at ends, lowest; /archives//html/RFI/2020-11/msg00062.html (7,753 bytes)
3. Re: [RFI] coax shield outside impedance? (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Wed, 25 Nov 2020 12:52:33 -0800; Jim, I have an additional question along this line... If the coax is buried, I have heard, there is no need for a choke. Is this true? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer; /archives//html/RFI/2020-11/msg00063.html (8,524 bytes)
4. Re: [RFI] coax shield outside impedance? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 25 Nov 2020 14:07:34 -0800; If the coax is buried, I have heard, there is no need for a choke. Is this true? The answer to this is not simple. First, the skin depth of soil can be a significant fraction of a wavelength, depend; /archives//html/RFI/2020-11/msg00064.html (9,453 bytes)
5. Re: [RFI] coax shield outside impedance? (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Wed, 25 Nov 2020 14:32:06 -0800; Thanks Jim, I'm off to build a choke... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources I; /archives//html/RFI/2020-11/msg00065.html (9,936 bytes)
6. Re: [RFI] coax shield outside impedance? (score: 1): Author: donovanf@erols.com; Date: Wed, 25 Nov 2020 17:45:46 -0500 (EST); Hi Dave, Burial prevents common mode radiation onto the the buried portion of the feed line. This is an excellent common mode suppression technique for very low signal level receiving antennas such a; /archives//html/RFI/2020-11/msg00066.html (9,935 bytes)
7. Re: [RFI] coax shield outside impedance? (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Wed, 25 Nov 2020 16:48:09 -0800; Hi Frank, Thank you Frank!! 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources Burial preven; /archives//html/RFI/2020-11/msg00067.html (10,751 bytes)

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