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201. Re: Topband: Spiderbeam pole (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 09 Jan 2009 09:46:45 -0700
Actually, for a T-top, the approximation that is closest is to add HALF of the top loading wire to the vertical portion. For example, a 90 ft vertical with an 80 ft top loading wire looks like a 90 +
/archives//html/Topband/2009-01/msg00075.html (7,768 bytes)

202. Re: Topband: Impedance of two wires to ground? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Wed, 14 Jan 2009 16:04:28 -0800 (PST)
See page 197 of: http://www.pmillett.com/Books/FTR_ref_data.pdf The first formula is for common mode and the second is for differential mode. Rick N6RK _______________________________________________
/archives//html/Topband/2009-01/msg00132.html (8,159 bytes)

203. Re: Topband: Nobody can hear me (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sat, 24 Jan 2009 22:49:37 -0800 (PST)
1. 160 can have weird conditions where you think you are not getting out, or the other station is listening on a beverage pointed away from you. You should try more stations in different directions.
/archives//html/Topband/2009-01/msg00250.html (8,238 bytes)

204. Re: Topband: locals (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 27 Jan 2009 11:16:58 -0800 (PST)
. The trouble with a receive filter is that the transmitter may have broadband noise, and it won't help that. I run SO2R in 160 meter contests by using a loop antenna for the second receiver. The loo
/archives//html/Topband/2009-01/msg00298.html (8,171 bytes)

205. Re: Topband: QSB surfing (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 12 Feb 2009 17:41:11 -0800 (PST)
Occasionally, I experience what might be called "brainlock". For example, in a recent contest, I kept hearing a K6 station as K7... I kept repeating his call as K7... and he kept sending K6... which
/archives//html/Topband/2009-02/msg00072.html (9,095 bytes)

206. Re: Topband: Receive Splitter or Not? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 24 Mar 2009 14:16:47 -0700 (PDT)
Rick N6RK _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband
/archives//html/Topband/2009-03/msg00077.html (8,860 bytes)

207. Re: Topband: VK9GMW (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sun, 29 Mar 2009 13:02:13 -0700 (PDT)
I worked them at my sunrise this morning while they were running JA's. I really liked how they operated on 1823.5 and listened for me on 1825.5, just beyond the JA QRM. They had very little QSB on th
/archives//html/Topband/2009-03/msg00097.html (7,253 bytes)

208. Re: Topband: Wideband x-former... (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 30 Mar 2009 19:38:05 -0700
My MonstIR Yagi has a 50 ohm to 22 ohm balun that is good from 7 MHz to 54 MHz (I measured it on a network analyzer). In your case, you only need an "un-un" not a "bal-un". Even easier. You can simpl
/archives//html/Topband/2009-03/msg00120.html (8,217 bytes)

209. Re: Topband: Wideband x-former... (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 31 Mar 2009 13:36:56 -0700 (PDT)
Yes, these low permeability materials are necessary to get maximum power handling and (similutaneously) wide bandwidth. However, in order to make such optimum transformers, it is also necessary to st
/archives//html/Topband/2009-03/msg00127.html (9,278 bytes)

210. Topband: QST article (May 2009, p 66) on antenna relays (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 24 Apr 2009 08:31:35 -0700
I wrote an article for Hints and Kinks on antenna relays that may be of interest to low band opearators. It appears in the current issue of QST (May 2009, page 66). It describes how to modify commonl
/archives//html/Topband/2009-04/msg00071.html (9,577 bytes)

211. Re: Topband: Probably-dumb question re current mode chokes on RXantennas (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 19 May 2009 07:36:54 -0700
I haven't read the patent, but I did purchase a couple of these for evaluation and trace out the schematic. The INPUT has a resonating system using jumpers to select the frequency. This is a shunt ta
/archives//html/Topband/2009-05/msg00078.html (8,664 bytes)

212. Re: Topband: 160 m phased verticals wiht 1/8 lamda spacing ? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 21 May 2009 13:32:24 -0700 (PDT)
The possible reason not to use 1/8 spacing is that the drive impedance is lower, and ground losses will increase. If you have an excellent ground system, you might actually get the extra 1 dB, otherw
/archives//html/Topband/2009-05/msg00096.html (7,828 bytes)

213. Re: Topband: two phased verticals for 160 m (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Mon, 1 Jun 2009 11:42:01 -0700 (PDT)
wrote: I did a lot of modeling of 3/8 wave spacing. It is not very useful for a 2 element array. I determined that for 3/8 wl spacing you need 7 elements as described here: http://www.n6rk.com/7_hex_
/archives//html/Topband/2009-06/msg00011.html (8,233 bytes)

214. Re: [TowerTalk] Topband: Filters for Detector (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sat, 20 Jun 2009 11:46:00 -0700
A BNC tee and a termination? There are also dedicated 50 ohm feedthru terminations for scopes. The gotcha here is that the filters would have to be matched, or they will decrease the accuracy. Matchi
/archives//html/Topband/2009-06/msg00072.html (7,584 bytes)

215. Re: [TowerTalk] Topband: Filters for Detector (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 22 Jun 2009 21:54:52 -0700
"Matched" refers to the filters having identical response to each other. As opposed to matching the characteristic impedance of the system they are in. Rick N6RK _____________________________________
/archives//html/Topband/2009-06/msg00074.html (7,994 bytes)

216. Re: Topband: Common mode chokes (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 14 Jul 2009 20:42:14 -0700
I have used CAT5 pair to make transmitting transformers at the legal limit up to 7 MHz. They give you a very good 100 ohm line for no effort. I have also used them for short (30 foot) feedlines for c
/archives//html/Topband/2009-07/msg00047.html (9,441 bytes)

217. Topband: How Helically Wound Verticals Really Work (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 15 Jul 2009 21:46:18 -0700
The concept of the helically wound vertical (HWV) is appealing: no lossy loading coil, just a low loss wire. The "proof" of this is that you can run a kW and the antenna does not get hot. It is easy
/archives//html/Topband/2009-07/msg00058.html (11,271 bytes)

218. Re: Topband: How Helically Wound Verticals Really Work (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 16 Jul 2009 16:14:21 -0700 (PDT)
Yes of course. About 30 years ago, I had a big rotary wafer switch driven by a rotary solenoid. Each pulse of the rotary solenoid turned the shaft 30 degrees. It had 12 positions, which allowed 6 tap
/archives//html/Topband/2009-07/msg00070.html (9,127 bytes)

219. Re: Topband: Shielded Loop (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 16 Jul 2009 16:16:35 -0700 (PDT)
Watch for the article on loops in the next issue of the National Contest Journal (NCJ). Rick N6RK _______________________________________________ Topband mailing list Topband@contesting.com http://li
/archives//html/Topband/2009-07/msg00071.html (7,650 bytes)

220. Re: Topband: T - vertical improvement (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 21 Jul 2009 09:15:37 -0700
I have seen this statement many times. In actual tests on 20 meters, a half wave vertical with no radials is indistinguishable from a quarter wave vertical with 32 radials. Comparing a half wave vert
/archives//html/Topband/2009-07/msg00089.html (7,764 bytes)

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