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21. Topband: Re: ON4UN Antenna (score: 1)
Author: royanjoy@ncn.net (Roy Koeppe)
Date: Sat, 16 Oct 1999 12:38:17 -0500
"Toroids are lucky to make a Q of a hundred unless the reactance required is low, and they suffer from heating because losses are concentrated in a small area that isn't exposed to airflow." Hi Tom,
/archives//html/Topband/1999-10/msg00102.html (7,692 bytes)

22. Topband: Re: ON4UN Antenna (score: 1)
Author: royanjoy@ncn.net (Roy Koeppe)
Date: Sun, 17 Oct 1999 13:31:37 -0500
I'm taking liberty to forward this from being posted on Antennas Reflector. "An interesting analysis by Dr Sevick in his book 'Building and using baluns and ununs' in appendix IV. He analyzed the los
/archives//html/Topband/1999-10/msg00106.html (7,403 bytes)

23. Topband: Re: Loading Coil (score: 1)
Author: royanjoy@ncn.net (Roy Koeppe)
Date: Mon, 18 Oct 1999 18:43:46 -0500
Tom, I presume you are planning what is normally referred to as a "half sloper". That is a quarter-wave-resonant element fed at one end, either at the ground or against the side of a tower. It is gen
/archives//html/Topband/1999-10/msg00110.html (7,035 bytes)

24. Topband: Re: DC motor for turning remote cap (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 3 Jan 2004 17:26:42 -0600
Concerning: "Can someone suggest a dc motor for turning a remote capacitor on an inverted L? Sears has a battery operated screwdriver on sale for $9.98, but it is a 150rpm. Any suggestions would be a
/archives//html/Topband/2004-01/msg00033.html (7,041 bytes)

25. Topband: Re: Local noise (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 14 Feb 2004 15:18:18 -0600
"At the suggestion of a number of people, I have put a 30-second MP3 recording of my noise on my web site at www.qsl.net/n4zr/160noise.mp3. I'd appreciate it if anyone who has time (and maybe an osci
/archives//html/Topband/2004-02/msg00250.html (6,717 bytes)

26. Topband: Re: short dipoles (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 17 Oct 2004 12:27:45 -0500
'Reality check' concerning: "It's inverted V configuration, center at 38 feet and...(etc.)." This is comparable to erecting a 10M horizontal antenna at 2.5 feet? Would anybody really do that? 73, Roy
/archives//html/Topband/2004-10/msg00078.html (6,336 bytes)

27. Topband: Re: high pass filters (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 22 Nov 2004 15:02:21 -0600
Asked, "I was wondering if anyone on the reflector had any information for a source of highpass filters that could be placed in line with a transceiver?" A common, 'Tee-Antenna-Tuner' is an effective
/archives//html/Topband/2004-11/msg00223.html (6,632 bytes)

28. Topband: Re: feeding a (folded) unipole (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 13 Jan 2005 08:20:03 -0600
Asked: "Hi. Is there anyone who has used a folded unipole with sucess who would like to share with me, the proper method to feed it to get a decent match some say a L/C network if so what would be th
/archives//html/Topband/2005-01/msg00175.html (6,709 bytes)

29. Topband: Re: INV-L Bazooka (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 16 Feb 2005 07:43:01 -0600
Asked, "Greetings all, I have heard about an Inverted-L Bazooka type antenna that is a 1/4 wave long. It is supposed to be lower in noise than the true inverted-l. If anyone has any diagrams/photos/w
/archives//html/Topband/2005-02/msg00174.html (7,341 bytes)

30. Re: Topband: evaluating shunt fed... (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 13 Apr 2005 09:34:24 -0500
Asked, "At the current time, there is only 22 radials connected - which I plan to increase to about 100 radials. My question is mainly, what impedance should I be seeing with this electrical length a
/archives//html/Topband/2005-04/msg00114.html (6,572 bytes)

31. Re: Topband: un-un 'balun' (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 31 May 2005 10:34:41 -0500
Asked, "Hi Anyone have a good drawing/picture or description how to make a heavy duty UN-UN balun ? I would like to get mail to la6fja@gmail.com if you have a good tip I plan to make a stack of 40m y
/archives//html/Topband/2005-06/msg00001.html (6,939 bytes)

32. Re: Topband: folded Marconi (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 24 Jul 2005 08:43:00 -0500
K7RX wrote... "I recently took down my Alpha Delta DX-A twin sloper and want to put up something different. I am not quite ready to shunt feed my tower yet so am looking at ideas for some sort of inv
/archives//html/Topband/2005-07/msg00012.html (7,328 bytes)

33. Re: Topband: 160M ground radials (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 21 Aug 2005 09:08:41 -0500
About... "Hello, Ground radials are suppose to reduce ground losses (right?) I know this sounds crazy, but please just humor me okay! Instead of using, let say 14 gauge wire for ground radials, how a
/archives//html/Topband/2005-08/msg00057.html (7,093 bytes)

34. Re: Topband: matching low Z ants to 50 ohms (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 22 Sep 2005 09:44:42 -0500
About, "I'm looking for advice about how to efficiently match my 160m inverted-L to 50 ohms. Here's what's motivating this question: My 160m inv-L is about 60ft tall with a 100ft long horizontal sect
/archives//html/Topband/2005-09/msg00067.html (7,169 bytes)

35. Re: Topband: QRO un-un (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 2 Jan 2006 03:11:43 -0600
Was asked, "...I am interested in the case of matching a 160 meter inv-L with good ground (1.5:1 unun), for 1.5 KW with a safety margin: perhaps a 2+ KW continuous rating. This is a single-band appli
/archives//html/Topband/2006-01/msg00011.html (7,283 bytes)

36. Re: Topband: Cushcraft MA 160V efficiency (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 17 Jan 2006 04:12:15 -0600
Asked, "I see Cushcraft has a new 160m vertical that is 30 -36 ft tall with 3 foot stinger on top directly above coil with short capacity spokes - given say 40 radials, as in PORTABLE operation - wit
/archives//html/Topband/2006-01/msg00257.html (6,850 bytes)

37. Re: Topband: 300 ohm twin lead INV L (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 6 Mar 2006 08:03:02 -0600
Asked, "Anyone have any tips on making an inverted-L out of 300 Ohm twin lead? What is a good length? I can get about 72 feet vertical . What length radials and how many?" Phil W8UV Phil, There's no
/archives//html/Topband/2006-03/msg00037.html (6,617 bytes)

38. Re: Topband: building an INV L... (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 12 May 2006 09:28:17 -0500
Concerning: "I've been reading that a 0.25wl isn't necessarily the best length for a 160M inverted-L ... that it's better to make it somewhat longer. What is the best length, and why?" A quarter wave
/archives//html/Topband/2006-05/msg00014.html (7,128 bytes)

39. Re: Topband: QST Jun 06 RX Loop (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 13 May 2006 11:23:13 -0500
"The June, 2006 QST has an article about a 160m RX loop. Comments, advice welcome." 73, Tim K3HX Tim, et al, I just received the rag here. Very interesting this article, in light of the many discussi
/archives//html/Topband/2006-05/msg00016.html (7,181 bytes)

40. Re: Topband: power rating of un-un (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 6 Nov 2006 11:00:27 -0600
About: "I a message of another subject I posted the question below. Since I did not get any replies, here I go again; I made an unun using a T-200-2 with a 19 turn bi-filiar winding using 1 mm enamel
/archives//html/Topband/2006-11/msg00036.html (7,086 bytes)

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