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Total 9 documents matching your query.

1. [TowerTalk] Comments by K9YC (score: 1): Author: Dan Hearn <n5ardxcc@gmail.com>; Date: Sun, 22 Jun 2014 19:12:55 -0700; -- Maybe I should have used a few more words to explain. In the fine Yagi tests described by K7LXC and N0AX in their book on tri band Yagis. each companies reference for their gain ratings is given.; /archives//html/Towertalk/2014-06/msg00266.html (10,877 bytes)
2. Re: [TowerTalk] Comments by K9YC (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 22 Jun 2014 19:31:34 -0700; I think I do understand the problem. Antennas and feedlines are passive networks, and follow the principle of reciprocity -- that is, they function the same on RX and they do on TX. Common mode curre; /archives//html/Towertalk/2014-06/msg00267.html (8,147 bytes)
3. Re: [TowerTalk] Comments by K9YC (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sun, 22 Jun 2014 22:36:43 -0400; On 2014-06-22 10:12 PM, Dan Hearn wrote: The coax saw many places on the 3 bands where the feed point impedance was not 52 ohms. That will result in spill over of current from the inside of the shiel; /archives//html/Towertalk/2014-06/msg00268.html (12,807 bytes)
4. Re: [TowerTalk] Comments by K9YC (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Sun, 22 Jun 2014 22:08:19 -0500; I have an old Mosley TA33 and yes they did recommend grounding one side of the driven element to the boom with a strap. If I remember right they also recommended a choke made of several (8 or 10) tur; /archives//html/Towertalk/2014-06/msg00269.html (16,425 bytes)
5. Re: [TowerTalk] Comments by K9YC (score: 1): Author: Dan Hearn <n5ardxcc@gmail.com>; Date: Sun, 22 Jun 2014 20:28:40 -0700; Thanks for your comments guys. I am very confused. There have been a number of things in QST saying that the current from the center conductor goes into one half of the dipole DE and the remaining cu; /archives//html/Towertalk/2014-06/msg00270.html (15,571 bytes)
6. Re: [TowerTalk] Comments by K9YC (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 23 Jun 2014 00:03:27 -0400; There are commercial antennas which use a quarter wave line with the top near the DE and the bottom connected to the feedline outer shield a quarter wave down the feed line. This should develop a hig; /archives//html/Towertalk/2014-06/msg00271.html (16,538 bytes)
7. Re: [TowerTalk] Comments by K9YC (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 23 Jun 2014 10:18:26 +0100; You can then try inserting a choke at the feedpoint in the EZNEC model and see how it does indeed change the SWR on the feedline! The SWR is bound to change under those conditions. If you have a low; /archives//html/Towertalk/2014-06/msg00273.html (8,532 bytes)
8. Re: [TowerTalk] Comments by K9YC (score: 1): Author: Ward Silver <hwardsil@gmail.com>; Date: Mon, 23 Jun 2014 08:28:23 -0500; A clarification - there are two basic mechanisms in play regarding the effect of the feed line's outer surface. Each influences the antenna pattern and SWR but in different ways, sometimes creating t; /archives//html/Towertalk/2014-06/msg00277.html (11,691 bytes)
9. Re: [TowerTalk] Comments by K9YC (score: 1): Author: Ward Silver <hwardsil@gmail.com>; Date: Mon, 23 Jun 2014 11:53:54 -0500; My post should have read "...and restricts current flow TO BE from the inside of the shield to..." Sorry about that. Too many edits :-) The point of the choke balun is to block the current trying to; /archives//html/Towertalk/2014-06/msg00280.html (8,702 bytes)

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