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Total 684 documents matching your query.

1. [TowerTalk] Twin-coax balanced line (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Aug 5 21:17:49 2003
Yes, Chuck, I ran similar calculations and found that I needed to go with at least 7/8" heliax in order to be competitive with open wire line when trying to feed antennas with very high input impedan
/archives//html/Towertalk/2003-08/msg00162.html (9,640 bytes)

2. [TowerTalk] Re: Coax Disconnection AND A BIGGER ISSUE (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Sat Aug 9 08:03:11 2003
Jim, et al: Make sure you are wearing hip wadder boots when you start reading the stuff submitted by the BPL lobbyists. A number of them clearly need to crack their physics textbooks for a refresher
/archives//html/Towertalk/2003-08/msg00262.html (12,471 bytes)

3. [TowerTalk] Re: (Tower Talk) Re: Coax Disconnection AND A BIGGERISSUE (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Sat Aug 9 16:18:54 2003
Jim, et al: Make sure you are wearing hip wadder boots when you start reading the stuff submitted by the BPL lobbyists. A number of them clearly need to crack their physics textbooks for a refresher
/archives//html/Towertalk/2003-08/msg00294.html (10,665 bytes)

4. Re: [TowerTalk] W0IYH Feed line Choke Performance (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 21 Aug 2003 09:06:27 -0700
This sort of goes along with both (a) and (e), but I worth reiterating. If you are running a horizontally polarized antenna, the choke will help to reduce the vertically polarized response added by
/archives//html/Towertalk/2003-08/msg00714.html (10,804 bytes)

5. [TowerTalk] Reminder - Deadline for Comments on Broadband Over Powerline NOI (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Thu Jul 3 08:44:50 2003
Fellow Reflectorites: Just a quick reminder that the deadline for filing comments in response to the FCC's Notice of Inquiry on Broadband over Powerline (BPL) is this coming MONDAY JULY 7, 2003. If y
/archives//html/Towertalk/2003-07/msg00039.html (8,919 bytes)

6. [TowerTalk] Reminder - Deadline for Comments on Broadband OverPowerline NOI (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Thu Jul 3 13:36:27 2003
Thanks for your very thought provoking comments, Jim. While I am not sure that I agree that large scale BPL rollout is a fate accompli, I do agree that it is important that reply comments address the
/archives//html/Towertalk/2003-07/msg00052.html (10,775 bytes)

7. [TowerTalk] Is my 5 el 10 detuning my 4 el 40? ? (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Mon Jul 7 16:13:08 2003
Scott, A couple of questions: 1) Where are you measuring the impedance - at the feedpoint or through a length of coax? 2) If through a length of coax, how long and what type? 3) Did you cross over th
/archives//html/Towertalk/2003-07/msg00105.html (12,470 bytes)

8. [TowerTalk] Re: Is my 5 el 10 detuning my 4 el 40? ? (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Mon Jul 7 17:20:52 2003
Did you get the periodic variation in impedance (800 KHz to 1 MHz periodicity) when you measured from the top of the tower, or just when you measured from base with the 130' coax? I would try discon
/archives//html/Towertalk/2003-07/msg00112.html (7,806 bytes)

9. [TowerTalk] lightning suppression on cable (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Thu Jul 10 11:55:14 2003
Pete, get a gas tube grounding block. http://www.viewsonics.com/webapp/wcs/stores/servlet/ENPlevel2catView?categor yId=11257&catalogId=10013&storeId=10013&catalogId=10013&langId=-1 Click on Grounding
/archives//html/Towertalk/2003-07/msg00155.html (8,681 bytes)

10. [TowerTalk] lightning suppression on cable (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Thu Jul 10 14:04:50 2003
This brings up an interesting question, Jim. The gas tube ground blocks I mentioned are basically the same thing with a gas tube used in addition or in place of the air-gap. Since the aggregate RF vo
/archives//html/Towertalk/2003-07/msg00158.html (8,739 bytes)

11. [TowerTalk] Balun filler (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Fri Jul 11 21:31:56 2003
The type 77 material is notorious for having a poor loss tangent, hence the 60 deg phase angle. Type 61 material is much better, but the mu is much lower so you need bocque beads to get the same seri
/archives//html/Towertalk/2003-07/msg00171.html (9,448 bytes)

12. [TowerTalk] Balun filler (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Fri Jul 11 21:44:24 2003
The two I purchased are up high in the air, otherwise I would do as you suggested - hi hi. Mike, W4EF................................................................... numbers. Weather Stations", an
/archives//html/Towertalk/2003-07/msg00174.html (10,016 bytes)

13. [TowerTalk] Balun filler (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jul 15 20:40:20 2003
That's interesting, Joe. I thought type 73 and type 77 were both lousy in terms of loss tangent. In fact, when I looked up the tan(d)/ui numbers in my amidon catalog - they appear to me to be very si
/archives//html/Towertalk/2003-07/msg00231.html (12,049 bytes)

14. [TowerTalk] Plumbing > Hardline (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Wed Jul 16 20:09:24 2003
I tried this a while back, but I had some little trouble with the compression fittings rotating around the hardline outer conductor. Anyway to cure this, or was it perhaps that the hardline I was usi
/archives//html/Towertalk/2003-07/msg00264.html (10,613 bytes)

15. [TowerTalk] Help, I thought I was out of the woods (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jul 29 00:43:51 2003
It sounds like an oxymoron, but what its referring to is cable TV that is delivered to subscribers using terrestrial microwave at 2.5 GHz. http://www.wcai.com/mmds.htm 73 de Mike, W4EF...............
/archives//html/Towertalk/2003-07/msg00470.html (9,002 bytes)

16. [TowerTalk] Balanced Line using Coax ? (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jul 29 11:21:56 2003
Actually, it depends on whether or not you connect the shields together at both ends. If you don't connect the shields together at both ends, then current can be capacitively coupled from the center
/archives//html/Towertalk/2003-07/msg00490.html (10,578 bytes)

17. [TowerTalk] Balanced Line using Coax ? (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jul 29 21:35:27 2003
Don't feel bad, Jim. I went to bed last night thinking that it was 1/2 the loss, but when my head hit the pillow I started to imagine two separate generators (one driving each coax with 1/2 the total
/archives//html/Towertalk/2003-07/msg00506.html (12,185 bytes)

18. [TowerTalk] Line Isolators (was: common mode chokes) (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jul 1 00:24:59 2003
Hi Chuck, There should really be two power ratings for these isolator things. The first one should be the power handling for the normal differential transmission line mode. This test could be done w
/archives//html/Towertalk/2003-07/msg00526.html (8,315 bytes)

19. [TowerTalk] EdgeHog (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Mon Jun 2 18:51:22 2003
Has anyone tried one of these in rocky soil? I thought about getting one to do my yard, but I have so many rocks in my soil, I figured it wouldn't last very long (one cubic foot of soil area in my ya
/archives//html/Towertalk/2003-06/msg00061.html (8,773 bytes)

20. [TowerTalk] EdgeHog (score: 1)
Author: W4EF@dellroy.com (Michael Tope)
Date: Tue Jun 3 00:33:13 2003
Yes, Jim, we used one of those "ditch witches" here at my QTH last year to lay drain pipe and my gas line. As you say a "very cool machine", but unfortunately, they are much too big for laying radial
/archives//html/Towertalk/2003-06/msg00080.html (10,252 bytes)


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