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Total 189 documents matching your query.

181. Re: Topband: New Inv-L Questions (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Sat, 13 Mar 2021 07:10:19 -1000
Hi Pete. Modeling your antenna with the horizontal wire 30' above GND an EZNEC sweep across the band shows R varying from 27 to 34 ohms with X varying from -j55 to +j55 ohms. Modeling your antenna wi
/archives//html/Topband/2021-03/msg00121.html (8,410 bytes)

182. Re: Topband: Elementary Inverted L questions (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Thu, 25 Mar 2021 06:08:06 -1000
An EZNEC model of your antenna (height of 35') shows it to be resonant at 1865 kHz. The minimum SWR was adjusted to 2:1 by adding GND loss of 8 ohms. SWR is all you need to tune the antenna. Is minim
/archives//html/Topband/2021-03/msg00162.html (9,730 bytes)

183. Re: Topband: 160 meter 1/8 wave (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Thu, 1 Apr 2021 10:48:11 -1000
Hi Doug, for now I will assume you mean an inverted-L with apex at 1/8 wavelength. Let's see what EZNEC shows for a top hat vertical at the extreme against the inverted-vee. We can refine the model w
/archives//html/Topband/2021-04/msg00004.html (7,823 bytes)

184. Re: Topband: RFI tripping GFI breaker on 160m (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Wed, 4 Jan 2023 04:00:11 -1000
Are the offending GFCI circuit breakers Eaton brand? They are known to trip from HF transmissions and it is reported that Eaton will supply "HAM" circuit breakers at no cost. I can post Eaton contact
/archives//html/Topband/2023-01/msg00006.html (8,423 bytes)

185. Re: Topband: CQ WW 160 (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Mon, 30 Jan 2023 12:59:08 -1000
NH6V and I had another successful near-ocean ground plane portable operation on a cliff overlooking the Pacific Ocean. Local RFI was non-existent and all we had we a little bit of generator ignition
/archives//html/Topband/2023-01/msg00142.html (8,005 bytes)

186. Re: Topband: [PVRC] 2-element receiving arrays (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Mon, 3 Apr 2023 09:04:26 -1000
It seems that padding the element capacitance as needed for equal capacitance would help. Dave KH6AQ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
/archives//html/Topband/2023-04/msg00014.html (17,125 bytes)

187. Re: Topband: Using 4 - 6 elevated radials in lieu of 120 buried wires (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Fri, 5 Jan 2024 07:15:33 -1000
The paper *A Closer Look at Vertical Antennas With Elevated Ground Systems*, by Rudy, N6LF goes into great detail on the subject. Referring to Figure 13, which compares Ga (Average Gain) for radial h
/archives//html/Topband/2024-01/msg00037.html (10,571 bytes)

188. Re: Topband: HEBA antenna (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Fri, 19 Apr 2024 09:41:19 -1000
The HEBA appears to be the same animal as the CFA (Crossed Field Antenna) patented by Dr. Kabbary and M.C. Hately in the late 1980s. As the HEBA Model 103 Performance Analysis says, *" WWAS accomplis
/archives//html/Topband/2024-04/msg00039.html (10,613 bytes)

189. Re: Topband: HEBA antenna (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Fri, 19 Apr 2024 10:09:22 -1000
The HEBA/CFA for MF AM broadcasting (there was one planned for an LF BC station on the Isle of Man) has been commercially tested only for ground wave coverage as one would for a full size BC monopole
/archives//html/Topband/2024-04/msg00042.html (13,581 bytes)

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