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141. Re: Topband: Best Height Above Ground for a Beverage RX Antenna (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 10 Jan 2007 14:45:42 -0800 (PST); I just wanted to say that my experience agrees with Larry. When I first started using beverages, I observed that most people used a height of 8 to 10 feet, so I assumed that must be the right thing t; /archives//html/Topband/2007-01/msg00189.html (8,563 bytes)
142. Re: Topband: Best Height Above Ground for a Beverage RX Antenna (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 10 Jan 2007 18:27:03 -0800; That's interesting. My beverages (at 2 to 3 feet) are OK on 160, good on 80 (I can work LP), and positively fabulous on 40 and 30, especially LP. As always, YMMV. Rick N6RK _________________________; /archives//html/Topband/2007-01/msg00200.html (9,194 bytes)
143. Re: Topband: noise (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sun, 14 Jan 2007 15:56:52 -0800 (PST); I don't know about Motorola, but Collins had a system with a 40 MHz receiver. However, it was just a noise blanker. The only thing unique was listening on 40 MHz instead of near the receive frequency; /archives//html/Topband/2007-01/msg00270.html (7,976 bytes)
144. Re: Topband: Norton preamp (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sat, 20 Jan 2007 09:38:34 -0800 (PST); The transformers are standard broadband receiving type transformers, which typically use hi-mu cores. Get a copy of "Transmission Line Transformers" to read about this. Additional comments: I have be; /archives//html/Topband/2007-01/msg00335.html (10,316 bytes)
145. Re: Topband: arizona report (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 25 Jan 2007 11:23:14 -0800 (PST); Similar situation here, 20 acres, 6 beverages, a receive dipole 1/4 mile from any power lines. A few weeks ago, when DF2PY was 599 on the east coast (per spots), I think I could tell he was in there,; /archives//html/Topband/2007-01/msg00392.html (8,766 bytes)
146. Re: Topband: VF - It is what it is (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 29 Mar 2007 13:28:53 -0800; Or you could use a pi network as a lumped delay in place of the separate piece of cable. Then you don't have to worry about cable aging at all. Rick N6RK ____________________________________________; /archives//html/Topband/2007-03/msg00158.html (7,930 bytes)
147. Re: Topband: Omni VII performance on 160m (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 4 Jul 2007 19:51:19 -0700; The concept of IP3 is that you can describe nonlinearity in a single number. This presupposes that IP3 is independent of excitation level below some threshold, which is typically something like 10 dB; /archives//html/Topband/2007-07/msg00005.html (7,426 bytes)
148. Re: Topband: Multiple Ground Systems (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 16 Aug 2007 13:17:32 -0700; Here is something I always wondered about. Let's say you have verticals spaced 1/8 wave. A radial from one vertical headed towards the other is 1/16 wave long. When it hits the "bus" wire, it simply; /archives//html/Topband/2007-08/msg00031.html (9,998 bytes)
149. Re: Topband: RX antenna testing (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 21 Aug 2007 11:35:27 -0700 (PDT); I usually test new RX antenna ideas out by building a 2.5 MHz version and listening to WWV. You might consider doing that. Rick N6RK _______________________________________________ Topband mailing li; /archives//html/Topband/2007-08/msg00073.html (6,996 bytes)
150. Re: Topband: RX 4 square (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 21 Aug 2007 21:56:05 -0700; As I have previously posted, you can do much better the the DXE active whip with a cheap homebrew system. Instead of the DXE amplifier, just use a Mini-circuits transformer, such as T36-1 for $6.55.; /archives//html/Topband/2007-08/msg00080.html (8,020 bytes)
151. Re: [TowerTalk] Topband: RX 4 square (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 22 Aug 2007 09:45:07 -0700; I was the person who made the postings. If a voltage follower is replaced by a transformer, there will be a change in the GAIN of the system, but not the SENSITIVITY of the system. As Tom has pointed; /archives//html/Topband/2007-08/msg00089.html (11,614 bytes)
152. Re: [TowerTalk] Topband: RX 4 square (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 22 Aug 2007 12:58:43 -0700 (PDT); I got good results with Mini-Circuits transformers. Have you tried those? Did you use a preamp after the transformer? We're all envious of your location. Most locations have substantial local noise a; /archives//html/Topband/2007-08/msg00092.html (10,790 bytes)
153. Re: Topband: AIM4170 antenna analyzer (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 4 Sep 2007 15:33:16 -0700 (PDT); Depends on what "good" means. I am 6 miles from the nearest BC station and the AIM4170 is useless measuring my 90 foot 160 meter vertical. The manufacturer refuses to modify the software to allow a B; /archives//html/Topband/2007-09/msg00014.html (9,219 bytes)
154. Re: Topband: Extra isolation transformers? (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sun, 16 Sep 2007 08:06:45 -0700 (PDT); You can get excellent feedline isolation by using a Mini-Circuits T1-6 transformer. There is very little insertion loss and the capacitance from primary to secondary is very small. Because of the ext; /archives//html/Topband/2007-09/msg00105.html (8,547 bytes)
155. Re: Topband: "EWE" 3:1transformer (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sun, 16 Sep 2007 09:45:29 -0700 (PDT); http://www.minicircuits.com/pdfs/T3-1T-X65.pdf Rick N6RK _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topba; /archives//html/Topband/2007-09/msg00106.html (7,011 bytes)
156. Re: Topband: NCC and phased Active verticals follow up (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 24 Oct 2007 12:33:54 -0700 (PDT); When I tested the ARAV, I experienced spurs that were generated in the electronics of the ARAV itself. No way to fix those. A filter afterwards doesn't help and you can't insert one ahead of the elec; /archives//html/Topband/2007-10/msg00154.html (8,410 bytes)
157. Re: Topband: NCC and phased Active verticals follow up (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 24 Oct 2007 13:41:30 -0700 (PDT); They don't publish anything on that. The LC tanks that are selected with jumpers appear to be constructed of ordinary parts with 10% or 20% tolerance. The effect of those could be modeled w.r.t. ampl; /archives//html/Topband/2007-10/msg00155.html (7,949 bytes)
158. Re: [RFI] [TowerTalk] Testing & Comparing Compact Fluorescents? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 31 Oct 2007 14:24:48 -0800; I have found that the lamps themselves make very little noise. However, unless you go to the considerable trouble to get magnetic ballasts, the electronic ballasts are very RF noisy. I still have my; /archives//html/Topband/2007-10/msg00198.html (7,355 bytes)
159. Re: Topband: One way propagation (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 15 Nov 2007 18:30:22 -0800 (PST); Polarization and linearity are independent of each other. A medium can rotate polarization or not whether it is linear or not. The issue is not linearity but rather reciprocity. In reciprocal media,; /archives//html/Topband/2007-11/msg00129.html (9,496 bytes)
160. Topband: 3X5A and other contest activity (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Fri, 23 Nov 2007 21:26:12 -0800 (PST); 3X5A was awesome coming into the west coast Friday night, a solid 599. Worked them on the first call. Also worked them on 80. D4C was also very strong here, but I wasn't able to bust the pileup. KV4F; /archives//html/Topband/2007-11/msg00194.html (6,750 bytes)

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