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1. Re: [TowerTalk] 2 Element Parasitic Vertical (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 24 Nov 2009 12:46:00 -0500; Why not put a small matching network at the base of the parasitic element with a motor driven capacitor. Then you can tune it above and below resonance from the shack while watching the signal streng; /archives//html/Towertalk/2009-11/msg00445.html (11,960 bytes)
2. Re: [TowerTalk] Ground rod connection question (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 19 Nov 2009 11:20:52 -0500; Ray, You are correct. The talk about connecting to a single point on the tower probably comes from the crowd that does not understand what a "single point ground system" is. It has nothing to do with; /archives//html/Towertalk/2009-11/msg00363.html (10,158 bytes)
3. Re: [TowerTalk] Ground mounting vs roof mounting verticals (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 22 Oct 2009 11:54:34 -0500; I said that "A vertical above your beam will not work. An elevated vertical must have resonant radials". At the end of your post you say the same thing. With a quarter wave vertical mounted on the ma; /archives//html/Towertalk/2009-10/msg00365.html (12,244 bytes)
4. Re: [TowerTalk] Ground mounting vs roof mounting verticals (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 21 Oct 2009 23:01:45 -0500; A vertical above your beam will not work. An elevated vertical must have resonant radials. 73 Gary K4FMX _______________________________________________ ______________________________________________; /archives//html/Towertalk/2009-10/msg00354.html (15,385 bytes)
5. Re: [TowerTalk] Reply - KW3000 with 1/2 inch Drill Motor -Wrongassumption in responses (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 15 Oct 2009 17:59:09 -0500; Maybe some confusion here? A typical AC/DC motor has the fields wired in series with the armature. This allows the motor to run on either ac or dc voltage as it does not depend on the rotating fields; /archives//html/Towertalk/2009-10/msg00232.html (12,774 bytes)
6. Re: [TowerTalk] LightningProtectionDevicesPolyP, Response (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 12 Sep 2009 15:14:09 -0500; Well, I may be wrong too! I haven't been associated with Polyphaser for about 10 or 15 years. The original company was sold several years ago and I had heard that some of the products were made cheap; /archives//html/Towertalk/2009-09/msg00172.html (10,276 bytes)
7. Re: [TowerTalk] LightningProtectionDevicesPolyP, Response DAVIS RF Co. (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 11 Sep 2009 16:57:11 -0500; Polyphaser has used gas tubes in their coax protection devices from day one. The reason for the series capacitor is to allow the gas tube to fire before enough energy is passed into the circuit follo; /archives//html/Towertalk/2009-09/msg00154.html (12,263 bytes)
8. Re: [TowerTalk] Question on Lightning Protection Devices, Polyphaser, etc. (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 10 Sep 2009 21:47:54 -0500; Probably not usable out of the design range. The Polyphaser devices have a series capacitor in them. On UHF it is a rather small capacitor and I don't think it is large enough for HF to pass. The hig; /archives//html/Towertalk/2009-09/msg00140.html (9,747 bytes)
9. Re: [TowerTalk] two benefits of postings on Re: Resonance is over rated (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 9 Aug 2009 23:12:37 -0500; I think that he was referring to the end result of the total circuit. It may have capacitive and inductive components in it but the capacitive ones will exhibit a negative reactance and the inductive; /archives//html/Towertalk/2009-08/msg00162.html (12,368 bytes)
10. Re: [TowerTalk] "Faraday Shield" for Coax and Control Lines (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 8 Aug 2009 22:19:47 -0500; That is not exactly why PP suggests a maximum of 70 feet of ground wire. The reason is that the long wire becomes too inductive to be of much use when longer. But that will vary with the type of soi; /archives//html/Towertalk/2009-08/msg00144.html (11,740 bytes)
11. Re: [TowerTalk] bonding to Rohn tower (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 2 Aug 2009 22:07:05 -0500; Polyphaser was recommending using copper strap long before they were selling it. They only started selling it as a convenience to customers that didn't know where to get it when buying their other pr; /archives//html/Towertalk/2009-08/msg00018.html (9,601 bytes)
12. Re: [TowerTalk] bonding to Rohn tower (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 2 Aug 2009 21:56:21 -0500; That comes from the fact that when buying copper, strap gives you more surface area and lower inductance than round wire for a given amount of copper cost. And for those that would advocate copper pi; /archives//html/Towertalk/2009-08/msg00017.html (8,769 bytes)
13. Re: [TowerTalk] Tower as ground (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 13 Jul 2009 10:41:56 -0500; Assuming you are talking about a lightning ground. The tower by itself is not a good ground, as described. It can be considered a supplemental ground rod and should have several ground rods installed; /archives//html/Towertalk/2009-07/msg00199.html (8,449 bytes)
14. Re: [TowerTalk] Hardline ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 7 May 2009 19:05:27 -0400; Hi Jim, I see where you are coming from now. In my last response I thought that you were talking about loss because of a mismatch to the generator and the generator could not put out full power beca; /archives//html/Towertalk/2009-05/msg00137.html (10,024 bytes)
15. Re: [TowerTalk] Hardline ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 7 May 2009 12:46:07 -0400; That is not applicable to this situation: "Mismatch loss is the ratio of power delivered, to power available" That (mismatch loss) is speaking of a load impedance not matching the source impedance s; /archives//html/Towertalk/2009-05/msg00127.html (9,097 bytes)
16. Re: [TowerTalk] Ladderline. What Kind ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 23 Apr 2009 13:13:37 -0400; I think what a lot of people don't understand about open wire line is how it accomplishes its "low loss" and doesn't care if the swr is high or not. It has to do mostly with I squared R losses in the; /archives//html/Towertalk/2009-04/msg00689.html (11,290 bytes)
17. Re: [TowerTalk] Hardline ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 20 Apr 2009 23:31:58 -0400; Yes Bob, that is exactly right. My point was that you can not express any additional loss due to mismatch unless you know what the matched loss of the line is in the first place. Just to say that "w; /archives//html/Towertalk/2009-04/msg00582.html (11,508 bytes)
18. Re: [TowerTalk] Hardline ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 20 Apr 2009 18:12:07 -0400; A 1/2 wavelength (or multiple of) of 75 ohm hardline could be used and when hooked to a 50 ohm antenna, 50 ohms will be seen at the other end of the 75 ohm line. 73 Gary K4FMX _______________________; /archives//html/Towertalk/2009-04/msg00566.html (10,464 bytes)
19. Re: [TowerTalk] Hardline ? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 20 Apr 2009 18:08:39 -0400; I hate to start something here,, but where does the "0.18 dB additional loss come from with any length of line"? Mismatch in and of itself does not necessarily represent loss. 73 Gary K4FMX ________; /archives//html/Towertalk/2009-04/msg00565.html (9,441 bytes)
20. Re: [TowerTalk] Vertical in pond (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 18 Mar 2009 12:03:03 -0400; Just because they are a "broadcast station" doesn't necessarily mean they knew what they were doing when they built it. I know of a station that is built on top of a large rocky hill. It has terrible; /archives//html/Towertalk/2009-03/msg00532.html (11,453 bytes)

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