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21. Re: Topband: Pre-Amp Shielding (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Mon, 22 Sep 2003 10:00:44 -0400
The line loss has little to do with the problem. Its the signals leaking into the coax thats the killer. I thought coax was well shielded until I put 40 db of preamp in the shack. The RG-58 picked up
/archives//html/Topband/2003-09/msg00095.html (8,306 bytes)

22. Topband: Marine Radials (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Tue, 30 Sep 2003 23:44:30 -0400
Gentlemen: My vertical has the house and driveway to the north, blocking buried radial additions. Thirty feet to the south is a fresh water spring creek, 60 feet wide. I started installing clandestin
/archives//html/Topband/2003-10/msg00000.html (6,710 bytes)

23. Topband: Preamp filter insertion loss (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Fri, 10 Oct 2003 11:28:06 -0400
Having originally shrugged this statement off, I subsequently decided I must be missing something. Say a 20 dB preamp/filter has an insertion loss of 3 dB and is installed at the receive antenna fee
/archives//html/Topband/2003-10/msg00050.html (7,271 bytes)

24. Re: Topband: Geomag activity and sunspot cycle (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Sun, 9 Nov 2003 22:43:07 -0500
This is extremely depressing news. I only have 149 countries so far........and could well be SK by 2007. As condx were much better a few months ago, hopefully we will still get some good openings th
/archives//html/Topband/2003-11/msg00053.html (7,825 bytes)

25. Re: Topband: Phased Pennants: Staggered? (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Tue, 11 Nov 2003 03:06:55 -0500
lobe tried a For over a year now I have been using a rotary, two-loop endfire setup, and the thing works. Actual gain is about -45 dB, but with a K9AY preamp at the feedpoint, modified for 20 dB of
/archives//html/Topband/2003-11/msg00068.html (9,498 bytes)

26. Re: Topband: Ground Radials (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Wed, 12 Nov 2003 12:17:36 -0500
My research indicates that these dissimilar metal reactions can *only* take place in the presence of air & moisture (the electrolyte). One year old copper radial to aluminum plate connections, pre-t
/archives//html/Topband/2003-11/msg00087.html (8,358 bytes)

27. Re: Topband: Re:1. Topband from Uganda last night. 5X1X - CommentfromS9SS (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Fri, 12 Dec 2003 11:31:08 -0500
Last night, 5X1X peaked in central Florida from 0100-0105Z. After that he quickly faded. Last winter, S9SS was Q-5 here for longer periods of time, and earlier than this. Those were better conditions
/archives//html/Topband/2003-12/msg00120.html (8,133 bytes)

28. Re: Topband: Pennant Transformer (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Sat, 17 Jan 2004 15:46:28 -0500
Kyle, if you wind your own, use the FT114-77 toroid with 17 turns / 4 turns. This will give you lowest SWR, least amount of turns and good common mode isolation. To realize the Pennant's modeled radi
/archives//html/Topband/2004-01/msg00158.html (8,108 bytes)

29. Topband: Fw: J6DX / 160M (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Sun, 18 Jan 2004 19:41:54 -0500
Good news for those needing St. Lucia on topband. I have been on since 2000 & this is first St. Lucia operation that I know of. Thanks to Scott & good luck on your Dx'pedition. 73, Doug / NX4D ______
/archives//html/Topband/2004-01/msg00167.html (7,006 bytes)

30. Re: Topband: BDR redux (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Thu, 5 Feb 2004 19:17:38 -0500
The Orion sure sounds like a FB receive rig to me. I am still using the trusty FT-1000MP, but with some exciting modifications for topband reception. Using a SCAF-1 audio filter with two back-to-bac
/archives//html/Topband/2004-02/msg00092.html (10,065 bytes)

31. Re: Topband: BDR redux (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Fri, 6 Feb 2004 10:08:13 -0500
If all signals entering the antenna input of a receiver were weak signals, including noise, then receiver specs would be of little concern. Audio gain could be turned wide open for easy copy. Presie
/archives//html/Topband/2004-02/msg00107.html (11,277 bytes)

32. Topband: K4OJ Update (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Thu, 12 Feb 2004 20:31:10 -0500
With sadness I pass this news to the Topband reflector: Doug / Nx4d Dear friends: In September of 2002 K4OJ sat at this computer and wrote a poignant obituary honoring his father, W1CW, who had died
/archives//html/Topband/2004-02/msg00202.html (7,326 bytes)

33. Re: Topband: Local noise environment (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Mon, 16 Feb 2004 14:38:06 -0500
At Buzz City, Florida, a 50 kVa line passes within one half mile of the house. When the summer air conditioner season begins, the power company throws in a capacitor bank, which corrects the power f
/archives//html/Topband/2004-02/msg00256.html (8,092 bytes)

34. Re: Topband: buried radial problems. (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Wed, 22 Dec 2004 14:43:41 -0500
In general, you want the radiation resistance to be large compared to the other two (or the other two to be small in comparison to the radiation resistance). With a short antenna, you make the radiat
/archives//html/Topband/2004-12/msg00281.html (9,656 bytes)

35. Topband: Re: S-meter (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Sat, 8 Jan 2005 12:07:33 -0500
My big wish is that we'd always do the S meter reality check..... I want to know just how strong my signals are... not an ego boost! I wish the equipment manufacturers would give us two S-meter selec
/archives//html/Topband/2005-01/msg00131.html (8,457 bytes)

36. Re: Topband: Key-clicks FT1000MK-V field (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Wed, 19 Jan 2005 11:07:31 -0500
There are good alternatives to these radios. Buy the alternatives! Steer other hams away from Yaseu, and talk about their attitude on the air. Tell the ham vendors you aren't buying Yaseu, and why. I
/archives//html/Topband/2005-01/msg00236.html (11,140 bytes)

37. Re: Topband: Sunrise/Sunset Tables on the Internet (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Thu, 27 Jan 2005 12:12:40 -0500
If you go to: http://www.sunrisesunset.com/ one can see times for some US, Canadian and major world wide cities. Unfortunately, I do not think this website will allow one to select a non US city of c
/archives//html/Topband/2005-01/msg00302.html (8,088 bytes)

38. Re: Topband: Another DXpedition 160 Vertical Idea (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Fri, 28 Jan 2005 11:12:34 -0500
This comparison is dependent on the quality of the ground under and around the antennas. Up to half of the far field signal strength is derived from the ground reflected wave. If no ground radials a
/archives//html/Topband/2005-01/msg00312.html (9,286 bytes)

39. RE: Topband: toploading of shunt fed tower (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Wed, 9 Feb 2005 12:11:08 -0500
Summation, the Force 12 C4XL on top of an elevated, insulated base, series fed Rohn 25 tower provides capacitive top loading equivalent to approximately 35 feet As additional info, F-12 states that t
/archives//html/Topband/2005-02/msg00121.html (7,776 bytes)

40. Re: Topband: High and low angles (score: 1)
Author: "Doug Waller" <NX4D@comcast.net>
Date: Sat, 5 Mar 2005 08:21:54 -0500
The vertical and inverted-V both radiate poorly at 40-45 elevation degrees. I would think that these radiation angles may be more useful than straight up. There are relatively unrecognized antennas
/archives//html/Topband/2005-03/msg00050.html (8,419 bytes)

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