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References: [ +from:rodman@buffalo.edu: 39 ]

Total 39 documents matching your query.

1. Topband: XMT and RCV antenna questions (score: 1): Author: David J Rodman MD <rodman@buffalo.edu>; Date: Sat, 28 Feb 2004 07:16:41 -0500; Presently, I have a 160m delta loop (apex up) for my transmit antenna. Loop is fed about 30' up one bottom corner and has a 75 ohm coaxial matching transformer. Station has two 140' towers spaced 150; /archives//html/Topband/2004-02/msg00322.html (7,484 bytes)
2. Topband: Beverage feedline suggestion (score: 1): Author: David J Rodman MD <rodman@buffalo.edu>; Date: Thu, 04 Mar 2004 00:01:16 -0500; My beverage antenna to Europe was cut down by new property owner. The best replacement configuration on my OWN property is 580' at 40 degrees. The only problem is the coax feed line is approx 600' fr; /archives//html/Topband/2004-03/msg00019.html (7,311 bytes)
3. Topband: Summary: Beverage feedline suggestions (score: 1): Author: David J Rodman MD <rodman@buffalo.edu>; Date: Sat, 06 Mar 2004 07:27:30 -0500; Thanks to all the people who responded to my inquiry about how to and what to feed my new beverage antenna with. I haven't acted yet, but the materials are on order. First, I decided to scrap the Min; /archives//html/Topband/2004-03/msg00056.html (8,499 bytes)
4. Topband: Angle of radiation to local stations? (score: 1): Author: "D. Rodman, MD" <rodman@buffalo.edu>; Date: Thu, 14 Oct 2004 14:50:04 -0400 (EDT); I did some on air testing with some bidirectional antennas for 160m and the results were somewhat surprising to me. It appeared the antenna which should have favored the direction of the local statio; /archives//html/Topband/2004-10/msg00070.html (7,393 bytes)
5. Topband: DX Engineering Bidirectional Beverage (score: 1): Author: "D. Rodman, MD" <rodman@buffalo.edu>; Date: Mon, 8 Nov 2004 12:35:06 -0500 (EST); I posted a review of the antenna on eham.net under the heading of Verticals and Wire Antennas. David J. Rodman, MD Assistant Clinical Professor Department of Ophthalmology Research Assistant Professo; /archives//html/Topband/2004-11/msg00043.html (6,838 bytes)
6. [TowerTalk] 80m 4Square Dipole VSWR question (score: 1): Author: "D. Rodman, MD" <rodman@buffalo.edu>; Date: Tue, 16 Nov 2004 21:19:00 -0500 (EST); I have a measured different resonance curves and corresponding VSWR for my 80m dipole array depending on which antennas I select. For example, the antennas are oriented NE, SE, SW, and NW. I have two; /archives//html/Topband/2004-11/msg00173.html (9,431 bytes)
7. Topband: Re: Close to earth Beverage (score: 1): Author: "D. Rodman, MD" <rodman@buffalo.edu>; Date: Fri, 19 Nov 2004 06:55:52 -0500 (EST); I believe on the ground makes little difference vs a foot or two above. My antennas at different heights. Where I know I go by or deer go by, the heights are not 4-6', I like them higher or lower. Sn; /archives//html/Topband/2004-11/msg00187.html (7,145 bytes)
8. Topband: 160m loop VSWR question (score: 1): Author: David J Rodman MD <rodman@buffalo.edu>; Date: Tue, 07 Dec 2004 07:02:13 -0500; I have two stations, lets call them RIGHT and LEFT. With regard to my loop antenna they are as follows. The antenna is apex UP and fed about 30' up from a bottom corner from the B tower. There is a 7; /archives//html/Topband/2004-12/msg00120.html (9,305 bytes)
9. Topband: Speaking of noise... (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Thu, 22 Dec 2011 23:03:09 -0500; Here is my situation. I am pretty sure noise is from switching power supplies. Unfortunately, it tends to put noise right where I don't want it. Like bottom of 160, 80 and 40m. Typically the noise is; /archives//html/Topband/2011-12/msg00527.html (6,679 bytes)
10. Topband: Unintentional (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Tue, 24 Jan 2012 18:52:00 -0500; Sorry if I seemed incompetent this morning at 1200Z with VP6T. My transceiver had a software malfunction and would not transmit down, no matter how many times I tried to tell it to do so. I had just; /archives//html/Topband/2012-01/msg00295.html (6,552 bytes)
11. Topband: K9AY model (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Sat, 4 Feb 2012 18:01:54 -0500; Hi does anyone happen to have an EZNEC (or similar file, source or description) that I can use to model the K9AY loop? I have a 150' distance at my location that I would be tempted to try a phasing a; /archives//html/Topband/2012-02/msg00046.html (6,809 bytes)
12. Topband: DXE Active Receive antenna question (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Sat, 18 Feb 2012 20:34:35 -0500; I should be operating the contest, but spent some of the afternoon troubleshooting my DXE circular receive array. One thing led to another and I decided to bench test one of the receivers. We pulled; /archives//html/Topband/2012-02/msg00291.html (7,578 bytes)
13. Topband: FCP wiring question (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Fri, 14 Sep 2012 06:32:32 -0400; I have all the materials for an inverted L, using K2AY FCP and have read his article attached to the web page. After I paid much more attention to the page, I noted that the highlighted diagrams seem; /archives//html/Topband/2012-09/msg00087.html (7,094 bytes)
14. Topband: Vertical with elevated transmission line? (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Thu, 25 Oct 2012 22:41:35 -0400; I was having an educational discussion with a friend tonight about the ramifications of feeding a vertical with an elevated transmission line. The situation would be he does not want to dig up the me; /archives//html/Topband/2012-10/msg00356.html (6,891 bytes)
15. Topband: FCP question (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Sat, 17 Nov 2012 16:08:56 -0500; Just came in from installing the inverted L and FCP. Tuned it with an SWR box at the antenna but have no connectors to attach coax so have to wait a day or so to put it on the air. This is an 80m ver; /archives//html/Topband/2012-11/msg00279.html (7,165 bytes)
16. Topband: Delta Loop vs Antenna Analyzer (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Mon, 3 Dec 2012 23:22:05 -0500; My 160m antenna died several weeks ago from a bad coax feed line and was restored just Sunday after the contest. I have tried several antenna analyzers and none seem to work with the loop antenna. I; /archives//html/Topband/2012-12/msg00097.html (7,412 bytes)
17. Topband: Brewster Angle (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Wed, 6 Feb 2013 12:20:43 -0500; I have been looking for information or opinions or experience if vertically polarized antenna receive enhanced low angle signal transmission when located near salt water only or is the situation equi; /archives//html/Topband/2013-02/msg00054.html (6,894 bytes)
18. Topband: Delta Loop Match (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Tue, 29 Oct 2013 17:40:05 -0400; Looking for some help matching my 160 loop. I made three changes to the system this year and the VSWR has increased to about 2:1 at resonance which is about the same frequency. Here is what I have. T; /archives//html/Topband/2013-10/msg00245.html (8,418 bytes)
19. Topband: Interference help (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Wed, 11 Dec 2013 23:01:17 -0500; I made this video to help me identify a source and get some help with a carrier and broadband interference noted on the low bands. I have identified two general signals. They have a significant AC hu; /archives//html/Topband/2013-12/msg00134.html (8,636 bytes)
20. Re: Topband: Topband Digest, Vol 133, Issue 30 (score: 1): Author: D Rodman MD <rodman@buffalo.edu>; Date: Tue, 28 Jan 2014 17:21:24 -0500; Thank you very much for inviting me. I was very impressed with the facility, how ideas were exchanged and attendees, although I do know them individually. I tried to advocate intravitreal injection o; /archives//html/Topband/2014-01/msg00300.html (17,943 bytes)

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