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101. Re: Topband: 160 m inverted L (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Tue, 8 Nov 2016 18:16:36 -0800; Agree. I use three fixed serial caps with shorting relays to tune my 160m T, 8 elevated 125' radials, across the full band in 45KHz segments. The antenna is cut for 1820 and fed with a 50::25 TLT. Th; /archives//html/Topband/2016-11/msg00048.html (11,996 bytes)
102. Re: Topband: RBOG - wire fence (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 23 Nov 2016 13:10:50 -0800; My experience with a 600' regular Bev 6' over a 5 wire barb wire fence was not good. Modeling also showed it had little directivity. A solution in the modeling was to insulate all wires every 150', s; /archives//html/Topband/2016-11/msg00153.html (8,548 bytes)
103. Re: Topband: Inverted L Radials (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Thu, 1 Dec 2016 16:53:53 -0800; As you were disconnecting the radials the ground losses were increasing until it got to enough ohms and you had a good match at 50ohms. My 160 T matches 25 ohms 1.12:1 at 1812Khz and is fed with a 50; /archives//html/Topband/2016-12/msg00010.html (9,732 bytes)
104. Re: Topband: Terminating resistor (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 27 Jan 2017 09:18:03 -0800; Check out the Ohmite non-inductive 100w series http://www.ohmite.com/cat/acl_ap101.pdf Digikey stocks some values. Grant KZ1W Where can you obtain, at a reasonable price, a high wattage, non-inductiv; /archives//html/Topband/2017-01/msg00085.html (8,018 bytes)
105. Re: Topband: Radials question (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Tue, 13 Jun 2017 07:54:36 -0700; The larger the diameter of the antenna, the broader the bandwidth. So an aluminum self supporting vertical that starts with 3" diameter tubing (the HD DXE starts with 4") can have twice the intrinsic; /archives//html/Topband/2017-06/msg00034.html (9,474 bytes)
106. Re: Topband: Top loaded vertical help, (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Tue, 5 Sep 2017 20:08:49 -0700; With 75' of vertical you have 56% of a 1/4wl which is about the net vertical dimension of my T with elevated radials. My 2 top wires are about 36' long, ultimately they were cut to get a 25 ohm reson; /archives//html/Topband/2017-09/msg00013.html (10,197 bytes)
107. Topband: 4sq receive antenna side filters? (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 11 Sep 2017 07:25:55 -0700; I was asked by a DXpedition leader if it was practical to bandpass filter the input (antenna side) of the DX Engineering 4 sq's they plan to use (I have one). Given the few acres of the island and 5; /archives//html/Topband/2017-09/msg00027.html (7,238 bytes)
108. Re: Topband: 3C0L (FCP) (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Sun, 22 Oct 2017 15:54:47 -0700; Re the overload concern with active 4 sq receive antennas (although the IP3 is quite high for DX Eng and Hi-Z). For the upcoming Mellish DXpedition VK9MA, the team leader Rob N7QT asked if I could he; /archives//html/Topband/2017-10/msg00100.html (19,264 bytes)
109. Re: Topband: FT8. (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 25 Oct 2017 21:35:24 -0700; 10/25/2017 20:15 PM, JC wrote: there is no human intervention on FT8 after the first click. Not in my experience with FT8. Crowded bands, DX with poor ears, callers on the DX frequency all make it a; /archives//html/Topband/2017-10/msg00192.html (9,125 bytes)
110. Re: Topband: FT8 on 160m (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 27 Nov 2017 16:14:46 -0800; My WSTJ waterfall shows about 50Hz bandwidth for ft8 signals. In "band plan" theory the ft8 segment is 1840 to 1842.5. However, many rigs won't pass audio much below 300Hz and may not above 2.5KHz. I; /archives//html/Topband/2017-11/msg00143.html (9,387 bytes)
111. Re: Topband: FT-8 question (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Sat, 2 Dec 2017 20:13:50 -0800; Hi Jim, Well, yes on the 5 acres, but still suburban. But, I do notice that FT8 on the vertical 160 T often decodes as well as my DXE 4 sq receive which has directivity and thus less noise. Same comm; /archives//html/Topband/2017-12/msg00015.html (10,757 bytes)
112. Re: Topband: RBOG through radial field (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Tue, 9 Jan 2018 16:33:29 -0800; Beverages don't work well over continuous wire fencing, salt water, or other high conductivity platforms. If radial wires are perpendicular to the RBOG there is less affect. Modeling I've done shows; /archives//html/Topband/2018-01/msg00045.html (8,361 bytes)
113. Re: Topband: Supporting Ladder line (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 10 Jan 2018 08:23:34 -0800; The shield is always the antenna element. The coax provides the signal return path when the direction is set with the far end as the feed point of the antenna. Since you likely will have a preamp for; /archives//html/Topband/2018-01/msg00052.html (10,168 bytes)
114. Re: Topband: Kostas' point (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Thu, 18 Jan 2018 08:51:16 -0800; Good comments. Another perspective: If we consider DXCC a "people performance measurement system", then experience demonstrates some problems with those systems: 1. Some participants will invent clev; /archives//html/Topband/2018-01/msg00241.html (11,492 bytes)
115. Re: Topband: How to determine impedance (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 26 Jan 2018 07:59:57 -0800; Another line Z measurement technique is with a scope and reasonably fast risetime (few nsec) pulse generator. Terminate about a 20' length of line with a variable non-inductive pot or carbon comp res; /archives//html/Topband/2018-01/msg00264.html (11,174 bytes)
116. Re: Topband: Mixed elevated and ground located radials? (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 29 Jan 2018 09:02:13 -0800; Radials need to be elevated and insulated from ground/earth or on the ground and grounded. I tried a modeling exercise to see if a ground screen under elevated radials would improve efficiency but it; /archives//html/Topband/2018-01/msg00273.html (10,993 bytes)
117. Re: Topband: How to determine impedance (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 29 Jan 2018 09:13:15 -0800; What I used for data transmission line Z finding was a pulse gen, scope and variable resistor (non inductive). A fast risetime pulse reflects very clearly on the scope at the source. When the termina; /archives//html/Topband/2018-01/msg00274.html (11,971 bytes)
118. Re: Topband: Beverage transformer and testing (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 5 Feb 2018 20:23:43 -0800; I also use wire wrap wire. The Kynar insulation is designed to not cut thru against a sharp corner wire wrap post, no need to insulate ferrite. I use 26 or 30 gauge. Multi colors are fun and availabl; /archives//html/Topband/2018-02/msg00050.html (10,265 bytes)
119. Re: Topband: Fwd: Re: Belize-VK/ZL possibilities (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 7 Feb 2018 09:08:49 -0800; One issue is probably the orientation of the Belize beach vs path to VK/ZL. A vertical on the beach within .7 wavelengths of the tide line has pronounced gain seaward. That gain is at the expense of; /archives//html/Topband/2018-02/msg00061.html (9,920 bytes)
120. Re: Topband: 160M Balun (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 30 Mar 2018 08:52:26 -0700; I measured the Comtek bead balun on 160m and found there is low choking resistance. I use the K9YC design with good results, whether it will make any difference in your antenna system is something yo; /archives//html/Topband/2018-03/msg00162.html (7,990 bytes)

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