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Total 22 documents matching your query.

1. Topband: Greetings - list newcomer (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Thu, 12 Feb 2004 22:12:56 -0600
Hello Topbanders: I'm new to the list and am interested in improving my antenna situation here. I've merely dinked around with this band until I decided to get into the CQ 160 contest last year - and
/archives//html/Topband/2004-02/msg00211.html (8,317 bytes)

2. RE: Topband: Greetings - list newcomer (score: 1)
Author: "James C. Hall, M.D." <heartdoc@nwtcc.com>
Date: Fri, 13 Feb 2004 14:30:30 -0600
Thanks to all who replied to my query. I DO have ON4UN's book 'Low-band DXing' and will definitely dive into it deeply. I got several sources on the web as well and a lot of great advice - all printe
/archives//html/Topband/2004-02/msg00229.html (6,869 bytes)

3. Topband: Beverage Ant question (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sun, 23 Oct 2005 22:40:39 -0500
Hello: This year, only my 3rd year on topband, I decided to splurge and set up a 4 beverage antenna using 2 reversible (2 wire) antenna that are nearly orthogonal to each other. The first is oriented
/archives//html/Topband/2005-10/msg00231.html (7,941 bytes)

4. Re: Topband: Drake mods - was: What's best (your opinion) (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Fri, 16 Feb 2007 10:09:24 -0600
Tom you made mention of "second only to the Drake" in an earlier post regarding receiver performance. I would be interested in hearing about the Drake being used and how it's configured. I have a ver
/archives//html/Topband/2007-02/msg00163.html (9,293 bytes)

5. Re: Topband: reversible Beverage v none reversible Beverage (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sun, 9 Nov 2008 18:11:55 -0600
works I have 6 "center-fed" 2-wire, 2-port Beverages which have reflection transformers (or the equivalent) at both ends. They work very well in terms of directivity and deliver plenty of signal. I w
/archives//html/Topband/2008-11/msg00071.html (11,497 bytes)

6. Re: Topband: reversible Beverage v none reversible Beverage (answers) (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 15 Nov 2008 17:36:07 -0600
Hello All: This was an interesting thread and I decided to do a little test. It was mentioned that on some reversible beverage installations that on the reverse direction there was a noticeable decre
/archives//html/Topband/2008-11/msg00096.html (8,153 bytes)

7. Re: Topband: reversible Beverage v none reversible Beverage (answers) (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Mon, 17 Nov 2008 16:49:32 -0600
The first question that comes to mind is whether the difference in signal strength is due to a fault on the Beverage, or a due to a difference in the signals from the two directions... The comment th
/archives//html/Topband/2008-11/msg00107.html (10,712 bytes)

8. Re: Topband: Electrical height of short shunt fed tower? (score: 1)
Author: "James Hall" <heartdoc@nwtcc.com>
Date: Tue, 10 Nov 2009 19:12:32 -0600
This has been a very interesting thread and one that I took notes on. I will have a new system going up that will be 120 feet of Rohn 45 tower with large yagis at 60 and 120 feet - 48 ft. booms. I do
/archives//html/Topband/2009-11/msg00296.html (10,973 bytes)

9. Topband: Shunt tower feed question (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 30 Oct 2010 18:13:25 -0500
Hello All: New tower setup: 120 feet Rohn 45 with two large yagi's at the 120 and 60 foot level, both with 44 foot booms. The shunt feed is attached at the 55 foot level and the drop wire is about 4
/archives//html/Topband/2010-10/msg00143.html (7,949 bytes)

10. Topband: Shunt fed tower loading riddle (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 13 Nov 2010 16:15:03 -0600
Hello All: I?m continuing my attempts to load my shunt fed tower which is electrically longer than wavelength. At the tower, I managed to get the SWR down with a 500pf 10kV vacuum variable as the s
/archives//html/Topband/2010-11/msg00062.html (7,387 bytes)

11. Re: Topband: Shunt fed tower loading riddle (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sun, 14 Nov 2010 09:44:32 -0600
Thanks to all for the great replies. I particularly like the link on the doorknob capacitors. Interestingly, I had a carbon track on the lid of the Hoffman box. The box is grounded to the tower and t
/archives//html/Topband/2010-11/msg00064.html (9,815 bytes)

12. Topband: Shunt tower help (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 15 Jan 2011 16:22:43 -0600
Hello TB: I have a problem -I cannot seem to get a decent match either with Gamma or Omega matching. My situation is a complex one that doesn't lend well to modeling and I am forced to trying trial a
/archives//html/Topband/2011-01/msg00067.html (7,628 bytes)

13. Re: Topband: Shunt tower help (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 15 Jan 2011 20:15:11 -0600
Hello TB: Thanks so much for the great replies !! Bottom line is I need to insulate the tower from the guys. Several mentioned using a grid dipper to discover the actual resonant frequency of the tow
/archives//html/Topband/2011-01/msg00069.html (7,456 bytes)

14. Re: Topband: QSL from Gaby, OD5NJ on 160 m (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Mon, 13 Feb 2012 19:54:30 -0600
Yes, this is the way to do it. OD5NH was getting this bad rap too. You don't need to send a SAE to OD5NH either as he returns it via postcard - avoids suspicion by the police. Registered mail is quit
/archives//html/Topband/2012-02/msg00211.html (10,006 bytes)

15. Re: Topband: 160 meter elevated vertical (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 20 Oct 2012 10:39:24 -0500
" And you don't need a hail-mary super choke for the job. " Hi Guy: I'm going to try elevated radials on my shunt-fed tower. I was thinking about constructing an "Ugly Balun" for the job with 4" PVC
/archives//html/Topband/2012-10/msg00260.html (7,353 bytes)

16. Re: Topband: Help With First 80M 4-Square (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Mon, 23 Dec 2013 18:54:37 -0600
Hi Wayne: Instead of self-supporting elements for my 4-square, I used rope-supported wire elements hung from the top of my 120 foot tower. I used 4x4 posts in concrete to support the base of each ver
/archives//html/Topband/2013-12/msg00222.html (10,036 bytes)

17. Topband: Bad tower shunt capacitor (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Wed, 29 Jan 2014 18:26:39 -0600
I have an omega matched 120 foot tower and I apparently have a bad vacuum variable capacitor. Upon applying more than about 300 watts, the SWR goes off scale. Tuning it out and trying again, yields t
/archives//html/Topband/2014-01/msg00332.html (7,227 bytes)

18. Re: Topband: Bad tower shunt capacitor (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Wed, 29 Jan 2014 20:32:06 -0600
Thanks Steve: Not bad - I may try that ! :) The question in my mind was if there was an arc outside the caps, why would the SWR change ? Anyway, I may be missing something. I haven't been inside the
/archives//html/Topband/2014-01/msg00336.html (8,021 bytes)

19. Re: Topband: Bad tower shunt capacitor (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Thu, 30 Jan 2014 10:49:06 -0600
Jon: Thanks for this. This has crossed my mind since I use hose clamps to attach the wire from the top and bottom of the caps. I had used copper flashing between the two caps. I'll change that to a h
/archives//html/Topband/2014-01/msg00352.html (9,672 bytes)

20. Re: Topband: Bad tower shunt capacitor (score: 1)
Author: "James C. Hall, MD" <heartdoc@nwtcc.com>
Date: Sat, 1 Feb 2014 16:31:20 -0600
Just an update on this - last night FT5ZM was spotted briefly on 160M and I went down to listen for awhile. I didn't hear much and what I did hear I couldn't make myself believe it was them ! So I th
/archives//html/Topband/2014-02/msg00021.html (11,311 bytes)


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