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Total 13 documents matching your query.

1. Re: Topband: T - vertical improvement (score: 1): Author: "Roy" <royanjoy@ncn.net>; Date: Tue, 21 Jul 2009 09:01:59 -0500; "A couple questions for the group.... 1. Supposedly I will end up with higher radiation resistance and efficiency, and I assume higher effective radiated power. But what am I giving up?" Current maxi; /archives//html/Topband/2009-07/msg00086.html (6,888 bytes)
2. 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)
3. Re: Topband: T - vertical improvement (score: 1): Author: "Thomas F. Giella NZ4O" <nz4o@tampabay.rr.com>; Date: Wed, 22 Jul 2009 11:05:25 -0400; Around ten or so years ago K4TR and I did allot of experimenting with a long (3/8-1/2 wave) T vertical on 160 meters. We found that not did one not have to extend the radials further as the highest c; /archives//html/Topband/2009-07/msg00093.html (8,076 bytes)
4. Re: Topband: T - vertical improvement (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Wed, 22 Jul 2009 05:38:43 -0600; The radial system you have will be fine. What you give up is matching simplicity. The T will need a base series capacitor as a minimum and an L-network if you like a 1:1 VSWR. At 1.5 kW the 370 pF ca; /archives//html/Topband/2009-07/msg00094.html (8,433 bytes)
5. Re: Topband: T - vertical improvement (score: 1): Author: Greg Chartrand <w7my@yahoo.com>; Date: Wed, 22 Jul 2009 13:53:10 -0700 (PDT); I messed around with an extended Tee last season that I could also use as a low dipole; its documented here. http://webpages.charter.net/w7my/page2.html Greg -- Greg Chartrand - W7MY Richland, WA. DN; /archives//html/Topband/2009-07/msg00098.html (7,795 bytes)
6. Re: Topband: T - vertical improvement (score: 1): Author: "Edward Swynar" <gswynar@durham.net>; Date: Wed, 22 Jul 2009 17:21:04 -0400; "...What you give up is matching simplicity. The T will need a base series capacitor as a minimum and an L-network if you like a 1:1 VSWR. At 1.5 kW the 370 pF cap will see 10 kV RMS. You are looking; /archives//html/Topband/2009-07/msg00099.html (8,170 bytes)
7. Re: Topband: T - vertical improvement (score: 1): Author: Mike <mikestahoe@sbcglobal.net>; Date: Thu, 23 Jul 2009 12:44:34 -0700 (PDT); Great discussion, is there a good source of vacuum variables (at reasonable prices) for this application. Everything I've found has been in the $300+ dollar range? The radial system you have will be; /archives//html/Topband/2009-07/msg00102.html (8,328 bytes)
8. Re: Topband: T - vertical improvement (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Thu, 23 Jul 2009 23:21:43 -0400; Wait a second. 1500W into 35 or so ohms is like 6.6A... running through -j235 ohm capacitor is more like 1500Vrms/2100V peak. 10kVrms across a 370pF cap at 1.8MHz is 42A flowing through. That's near; /archives//html/Topband/2009-07/msg00105.html (8,441 bytes)
9. Re: Topband: T - vertical improvement (score: 1): Author: K4SAV <RadioIR@charter.net>; Date: Thu, 23 Jul 2009 23:34:23 -0500; WX5G wrote: At 1.5 kW the 370 pF cap will see 10 kV RMS. You are looking at a vacuum variable capacitor. Mike wrote: Great discussion, is there a good source of vacuum variables (at reasonable prices; /archives//html/Topband/2009-07/msg00106.html (8,211 bytes)
10. Re: Topband: T - vertical improvement (score: 1): Author: Herb Schoenbohm <herbs@vitelcom.net>; Date: Fri, 24 Jul 2009 09:52:05 -0300; There is a lower cost approach to tune out inductive reactance then the more expensive vacuum variable especially in the 15KV range. Also bread slicers can be a problem with corrosion, pitting, and b; /archives//html/Topband/2009-07/msg00111.html (10,107 bytes)
11. Re: Topband: T - vertical improvement (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Fri, 24 Jul 2009 08:47:53 -0600; T-vertical, 10 kV? It appears I punched 15,000 W into the calculator. The signal improvement going from the resonant T to one with longer horizontal wires is quite minimal, about 0.1 dB. Dave WX7G __; /archives//html/Topband/2009-07/msg00112.html (8,689 bytes)
12. Re: Topband: T - vertical improvement (score: 1): Author: wb6rse1@mac.com; Date: Fri, 24 Jul 2009 08:25:33 -0700; I was going to respond "Max Gain Systems" for vacuum variables to the subsequent post asking that but it's not necessary here. Plenty of air variables that can take it. _______________ My shunt feed; /archives//html/Topband/2009-07/msg00113.html (9,127 bytes)
13. Re: Topband: T - vertical improvement (score: 1): Author: "Robert Carroll" <w2wg@comcast.net>; Date: Fri, 24 Jul 2009 12:17:41 -0400; I have often done this, but N4GG educated me on another aspect of the old micas. While they usually carry a voltage rating, they normally do not carry a current rating. I never worried about this unt; /archives//html/Topband/2009-07/msg00116.html (12,655 bytes)

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