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221. [TowerTalk] unusual RF Choke design (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 21 Nov 2001 11:21:04 -0500; An RF choke and an inductor are the same thing. In this application you create a reactance and that reactance is in series with the OUTSIDE of the shield. That is true if you use a solenoid or a pan; /archives//html/Towertalk/2001-11/msg00448.html (10,205 bytes)
222. [TowerTalk] 160m shunt feed followup (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 1 Oct 2001 10:30:00 -0400; First on suggestions of high-pass filters...or the even worse the useless suggestion of a small variable capacitor. Also, BC interference normally gets strong at night because then you have the combi; /archives//html/Towertalk/2001-10/msg00008.html (9,479 bytes)
223. [TowerTalk] 160m shunt feed followup (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 1 Oct 2001 20:26:48 -0400; True. Not true! Unfortunately this is what some analyzers assume. It is reliable with lumped components. It is unreliable when you are measuring a system with transmission lines. It is possible to h; /archives//html/Towertalk/2001-10/msg00017.html (8,543 bytes)
224. [TowerTalk] Tower, 80m vertical and BC hash (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 1 Oct 2001 20:26:48 -0400; Let's suppose nothing funny is going on with a poor ground someplace. It could be that the tower and feed system and receiver's BC band input impedance is "resonant" on the BC band while on 80 meter; /archives//html/Towertalk/2001-10/msg00018.html (8,582 bytes)
225. [TowerTalk] 160m shunt feed followup (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 06:05:16 -0400; That's true. If you leave it sit on one frequency and change capacitance, minimum Z (assuming it goe through a minimum) is resonance and Z=R. 73, Tom W8JI W8JI@contesting.com List Sponsored by AN Wi; /archives//html/Towertalk/2001-10/msg00051.html (8,128 bytes)
226. [TowerTalk] Cow-Proof Beverage (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Oct 2001 16:03:55 -0400; I'm in that situation. Last year there were 200+cows working on my antennas including 2000 pound bulls. First, I have to bury and cover most of the feedlines because young cows eat or chew anything.; /archives//html/Towertalk/2001-10/msg00075.html (9,130 bytes)
227. [TowerTalk] Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 4 Oct 2001 12:10:12 -0400; The worse thing anyone ever did to understanding how RF systems work was present SWR as "match efficiency" or "percent reflected power". That is absolutely incorrect Jon, unless you happen to be fee; /archives//html/Towertalk/2001-10/msg00105.html (9,714 bytes)
228. [TowerTalk] MORE - AL-1200 arcing residue during QRO RTTY contesting (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 5 Oct 2001 10:28:31 -0400; Hi John, In contest RTTY duty, you must change the blower of the AL1200 to a high speed blower. The blower is fine for extended CW and SSB duty at full power, but not RTTY contests. The manual should; /archives//html/Towertalk/2001-10/msg00122.html (9,559 bytes)
229. [TowerTalk] Re: Remove enamel from CU wire (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 9 Oct 2001 16:56:10 -0400; I agree that the enamel could just be left on with no ill effects, but: The main reason is bare wire is easier to work with, when soldering hundreds of connections. The cost of the wire is insignific; /archives//html/Towertalk/2001-10/msg00196.html (8,942 bytes)
230. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 10 Oct 2001 20:17:09 -0400; Perhaps you misunderstood what was said, because that is clearly not correct. The only mechanism that increases bandwidth is loss in the line. Nothing else. 73, Tom W8JI W8JI@contesting.com List Spo; /archives//html/Towertalk/2001-10/msg00218.html (8,497 bytes)
231. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 07:26:35 -0400; Yuri is somehow trying to mix in an antenna that has more bandwidth because the conductors are thicker and more lossy, with a discussion about feedlines. In this case, we are talking only about the f; /archives//html/Towertalk/2001-10/msg00228.html (10,455 bytes)
232. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 07:26:35 -0400; What Wes is saying is ALWAYS correct Mike. Except for effects of losses: 1.) The SWR on the 75-ohm line remains constant with length of the 75-ohm line. 2.) The SWR on the 50-ohm line remains consta; /archives//html/Towertalk/2001-10/msg00229.html (11,064 bytes)
233. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 12:24:25 -0400; Hi Mike, VSWR is always properly measured or referenced to the surge impedance of a line! SWR is, by definition, the ratio of across and through vectors along a distance of line. even if we agree to; /archives//html/Towertalk/2001-10/msg00237.html (11,018 bytes)
234. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 12:24:25 -0400; Hi Yuri, The personal attacks aren't really necessary. I try hard to make sure what I say is accurate. The only reason I am involved in reflectors is to learn or help others lean, not to insult peopl; /archives//html/Towertalk/2001-10/msg00238.html (10,516 bytes)
235. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 19:37:04 -0400; maxwell analyzed that well in Reflections. As a matter of fact Walt thought the common misrepresentation.... that the stub in a coaxial dipole was responsible for increased bandwidth.... was so impor; /archives//html/Towertalk/2001-10/msg00242.html (11,337 bytes)
236. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Oct 2001 06:58:51 -0400; Except for balance, there is no difference between that arrangement and the arrangement in a coaxial dipole. A stub across the feedpoint would have to have a few ohms of Zo to do significant reactan; /archives//html/Towertalk/2001-10/msg00251.html (9,218 bytes)
237. [TowerTalk] Re: Force12 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Oct 2001 12:14:14 -0400; Hi Yuri, We always can learn useful things when people disagree. Rather than call you names and insult you in return, let me point out something useful to people using stubs. While I certainly respec; /archives//html/Towertalk/2001-10/msg00261.html (10,419 bytes)
238. [TowerTalk] Theory's great... but what about the 'How To'? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Oct 2001 15:11:01 -0400; You can do very well with three programs. One is TLA in the Antenna Handbook, another a Smith Chart program, and also something like EZNEC. With those three programs ( or similar programs) you can h; /archives//html/Towertalk/2001-10/msg00264.html (8,585 bytes)
239. [TowerTalk] How to books (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Oct 2001 20:20:44 -0400; Very good suggestions!!! I suggested programs, because they are good ways to learn, but another good book is Antennas and Transmissions Lines by John Kuecken. Kuecken taught EM and antenna system de; /archives//html/Towertalk/2001-10/msg00268.html (8,465 bytes)
240. [TowerTalk] Phasing of 4 in line verticals (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Oct 2001 10:15:41 -0400; obtained? Gain comes from pattern interference, it's like squeezing a balloon with your hands to make it stick out more in one direction. In order to obtain gain, you have to remove energy from a di; /archives//html/Towertalk/2001-10/msg00295.html (8,785 bytes)

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