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101. Re: [TenTec] Wet ladderline (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 15 Aug 2013 14:10:36 +0100; I wont name the "expert" directly, but a thorough search of the QRZ.COM Antenna forum would reveal all. However, you will only now find *quotes* from his postings - the postings themselves have all b; /archives//html/TenTec/2013-08/msg00226.html (8,609 bytes)
102. Re: [TenTec] Herc 2 LP Cap? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 27 Aug 2013 20:58:56 +0100; At the 550W level the capacitor will have about 166v rms across it when looking into a matched load - on 20m that's 1.46A rms through the capacitor and 234v peak across it. Worst-case, if the load SW; /archives//html/TenTec/2013-08/msg00301.html (9,283 bytes)
103. Re: [TenTec] Herc 2 LP Cap? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 27 Aug 2013 22:32:43 +0100; C42 is a shunt component on the *input* side of the LPF - the voltage across it is the full output voltage of the four combined PA modules, fundamental plus harmonics. At 14MHz it's reactance is 114; /archives//html/TenTec/2013-08/msg00314.html (9,926 bytes)
104. [TenTec] 961 Power supply - internal photos needed (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 06 Jul 2013 15:34:49 +0100; I have most of the pieces to replicate a 961 Power Supply to go with my spare CorsairII, but I don't have the 81402 Pass Transistor board. The components for the board are easy to source, but I just; /archives//html/TenTec/2013-07/msg00111.html (8,720 bytes)
105. Re: [TenTec] Tuner (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 08 Jul 2013 21:21:04 +0100; For the record, here's a Smith Chart that shows in the coloured areas those impedances which need the so-called "HighZ" L-match configuration: http://www.karinya.net/g3txq/temp/hiz_loz.png In the Gre; /archives//html/TenTec/2013-07/msg00124.html (9,397 bytes)
106. Re: [TenTec] Tuner (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 08 Jul 2013 22:56:01 +0100; At 3.5MHz, the SWR(50) of an 80m dipole cut for resonance at 3.8MHz could easily be 12:1 or higher. Depending on the length of the coax, that can present impedances at the tuner that will be well out; /archives//html/TenTec/2013-07/msg00130.html (9,629 bytes)
107. Re: [TenTec] Tuner (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 08 Jul 2013 23:21:30 +0100; The problem is most acute when the length of the coax transforms the off-resonance feedpoint impedance to a low resistive value - for example around 6 Ohms for 45ft of Rg-8X; the tuner then doesn't h; /archives//html/TenTec/2013-07/msg00132.html (10,339 bytes)
108. Re: [TenTec] Tuner (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 09 Jul 2013 11:17:58 +0100; Let's not perpetuate the myth that the G5RV was designed as a single band 20m antenna! "Since only an average size back garden was available it was not deemed worthwhile to construct a beam for the D; /archives//html/TenTec/2013-07/msg00151.html (10,290 bytes)
109. Re: [TenTec] OCF antennas evolution (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Jul 2013 21:52:18 +0100; Because: a) It's a voltage balun and therefore will drive *unequal* currents into anything except a perfectly balanced load. A voltage balun has *zero* common-mode impedance. b) Its a 4:1 balun; so,; /archives//html/TenTec/2013-07/msg00265.html (10,439 bytes)
110. Re: [TenTec] OCF antennas evolution (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 13 Jul 2013 17:06:49 +0100; I would expect the current "hot spots" to be every 22ft or so on 15m. You should slide the current probe at least 11ft to be sure to encompass one. Perhaps that's what you meant? Steve G3TXQ On 12/07; /archives//html/TenTec/2013-07/msg00306.html (11,101 bytes)
111. Re: [TenTec] TT 238C will not tune (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 29 Jul 2013 10:06:25 +0100; A number of points: 1) An "ugly" balun is a poor choice for use at the output of a wide-band tuner. It has high choking impedance over only a very narrow band of frequencies, and outside that narrow; /archives//html/TenTec/2013-07/msg00435.html (11,851 bytes)
112. Re: [TenTec] OT: Openwire/Window Line and Bad Wx (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 29 Jul 2013 19:22:21 +0100; ARRL literature has consistently underestimated the losses of ladderline. For example, the matched losses quoted in the ARRL Antenna Book - at least up to the 21st edition - are about one half the fi; /archives//html/TenTec/2013-07/msg00450.html (12,004 bytes)
113. Re: [TenTec] OT: Openwire/Window Line and Bad Wx (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 31 Jul 2013 22:07:08 +0100; I found time today to do some experimenting on this issue of how window-line losses increase when the line gets wet. I took 60ft of 300 Ohm window (JSC 20AWG conductors) and suspended it about 4ft ab; /archives//html/TenTec/2013-07/msg00490.html (10,894 bytes)
114. Re: [TenTec] 9420 PS Problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 09 Jun 2013 15:35:20 +0100; Mine failed 9 years ago and I fitted a Ł15 replacement from RS-Components here in UK. Not much help to you as the part is no longer available :( It's worth noting that transformer is powered 24x7x365; /archives//html/TenTec/2013-06/msg00051.html (8,343 bytes)
115. Re: [TenTec] Antenna measurements (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 21 Apr 2013 22:14:45 +0100; That's correct - it's charge acceleration and deceleration which causes radiation. If you take a long wire and terminate it in its characteristic impedance it will radiate - there doesn't need to be; /archives//html/TenTec/2013-04/msg00215.html (10,826 bytes)
116. Re: [TenTec] Built in SWR meter bannans (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 22 Apr 2013 15:50:01 +0100; What Rick reported is perfectly sound! If the currents in each of the bifilar pair are balanced - that is they are equal magnitude and opposite phase - there will be no net flux in the core. If they; /archives//html/TenTec/2013-04/msg00231.html (12,658 bytes)
117. Re: [TenTec] Antenna measurements (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 22 Apr 2013 22:26:22 +0100; Stuart, Can you give us the exact Kraus quote, or a reference, to see the context in which he made it? "Although a charge moving with uniform velocity along a straight conductor does not radiate, a c; /archives//html/TenTec/2013-04/msg00240.html (10,580 bytes)
118. Re: [TenTec] Antenna measurements (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 23 Apr 2013 21:24:04 +0100; Stuart, As yet, I've been unable to find anything remotely like that in my 3rd edition; but I'll carry on looking :) A simple "test question" for me would be: "does an infinitely long straight wire (; /archives//html/TenTec/2013-04/msg00250.html (11,195 bytes)
119. Re: [TenTec] Antenna measurements (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Tue, 23 Apr 2013 22:07:01 +0100; This is the concise statement I have in my (very) old course notebook: Static charge -> electric field Moving charge (non-accelerating) -> magnetic field Accelerating or decelerating charge -> EM rad; /archives//html/TenTec/2013-04/msg00255.html (11,721 bytes)
120. Re: [TenTec] Built in SWR meter bannans (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 24 Apr 2013 09:18:55 +0100; Rick, It's not difficult - just a bit tedious - to work this stuff out. Let me walk you through the example of a feedpoint 1:1 balun for a 40m beam: 1) Assume the power level is 1kW and the beam feed; /archives//html/TenTec/2013-04/msg00281.html (13,290 bytes)

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