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281. Re: Topband: V160HD Titanex (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 06 Jul 2010 19:21:35 -0700
Somebody correct me if I am mistaken, but the Titanex antennas are mainly a collection of pieces of tubing. It would be easy to reverse engineer the dimensions. I see that Titanium tubing is availabl
/archives//html/Topband/2010-07/msg00017.html (9,047 bytes)

282. Re: Topband: V160HD Titanex (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 07 Jul 2010 07:42:54 -0700
This reference says that 7075-T6 yield strength is 70 to 80 ksi. http://www.makeitfrom.com/data/?material=7075_Alum&type=Mechanical With comparable strength to density ratios, you should be able to r
/archives//html/Topband/2010-07/msg00021.html (12,777 bytes)

283. Re: Topband: Beverages (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sun, 11 Jul 2010 10:20:05 -0700
I will note that at my QTH (ymmv:-), almost any antenna of any kind except another vertical will hear better than my vertical transmitting antenna. In evaluating a beverage, I always compare it to a
/archives//html/Topband/2010-07/msg00047.html (8,154 bytes)

284. Re: Topband: Beverages (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Mon, 12 Jul 2010 10:32:36 -0700
When I first acquired my 20 acres, the first thing I did was put up a 1300 ft long beverage, 10 feet high. It had terrific front to back ratio ... regardless of termination. I eventually determined t
/archives//html/Topband/2010-07/msg00055.html (8,955 bytes)

285. Re: Topband: Shunt-fed tower vs. T-vertical (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Wed, 14 Jul 2010 18:34:51 -0700
There are 10-32 nuts that hold down the "brushes". There is enough extra thread to get a spade lug and a nylok nut on top of each existing nut (don't unscrew the existing nuts and screw up the brushe
/archives//html/Topband/2010-07/msg00078.html (8,662 bytes)

286. Re: Topband: PORTABLE RX ANTENNAS (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 29 Jul 2010 07:43:16 -0700
I've done a lot of experimenting trying to find the perfect "portable" RX antenna. First let me mention that I use T posts with plastic pipe slipped over them to hold up my open wire line, at a heigh
/archives//html/Topband/2010-07/msg00124.html (8,956 bytes)

287. Re: Topband: Optimum number of radials for given wire length (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 13 Aug 2010 09:29:19 -0700
The dB loss numbers vs feed point impedance don't make sense to me. To get 3 dB loss, the feed point impedance should be 70 ohms, not 52 ohms. The dB numbers seem to be off by a factor of 2, IMHO, l
/archives//html/Topband/2010-08/msg00017.html (8,616 bytes)

288. Re: Topband: RX and TX questions (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 25 Aug 2010 22:12:15 -0700
For an example of varactor tuning, see: http://www.n6rk.com/loopantennas/NCJ_loop_antenna_N6RK.pdf You shouldn't need a preamp with this loop. Rick N6RK ______________________________________________
/archives//html/Topband/2010-08/msg00042.html (7,948 bytes)

289. Re: Topband: BOG questions (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Tue, 19 Oct 2010 09:52:58 -0700
The losses are so high on a BOG that it is unlikely that more than 350 feet would be useful. Rick N6RK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
/archives//html/Topband/2010-10/msg00087.html (7,644 bytes)

290. Re: Topband: The AM Brick Wall (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Thu, 25 Nov 2010 16:53:07 -0800
Sorry to be a wet blanket, but now that the AM broadcast band extends to 1.7 MHz, you really have to use an elliptic function (AKA Cauer) filter, not a Chebyshev. There are several of those on the ma
/archives//html/Topband/2010-11/msg00112.html (9,729 bytes)

291. Re: Topband: Any ideas on the legal outcome here? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 28 Dec 2010 10:42:03 -0800
I found the patent (7423588). It has the "secret" schematic of the DXE active antenna, the one they don't publish. Ya gotta love this patent; claim 1 basically covers any phased array antenna system
/archives//html/Topband/2010-12/msg00138.html (8,195 bytes)

292. Topband: Do short beverages "work"? (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sun, 23 Jan 2011 07:39:07 -0800
I have been reading these testimonials about how well short beverages work. It depends on what you mean by "work". They might be useful antennas, but whether they are functioning as beverages is anot
/archives//html/Topband/2011-01/msg00128.html (8,569 bytes)

293. Re: Topband: 160 contest and SO2R (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Tue, 1 Feb 2011 17:33:17 -0800
Maybe but OTOH, I have had this happen to me when I was trying to listen to a weak signal on a beverage and didn't hear the QRL at first. Sometimes I may be listening for an entire minute without tra
/archives//html/Topband/2011-02/msg00013.html (8,336 bytes)

294. Re: Topband: LINEAR vs TOP LOADING (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sat, 23 Apr 2011 11:33:30 -0700
Some KLM Yagi owners have changed to high Q loading coils made by W6ANR and have been happy with the results. Rick N6RK _______________________________________________ UR RST IS ... ... ..9 QSB QSB -
/archives//html/Topband/2011-04/msg00101.html (7,605 bytes)

295. Re: Topband: 160m vertical with "top loading" (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sat, 23 Apr 2011 11:47:08 -0700
I tried to read this article, but it had equal parts of truth and fiction. (The fictional parts were duly noted, but it is still confusing). It would be a lot more readable if you just stated what is
/archives//html/Topband/2011-04/msg00104.html (12,738 bytes)

296. Re: Topband: Pixel Technologies Magnetic RX Loop (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sun, 8 May 2011 08:54:35 -0700
My reading of Baum's papers is that the so-called Moebius loop has 4 times the output impedance of a single turn loop and 1/4 of the bandwidth of a single turn loop. If the object is to get broadband
/archives//html/Topband/2011-05/msg00007.html (7,161 bytes)

297. Re: Topband: Pixel Technologies Magnetic RX Loop (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sun, 8 May 2011 12:58:26 -0700
The question is: why a "Moebius" loop? Note 8 is about loops in general, and says nothing about Moebius loops. Virtually any loop design will have nulls broadside to the loop, and even Baum doesn't c
/archives//html/Topband/2011-05/msg00008.html (8,330 bytes)

298. Re: Topband: Anyone using a DX Engineering DXE-ARAH2-1p active dipole antenna? (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sun, 10 Jul 2011 12:43:34 -0700
I tried one of those, but the isolation from the feedline was insufficient, so the feedline became the antenna. The problem is that the feedline is a vertical "antenna" and produces a whopping signal
/archives//html/Topband/2011-07/msg00002.html (7,532 bytes)

299. Re: Topband: Anyone using a DX Engineering DXE-ARAH2-1p active dipole antenna? (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 11 Jul 2011 11:50:48 -0700
The DXE unit already includes common mode choking internally. It is unlikely that inserting an additional common mode choke in series would help much. What is really needed is transformer coupling, a
/archives//html/Topband/2011-07/msg00005.html (9,865 bytes)

300. Re: Topband: Antenna Matching Question (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Thu, 1 Sep 2011 12:49:04 -0700
You can remote the tuning cap by using 1/2 wl of coax. This will be something in excess of 150 feet, depending on velocity factor. The antenna won't know the 1/2 wave is there. Rick N6Rk ____________
/archives//html/Topband/2011-09/msg00003.html (9,906 bytes)

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