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Total 37 documents matching your query.

1. Topband: Half slopers mounted short distances from ground. (score: 1)
Author: (
Date: Thu, 18 Jan 2001 20:02:05 EST
Doug and the rest of the Top Band gang, Here is what I have observed on a 40 foot tower with half slopers, and I look at the half sloper mounted a small percentage of a wavelength from ground in a mu
/archives//html/Topband/2001-01/msg00184.html (12,205 bytes)

2. Topband: CFA actual pictures. (score: 1)
Author: (
Date: Sun, 2 Jan 2000 18:39:49 EST
Top Banders, I know everyone was interested in the CFA, and came across some pictures on the internet of the MW stations using them. Thought it might be interesting for everyone to see even though th
/archives//html/Topband/2000-01/msg00007.html (6,857 bytes)

3. Topband: MFJ-259B Analyzer Versus Autek antenna analyst etc? (score: 1)
Author: (
Date: Sun, 26 Dec 1999 19:02:38 EST
Wonder if anyone can comment on which antenna/SWR analyzer is the best one to buy for work on 160 meter antenna systems (with HF in general being the second reason for purchase). Wonder what analyzer
/archives//html/Topband/1999-12/msg00290.html (6,948 bytes)

4. Topband: Loading Coil (score: 1)
Author: (
Date: Mon, 18 Oct 1999 21:32:33 EDT
Hello Tom, I run a 68 foot half sloper (1/8 wave length on 160 meters) mounted on my 40 foot tower, and really have a blast on 160 with it. You can see my antenna in the March 1998 issue of QST. Here
/archives//html/Topband/1999-10/msg00111.html (8,828 bytes)

5. Topband: Half sloper. (score: 1)
Author: (
Date: Thu, 23 Sep 1999 17:42:53 EDT
Ted, I had the opposite problem that you had. I put up a 68 foot 1/8 wave half sloper for 160 meters (it is an electrical 1/4 wave with inductive loading at the feed point). You can see my actual ant
/archives//html/Topband/1999-09/msg00119.html (7,330 bytes)

6. Topband: Mystery 160 meter cw beacons. (score: 1)
Author: (
Date: Sun, 4 Apr 1999 04:32:56 EDT
EAA01496 Sender: Precedence: bulk X-List-Info: X-Sponsor: W4AN, KM3T, N5KO & AD1C I have been trying to find information on the CW
/archives//html/Topband/1999-04/msg00020.html (8,349 bytes)

7. Topband: RG58 vs. RG59 at 1.8MHZ (score: 1)
Author: (
Date: Mon, 26 Apr 1999 21:51:27 EDT
Dan, Following are product specifications that Beldon Cable lists for both RG58 and RG59 type cable. I am not sure what the Sat. Cable characteristics are, but thought the following information still
/archives//html/Topband/1999-04/msg00109.html (7,166 bytes)

8. Re: Topband: T-antenna dimensions? (score: 1)
Date: Mon, 18 Jan 2010 12:48:57 EST
Hello Mike, EZNEC model of a T configuration using a 50 foot vertical section indicates each leg of the T needs to be 61 feet long (total length of the top of the T would be 61 x 2 = 122 feet), and t
/archives//html/Topband/2010-01/msg00143.html (8,083 bytes)

9. Re: Topband: Contest (score: 1)
Date: Mon, 1 Feb 2010 11:40:25 EST
I used to think the reason big guns did not hear me were due to their running directional receiving antennas, but I now suspect the majority of the problem has to do with the very narrow receive fil
/archives//html/Topband/2010-02/msg00003.html (7,419 bytes)

10. Re: Topband: Radial requirements for 1/2 wave vertical? (score: 1)
Date: Fri, 19 Feb 2010 07:46:02 EST
I'm certainly not trying to argue with you, Dick; perhaps I'm way off base. I'm not an antenna expert. Why don't we see what the others on the Topband list have to say about the radial requirements f
/archives//html/Topband/2010-02/msg00165.html (8,966 bytes)

11. Re: Topband: half size flag antenna--NW6S (score: 1)
Date: Wed, 10 Mar 2010 13:38:53 EST
work on 80, 40 30, & 20meters. Hello Jim, I'm a pretty new user of antenna modeling software, but let me take a crack at answering your question and lets see how it corresponds to other responses you
/archives//html/Topband/2010-03/msg00059.html (7,646 bytes)

12. Topband: To short or not short unused coil turns (score: 1)
Date: Sat, 2 Oct 2010 21:56:13 EDT
Typically I see comments that unused coil turns should be shorted, but logic tells me that for maximum coil efficiency unused coil turns should not be shorted unless the application of unused turns r
/archives//html/Topband/2010-10/msg00011.html (6,998 bytes)

13. Re: Topband: To short or not short unused coil turns (score: 1)
Date: Tue, 5 Oct 2010 10:34:19 EDT
Thanks to everyone that responded to my original question, and below is a summary of the responses I received along with a test I performed last night. I did receive a few direct responses to my ques
/archives//html/Topband/2010-10/msg00028.html (8,832 bytes)

14. Topband: W1FB preamp failure (score: 1)
Date: Sun, 2 Jan 2011 14:33:20 EST
Built a W1FB preamp (Aug 1988 QST) for use with my 4.5 square shielded loop which is located in my shack, and the MC1350 IC gets permanently altered when I transmit on 160 meters using my 53 foot bas
/archives//html/Topband/2011-01/msg00002.html (8,466 bytes)

15. Re: Topband: W1FB preamp failure (score: 1)
Date: Tue, 4 Jan 2011 10:52:09 EST
Thanks for all the responses (many responses received). Below is a summary of the responses I received, along with the actual fix I came up with that has solved the W1FB preamp failure problem I was
/archives//html/Topband/2011-01/msg00006.html (9,287 bytes)

16. Re: Topband: Do short beverages "work"? (score: 1)
Date: Mon, 24 Jan 2011 10:11:59 EST
-- I too wondered what the pattern of the beverage looked like as its length was reduced so I did a simple model using EZNEC demo for a terminated 1.8 MHZ beverage (500 ohm termination) mounted 5 fee
/archives//html/Topband/2011-01/msg00144.html (7,936 bytes)

17. Re: Topband: KD9SV Preamp with BF-981 (score: 1)
Date: Sat, 5 Mar 2011 15:40:27 EST
Tom, The modification you mention for using a BF981 with the KD9SV preamp is as follows : Install a 22 ohm resistor between the 100 ohm resistor and the source of the dual gate mosfet. The 100 ohm re
/archives//html/Topband/2011-03/msg00022.html (8,042 bytes)

18. Topband: Testing for common mode noise (score: 1)
Author: Don Kirk <>
Date: Thu, 18 Aug 2011 11:22:03 -0400
A few weeks ago I installed 3 half size point fed pennants (each aimed approximately 120 apart), and have been wondering if I need to install any chokes and/or ground rod on the feedline near the fe
/archives//html/Topband/2011-08/msg00033.html (8,641 bytes)

19. Re: Topband: Testing for common mode noise (score: 1)
Author: Don Kirk <>
Date: Mon, 22 Aug 2011 10:50:36 -0400
I received numerous responses regarding my proposed common mode noise test, and here is a summary of the responses. 1) The majority of respondents supported my proposed test. 2) There was really only
/archives//html/Topband/2011-08/msg00050.html (8,041 bytes)

20. Re: Topband: Testing for common mode noise (score: 1)
Author: Don Kirk <>
Date: Wed, 24 Aug 2011 07:00:23 -0400
Second, a common mode choke does not in any way degrade the signal nor the performance of the antenna. but after more offline discussions with Jim about a posting by W8JI warning that a improper valu
/archives//html/Topband/2011-08/msg00058.html (7,775 bytes)

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