Search String: Display: Description: Sort:

Results:

References: [ +from:btippett@alum.MIT.edu: 21 ]

Total 21 documents matching your query.

1. [Antennaware] Velocity factor of insulated #14 stranded wire (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 20 Jun 2004 19:00:30 -0400
I know the new version of Eznec 4.0 handles this but does anyone know the correction factor for insulated it is about 95% but does anyone know for sure? 73, Bill W4ZV ________________________________
/archives//html/Antennaware/2004-06/msg00005.html (7,445 bytes)

2. [TowerTalk] Follow Up - Velocity factor of insulated #14 strandedwire (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Mon, 21 Jun 2004 22:13:07 -0400
Thanks for many responses! They were in unanimous agreement that the resonant frequency is raised by about 3% for insulated versus bare wire. 73, Bill W4ZV ___________________________________________
/archives//html/Antennaware/2004-06/msg00008.html (7,613 bytes)

3. [Antennaware] Model for Trapped tribander with log cellfeed (score: 1)
Author: btippett@alum.mit.edu (Bill Tippett)
Date: Wed, 05 Jun 2002 21:47:04 +0100
log cell feed. Has anyone done this? It is a formidable project for a an inexperienced modeler. This TH-6DXX model by K9UWA is the closest thing I've seen to what you want: http://www.kkn.net/~k5tr/t
/archives//html/Antennaware/2002-06/msg00006.html (7,051 bytes)

4. [Antennaware] Cylindrical Model for Triangular Tower (score: 1)
Author: btippett@alum.mit.edu (Bill Tippett)
Date: Tue, 21 May 2002 14:09:54 +0100
Somewhere I got the following formula for a cylindrical equivalent to triangular tower like Rohn 45. Equivalent Cylindrical Diameter = 2 * CUBEROOT [(D * F^2)/2] where D = tube diameter and F = Face
/archives//html/Antennaware/2002-05/msg00001.html (7,055 bytes)

5. [antennaware] EZNEC modeling (score: 1)
Author: btippett@alum.mit.edu (Bill Tippett)
Date: Thu, 02 Mar 2000 12:32:13 +0000
I successfully modeled my stack of monobanders on 10. Now I would like to look at the pattern when rotating each separately. Does anyone know an easy way to do this in EZNEC? If I try the Macro rotat
/archives//html/Antennaware/2000-03/msg00000.html (6,858 bytes)

6. [antennaware] EZNEC modeling (score: 1)
Author: btippett@alum.mit.edu (Bill Tippett)
Date: Sat, 04 Mar 2000 10:13:06 +0000
Rotating antennas is possible with K6STI's AO but not with EZNEC. Thanks to K9UWA for doing a few plots for me with AO. Attached is a response from W7EL. 73, Bill W4ZV I'm sorry, but there's no easy
/archives//html/Antennaware/2000-03/msg00004.html (7,509 bytes)

7. [antennaware] KLM Monobander Models (score: 1)
Author: btippett@alum.MIT.edu (Bill Tippett)
Date: Mon, 09 Aug 1999 15:19:42 +0100
Has anyone modeled KLM monoband antennas (not linear loaded ones)? If so I would appreciate a copy of your models for EZNEC...also any optimization of their recommended dimensions. Please reply direc
/archives//html/Antennaware/1999-08/msg00024.html (6,790 bytes)

8. [Antennaware] MMANA (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 06 Nov 2004 15:39:11 -0500
copy of EZNEC (or ....) and start modeling. A Russian friend recommended MMANA as being much easier than Eznec but using the same NEC-2 engine. Since it is free, it would certainly be worth a try for
/archives//html/Antennaware/2004-11/msg00010.html (7,169 bytes)

9. [TowerTalk] MMANA (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 06 Nov 2004 15:43:11 -0500
I forgot to add the NEC-2 link: http://www.qsl.net/ua3avr/ 73, Bill W4ZV _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
/archives//html/Antennaware/2004-11/msg00011.html (6,594 bytes)

10. [Antennaware] Realistic Wire Loss? (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Thu, 24 Mar 2005 08:32:46 -0500
I've been modeling my array for 160 and was surprised to see a difference in maximum gain of 0.39 dB for "Zero Loss" in Eznec 3.0 versus "Zinc" for my tower. Does this sound reasonable? I would not h
/archives//html/Antennaware/2005-03/msg00011.html (6,763 bytes)

11. [Antennaware] YO7 & OWA Design (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 26 Mar 2006 07:09:09 -0500
K5GO: would show, I put in the element lengths, spacing and diameters for the WA3FET design OWA yagis and was surprised to find that YO7 showed something entirely different than what WA3FET shows as
/archives//html/Antennaware/2006-03/msg00010.html (6,892 bytes)

12. [Antennaware] Multi bobtail (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sat, 06 May 2006 22:42:55 -0400
are any snakes in the grass that I am missing? Sam, you might contact Randy W0MJ or Bill N4AR. Randy had a phased bobtail on 80m in the early 80's and I believe Bill also had one a little later. Neit
/archives//html/Antennaware/2006-05/msg00004.html (6,682 bytes)

13. [Propagation] Cubical Quad antenna model for VOACAP??? (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Fri, 12 May 2006 09:31:59 -0400
This e-mail posting is from the Radio Propagation Reflector that you're currently subscribed to. Refer to the end of this e-mail for directions on how to change your subscription options, or to unsub
/archives//html/Antennaware/2006-05/msg00008.html (7,386 bytes)

14. Re: [Antennaware] [Propagation] Cubical Quad antenna model forVOACAP??? (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 14 May 2006 06:44:34 -0400
Tony, I think we are saying the same thing. A 3 el Yagi (on a 1.8 X 8' = 14.4' boom) should be very close to a 2 el Quad on an 8' boom. Regarding anecdotal comparisons, I would simply note that none
/archives//html/Antennaware/2006-05/msg00011.html (8,620 bytes)

15. Re: [Antennaware] Cubical Quad antenna model for VOACAP (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Sun, 14 May 2006 16:26:37 -0400
(0.205 and 0.142 lambda respectively) and got free space gains of 7.4-7.5 dBi. My design criteria were maximum gain and a reasonable match to 100 ohms. How much gain are you observing for two and thr
/archives//html/Antennaware/2006-05/msg00015.html (7,633 bytes)

16. [Antennaware] Equivalent Diameter of Triangular Tower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Fri, 20 Feb 2009 17:05:53 -0500
K9AY: diameter "solid wire" for the 25G tower (I used 5 inches). That sounds too small. Here's the formula I used to model my 160 vertical made of Rohn 45: http://lists.contesting.com/archives//html/
/archives//html/Antennaware/2009-02/msg00048.html (7,652 bytes)

17. Re: [Antennaware] Equivalent Diameter of Triangular Tower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Thu, 26 Feb 2009 09:04:44 -0500
Hi Gary, K9AY: radius of Rohn 25 tower: Proceedings, 14th Annual Review of Progress in Applied Computational Electromagnetics ("ACES" Conference), Monterey, CA 1998. I've found a reference for the fo
/archives//html/Antennaware/2009-02/msg00054.html (9,456 bytes)

18. [Antennaware] Equivalent Diameter of Triangular Tower (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Thu, 26 Feb 2009 09:18:29 -0500
said it originally came from IEEE Transactions on Broadcasting, but I don't have the exact chapter and verse. You might ask W1FV. After a little more searching: If you have access to the June 1998 is
/archives//html/Antennaware/2009-02/msg00055.html (8,239 bytes)

19. Re: [Antennaware] studying legacy KLM 20m big stick with eznec5 (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Tue, 17 Mar 2009 16:32:06 -0400
W5XZ: get a pretty nice swr / freq bandwidth with it fed DIRECTLY with 50 ohms. was thinking of applying the 'owa' approach with an additional director, closely spaced to the driven element, but it d
/archives//html/Antennaware/2009-03/msg00017.html (8,629 bytes)

20. [Antennaware] studying legacy KLM 20m big stick with eznec5 (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Tue, 17 Mar 2009 22:03:59 -0400
From the YO file for the KLM620: "See NICE5.YAG and NICE6.YAG for single-driven designs with superior performance on the same boomlength." (These are two other models in YO). I attempted to copy the
/archives//html/Antennaware/2009-03/msg00020.html (7,244 bytes)


This search system is powered by Namazu