Towertalk archive search

1. Re: [TowerTalk] Winch Recommendation for Tramming Antennas Up/Down (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Wed, 7 Nov 2007 07:58:24 -0800 (PST)

Try these guys. http://www.portablewinch.com/ http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ To

/archives//html/Towertalk/2007-11/msg00171.html (8,449 bytes)

2. [TowerTalk] CADWELD Question (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Wed, 28 Nov 2007 09:48:18 -0800 (PST)

Should one weatherproof (i.e., tape) cadweld connections (Cu to Cu) that will be buried? I personally think it's a waste of time and material, but if someone can explain why it's necessary (that is,

/archives//html/Towertalk/2007-11/msg00521.html (6,910 bytes)

3. [TowerTalk] Closure Of Cadweld Question (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Wed, 28 Nov 2007 17:48:02 -0800 (PST)

Thanks to all who replied to my question regarding protection of Cadweld joints. All respondents confirmed my guess that it's not required. Thanks again for the help. 73, Jeff _______________________

/archives//html/Towertalk/2007-11/msg00528.html (6,492 bytes)

4. [TowerTalk] Heliax Splices (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Mon, 31 Mar 2008 13:18:42 -0700 (PDT)

Will an Andrews L45Z for 7/8" heliax work with Eupen 7/8" heliax? My gut feeling is no since the Eupen heliax outer conductor OD is slightly smaller than that of the Andrews equivalent. However, of a

/archives//html/Towertalk/2008-03/msg00646.html (6,854 bytes)

5. [TowerTalk] Problem With OR2800DC - HELP (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Fri, 23 May 2008 23:38:08 -0700 (PDT)

While shutting down my station tonight after working the WPX contest, I accidentally flicked the power switch to the OR2800DC control box off and then back on quickly. When I did this, the display sh

/archives//html/Towertalk/2008-05/msg00432.html (6,915 bytes)

6. Re: [TowerTalk] TIC RING (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Wed, 15 Oct 2008 08:45:04 -0700 (PDT)

Aloha Bill. � I have several older 1022D model rings.� I was able to install these on my 145 foot Rohn 45 tower by myself over the period of two weekends.� I am sure if you had help it would go a lot

/archives//html/Towertalk/2008-10/msg00244.html (9,931 bytes)

7. [TowerTalk] Test (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Wed, 22 Oct 2008 06:23:30 -0700 (PDT)

Sorry for taking up the bandwidth...just testing. Jeffrey K. Okamitsu, PhD, MBA +1-609-638-5402 _______________________________________________ _______________________________________________ TowerTa

/archives//html/Towertalk/2008-10/msg00445.html (6,495 bytes)

8. [TowerTalk] Slipp Nott Clamps (score: 1)

Author: w3kl@w3kl.com

Date: Thu, 6 Nov 2008 13:28:32 -0800 (PST)

Are Slipp-Nott mast clamps (rotator to mast and boom to mast) really effective? � If so, where can I purchase them? � 73, Jeff Jeffrey K. Okamitsu, PhD, MBA +1-609-638-5402 __________________________

/archives//html/Towertalk/2008-11/msg00149.html (7,067 bytes)

9. [TowerTalk] Help Needed - Rohn 45G (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 14 Nov 2008 08:53:21 -0800 (PST)

Does anyone happen to know the OD of the legs of 45G tower? � I need the info quickly and my Rohn book is at home. � Tks es 73, Jeff W3KL Jeffrey K. Okamitsu, PhD, MBA +1-609-638-5402 _______________

/archives//html/Towertalk/2008-11/msg00359.html (6,455 bytes)

10. [TowerTalk] Test (score: 1)

Author: w3kl@w3kl.com

Date: Wed, 19 Nov 2008 08:08:23 -0800 (PST)

Sorry for the excess bandwidth. � 73, Jeff Jeffrey K. Okamitsu, PhD, MBA +1-609-638-5402 _______________________________________________ _______________________________________________ TowerTalk mail

/archives//html/Towertalk/2008-11/msg00480.html (6,662 bytes)

11. Re: [TowerTalk] Ground Plane Model Problem (score: 1)

Author: w3kl@w3kl.com

Date: Wed, 19 Nov 2008 08:15:32 -0800 (PST)

Tom.� I've modeled a 1/4 wave gp with one resonant radial (1/4 wavelength) using the dimension you provided using NEC4 and it yields an impedance (real part, at resonance) of 40 ohms. BTW, you didn't

/archives//html/Towertalk/2008-11/msg00481.html (9,057 bytes)

12. Re: [TowerTalk] Inverted L Tuning - Solved - LONG (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 5 Dec 2008 08:48:23 -0800 (PST)

I disagree with a couple of conclusions here. � First, if the tower is indeed close to being resonant on 160, then adding radials (i.e., lowering the ground resistance) isn't going to change the reso

/archives//html/Towertalk/2008-12/msg00085.html (14,749 bytes)

13. Re: [TowerTalk] Inverted L Tuning - Solved - LONG (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 5 Dec 2008 12:54:56 -0800 (PST)

Sorry, I didn't make myself clear.� Yes, absolutely the inv L needs to see an efficient ground. � However, my point was it doesn't matter if the radials start at the tower or at the base of the Inv L

/archives//html/Towertalk/2008-12/msg00096.html (10,515 bytes)

14. Re: [TowerTalk] Inverted L Tuning - Solved - LONG (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 5 Dec 2008 13:00:32 -0800 (PST)

Another point of clarification... � The assertion made regarding no difference between radials starting at the tower and radials starting at the base of the Inv L can be made due to the relatviely sh

/archives//html/Towertalk/2008-12/msg00097.html (11,776 bytes)

15. Re: [TowerTalk] Topband: Inverted L Tuning Question (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 5 Dec 2008 13:47:05 -0800 (PST)

Interaction with the tower has nothing to do with tieing into the tower ground but coupling between the actual inv L and the tower itself.� See my previous post on how to deal with this. � 73, Jeff W

/archives//html/Towertalk/2008-12/msg00105.html (12,123 bytes)

16. Re: [TowerTalk] 160 radials (score: 1)

Author: w3kl@w3kl.com

Date: Fri, 5 Dec 2008 14:29:10 -0800 (PST)

For multiple radials laid on the ground or buried just below the ground, there is no "resonance" effect - that is, there is no such thing as a tuned radial for wires laid on the ground or buried just

/archives//html/Towertalk/2008-12/msg00109.html (10,728 bytes)

17. Re: [TowerTalk] 160 radials (score: 1)

Author: w3kl@w3kl.com

Date: Sat, 6 Dec 2008 05:38:17 -0800 (PST)

I'm not disagreeing with the fact that for a small number of wires�close to or on�the ground that they will not have a resonant less than a physical 1/4 wavelength.� What I am saying is that for a la

/archives//html/Towertalk/2008-12/msg00133.html (13,723 bytes)

18. Re: [TowerTalk] Tower Detuning (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Mon, 4 Oct 2010 17:22:07 -0700 (PDT)

How are you setting�up the�W8JI parallel resonant�circuit? I�detune my 140 foot tower using the W8JI method because it was coupling into my�160 m inv L.� Works great. I�hang a wire from aboout 80 fee

/archives//html/Towertalk/2010-10/msg00024.html (8,803 bytes)

19. Re: [TowerTalk] myth about engineers? (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Fri, 12 Nov 2010 10:17:54 -0800 (PST)

In my�career in pure research, R&D, and product design as well as leadership of R&D, engineering, and product development, I have�worked with�scientists and engineers that run the gamut from "it's ne

/archives//html/Towertalk/2010-11/msg00195.html (9,838 bytes)

20. [TowerTalk] WTB: OR2800DC (score: 1)

Author: Jeffrey Okamitsu <w3kl@w3kl.com>

Date: Mon, 4 Apr 2011 06:55:57 -0700 (PDT)

I'm looking for an OR2800DC�to use as a spare for my existing system.��I prefer to buy just the rotator�itself and not the controller.� If you have a unit that you're willing to part with, please ema

/archives//html/Towertalk/2011-04/msg00065.html (6,530 bytes)