- 1. [Amps] wires through center of coax (score: 1)
- Author: John Lyles <jtml@losalamos.com>
- Date: Mon, 20 Dec 2010 00:12:23 -0700
- Bill - WA4LAV I hope that running wires through coax center conductor like this won't cause problems because I am doing it with the 9 3/16 inch diameter output feeder of a new amplifier I have been w
- /archives//html/Amps/2010-12/msg00279.html (8,096 bytes)
- 2. [Amps] wires through center of coax (score: 1)
- Author: "Jim Thomson" <jim.thom@telus.net>
- Date: Mon, 20 Dec 2010 08:04:12 -0800
- Bill - WA4LAV I hope that running wires through coax center conductor like this won't cause problems because I am doing it with the 9 3/16 inch diameter output feeder of a new amplifier I have been w
- /archives//html/Amps/2010-12/msg00285.html (9,137 bytes)
- 3. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Mon, 20 Dec 2010 16:53:55 -0500
- Under the right conditions it can be done. ________________________________________ From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of Jim Thomson [jim.thom@telus.net] Sent:
- /archives//html/Amps/2010-12/msg00287.html (9,875 bytes)
- 4. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Mon, 20 Dec 2010 17:07:48 -0500
- If the potentials on the wire as it enters and exits the hollow center conductor maintained the same as that on the center conductor and it may also be necessary to have the same velocity factor for
- /archives//html/Amps/2010-12/msg00288.html (11,461 bytes)
- 5. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Mon, 20 Dec 2010 17:21:11 -0500
- It just occurred: The characteristic impedance of a transmission line is equal the square root of the unit length inductance divided by the unit length capacitance. By adding a conductor on the insid
- /archives//html/Amps/2010-12/msg00289.html (11,981 bytes)
- 6. Re: [Amps] wires through center of coax (score: 1)
- Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
- Date: Mon, 20 Dec 2010 19:11:46 -0500
- If you put a conductor grounded on each end inside the hollow center conductor, and the hollow center conductor wall is many skin depths thick (which it always will be for hollow-core coax, so it do
- /archives//html/Amps/2010-12/msg00290.html (8,885 bytes)
- 7. Re: [Amps] wires through center of coax (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 20 Dec 2010 19:53:33 -0500
- A hollow tube (the inside of the center conductor) will act as a waveguide beyond cutoff and will not propagate energy. But the minute you place a wire inside that tube it then acts like a transmissi
- /archives//html/Amps/2010-12/msg00291.html (15,143 bytes)
- 8. Re: [Amps] wires through center of coax (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 20 Dec 2010 20:12:03 -0500
- Use stubs shorted stubs for entry. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
- /archives//html/Amps/2010-12/msg00292.html (14,049 bytes)
- 9. Re: [Amps] wires through center of coax (score: 1)
- Author: "Roger (K8RI)" <sub1@rogerhalstead.com>
- Date: Mon, 20 Dec 2010 20:13:49 -0500
- The unit length capacitance is *between* the inner and outer conductors. Lines fed in through stubs will have no effect on this unit length capacitance . 73 Roger (K8RI) _____________________________
- /archives//html/Amps/2010-12/msg00293.html (13,951 bytes)
- 10. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Mon, 20 Dec 2010 23:16:00 -0500
- Question, how do you place a wire in an hollow conductor with out creating a path for RF current on the outside to the inside? 73 Bill wa4lav The unit length capacitance is *between* the inner and ou
- /archives//html/Amps/2010-12/msg00295.html (15,326 bytes)
- 11. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Mon, 20 Dec 2010 23:25:40 -0500
- Can you make a path for the wire into the hollow center conductor with out creating a surface path connecting the outside of the hollow center conductor to the inside? 73 Bill wa4lav A hollow tube (t
- /archives//html/Amps/2010-12/msg00296.html (16,072 bytes)
- 12. Re: [Amps] wires through center of coax (score: 1)
- Author: Ron Youvan <ka4inm@tampabay.rr.com>
- Date: Tue, 21 Dec 2010 05:47:47 +0000
- < Answer, you put a shorted stub on each end of the part of the transmission line where you don't want the line exposed to the elements (frequently the short in an elbow using 6" or larger line, thin
- /archives//html/Amps/2010-12/msg00297.html (9,929 bytes)
- 13. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Tue, 21 Dec 2010 02:17:11 -0500
- I believe in your case the RF potential between the wire and the inside of the inner conductor are the same at the entrance. This is fine. Earlier I said that would be a condition that would work. We
- /archives//html/Amps/2010-12/msg00298.html (13,256 bytes)
- 14. [Amps] wires through center of coax (score: 1)
- Author: John Lyles <jtml@losalamos.com>
- Date: Wed, 22 Dec 2010 01:17:37 -0700
- Use of a quarter wave stub is common in fixed-frequency high power work to introduce mechanical linkages or electrical circuits that need to be inside the center conductor of a coaxial transmission l
- /archives//html/Amps/2010-12/msg00305.html (10,684 bytes)
- 15. Re: [Amps] wires through center of coax (score: 1)
- Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
- Date: Wed, 22 Dec 2010 12:22:53 -0500
- For the same reasons but in revers it works for 1/4 wave resonators in amplifiers and such but it is turned around. It works as a choke to balance currents on antennas. This is a case where there is
- /archives//html/Amps/2010-12/msg00306.html (12,738 bytes)
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