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21. Re: Topband: EWEs and radials (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sun, 23 Mar 2008 21:09:23 -0500
My simulations do not show the ground resistance making any significant difference to the take-off angle for an EWE. A really poor ground made the take-off angle of a single element version go up by
/archives//html/Topband/2008-03/msg00067.html (8,782 bytes)

22. Re: Topband: DX Enginerring Snap-on Ferrite Beads (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 17 Apr 2008 08:55:39 -0500
The real reason for not having the wires exit the tower at any place other than at the bottom is for lightning protection. A lightning strike on the tower may decide to run down the wires exiting the
/archives//html/Topband/2008-04/msg00063.html (8,147 bytes)

23. Re: Topband: Rx 4 square switching box (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sun, 15 Jun 2008 12:18:30 -0500
..."I'm trying to be careful with the grounds isolation, i.e. the verticals ground system not connected to the central box and feedline output through a separate windings xfmr."... ...."But could be
/archives//html/Topband/2008-06/msg00028.html (8,629 bytes)

24. Re: Topband: 2 "EWE's" (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Tue, 19 Aug 2008 22:45:23 -0500
Sorry I couldn't decript "bi-<BR>>", but I will take a stab at an answer anyway. There are several ways to feed two EWEs, phased broadside (side by side end fire cells in phase), phased endfire, or i
/archives//html/Topband/2008-08/msg00054.html (8,289 bytes)

25. Re: Topband: How to get started on 160? (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 28 Aug 2008 09:44:48 -0500
KI4YAN wrote: Hi all, my name is Jacob, and I'm looking to get started on 160M AM. ..... ....I have a dual 6SN7 regen, and am working on a transmitter involving a pair of 6BQ6 modulating another pair
/archives//html/Topband/2008-08/msg00100.html (9,208 bytes)

26. Re: Topband: Inverted "L" vs." T" (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 08 Oct 2008 11:19:41 -0500
W7RH wrote: Further with the T portion as top loading the feed point radiation resistance will be greater for a given vertical height. This when coupled with an excellent ground system of 1/4 wave ra
/archives//html/Topband/2008-10/msg00043.html (8,515 bytes)

27. Re: Topband: [Topband] Inverted "L" vs." T" (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 08 Oct 2008 13:05:22 -0500
N6RK wrote: The higher radiation resistance and lower ground loss of the inverted L is illusory, because the additional radiation represents horizontallly polarized waves, which tend to be inefficien
/archives//html/Topband/2008-10/msg00045.html (8,784 bytes)

28. Re: Topband: [Topband] Inverted "L" vs." T" (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 09 Oct 2008 15:59:24 -0500
No you don't get something for nothing. If you look at the radiated patterns you can see that. As far as the ground loss difference between an L and a T, the answer is unclear as to which has the mos
/archives//html/Topband/2008-10/msg00065.html (12,329 bytes)

29. Re: Topband: [Topband] Inverted "L" vs." T" (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Fri, 10 Oct 2008 01:58:55 -0500
If you just modeled a vertical with low elevated radials and did not add any additional loss to the model, the answer is likely to be significantly in error. This is another case where NEC significan
/archives//html/Topband/2008-10/msg00071.html (11,375 bytes)

30. Re: Topband: Beverage antenna ground (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 30 Oct 2008 21:33:10 -0500
Ground rod impedance varies a lot depending on your soil. In Florida I used 4 ft ground rods for receiving antennas and they measured about 50 to 70 ohms. That was measured at 2 KHz. I don't know wha
/archives//html/Topband/2008-10/msg00171.html (9,146 bytes)

31. Re: Topband: Feedpoint voltage (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Tue, 18 Nov 2008 10:40:25 -0600
For a single series cap used for tuning an inverted L (or T), the amount of capacitance you need varies depending on the height of the vertical section and the length of the top wire. The amount of v
/archives//html/Topband/2008-11/msg00112.html (8,920 bytes)

32. Re: Topband: Vee Beams (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Fri, 12 Dec 2008 09:00:58 -0600
For a sloping terminated vee starting at 110 ft and sloping to ground, I don't think it will beat a 160 meter vertical no matter how long you make the legs. That is just too low to the ground. If you
/archives//html/Topband/2008-12/msg00136.html (8,017 bytes)

33. Re: Topband: K9AY-Loop ? (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Tue, 13 Jan 2009 15:51:15 -0600
It sounds like your N/S loop has a problem. You should have a much better F/B than front to side. Check out everything associated with the NS loop, the termination resistor, the relay, and the wiring
/archives//html/Topband/2009-01/msg00121.html (7,205 bytes)

34. Re: Topband: Beverage coax grounding (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 07 Feb 2009 17:41:43 -0600
Good advice signal-wise, however, if the feedline is long and you happen to have a lot of lightning, you will probably find that close strikes cause the transformer to arc-over, destroying the transf
/archives//html/Topband/2009-02/msg00019.html (8,231 bytes)

35. Re: Topband: Bobtail curtain (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 30 Mar 2009 15:39:07 -0500
There are two possibilities, both of which will produce high angle signals like that. 1. Are you perhaps looking at the end fire pattern? That's about the angle you will have off the ends, although t
/archives//html/Topband/2009-03/msg00110.html (8,730 bytes)

36. Re: Topband: Bobtail curtain (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 30 Mar 2009 15:51:38 -0500
K4SAV wrote: Put the source at the top of the center wire. That will give the same answer.... That statement that needs a little correcting. Feedling the bobtail at the top of the center wire will gi
/archives//html/Topband/2009-03/msg00111.html (6,956 bytes)

37. Re: Topband: 160m Sloper on Crank-up tower (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 20 Apr 2009 16:26:32 -0500
It's difficult to make a 160 sloper work very well with only a 54 ft tower. (That's a quarter wave sloping wire, not a half wave sloping dipole.) The configuration that works the best is one in which
/archives//html/Topband/2009-04/msg00058.html (10,375 bytes)

38. Re: Topband: 160m Sloper on Crank-up tower (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 20 Apr 2009 21:46:46 -0500
KQ0B wrote: "I have a L bracket affixed to the top section for the connection utilizing PL-259." and: "Impediance is 60 ohms but can see 50 ohms at 2.000mhz" and: "my prob is not working dx it is get
/archives//html/Topband/2009-04/msg00061.html (7,890 bytes)

39. Re: Topband: Good or bad conductivity (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sun, 26 Apr 2009 10:12:24 -0500
Here in Alabama we have real red clay. It turns to slippery goo when it gets saturated with water, and turns to pottery in the summer. Even though it has a lot of iron content, it isn't very conducti
/archives//html/Topband/2009-04/msg00081.html (8,739 bytes)

40. Re: Topband: Common mode chokes (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Fri, 10 Jul 2009 12:00:57 -0500
Common mode noise gets into the antenna from the feedline due to an unbalanced to balanced transition that may not be sufficiently choked. The noise comes from mainly two places, either radiated onto
/archives//html/Topband/2009-07/msg00040.html (9,500 bytes)

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