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221. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 06 Apr 2011 22:30:59 +0100; The path you need to check is: Pin 17 of U2 on the 81247 Display Driver board R14 on the 81247 Display Driver board Links between the 81247 Display Driver board and the 81248 Display Board 73, Steve; /archives//html/TenTec/2011-04/msg00107.html (8,508 bytes)
222. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 06 Apr 2011 22:38:04 +0100; Barry, That is odd. I don't think it can be the 68705 because that doesn't operate down at the segment level. On the other hand the 10MHz and 1MHz positions are fed by completely separate driver chip; /archives//html/TenTec/2011-04/msg00108.html (9,942 bytes)
223. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:35:34 +0100; Correct - an EZNEC model of his antenna puts the feedpoint impedance at around 11-j930 Ohms You run that through a 600 ohm line about a quarter wave long, converts low R to high R and C to L. No, tha; /archives//html/TenTec/2011-04/msg00140.html (10,298 bytes)
224. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:42:47 +0100; By the way, TLW predicts nearly 3dB loss in 110ft of 600 Ohm line on 160m with that length dipole; the loss would be even greater with commercial ladderline. My first move would be to lengthen the di; /archives//html/TenTec/2011-04/msg00142.html (8,884 bytes)
225. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:52:36 +0100; Irrespective of the matching problem, such a short dipole is going to give you very significant losses in the feedline. If you could lengthen the dipole to 200ft, TLW predicts the open-wire loss woul; /archives//html/TenTec/2011-04/msg00145.html (9,018 bytes)
226. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 21:33:31 +0100; Mike, Yes, it's a very popular "Ham Myth" - not helped by various articles in QST. TLW is the software supplied by ARRL with the Antenna Book. It calculates the losses and impedance transformations f; /archives//html/TenTec/2011-04/msg00148.html (10,425 bytes)
227. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 21:46:26 +0100; Art, If you mean extending the ends off at 90 degrees to the main dipole at the 25ft/30ft level, that's fine. Just think of it as adding end capacity loading to an electrically short dipole. The impo; /archives//html/TenTec/2011-04/msg00149.html (10,467 bytes)
228. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:11:51 +0100; Mike, You're putting words in my mouth - I've not said anything about whether an antenna is "half decent" or not. What I can tell you for sure is that a 132ft dipole at 50ft above average ground will; /archives//html/TenTec/2011-04/msg00152.html (10,361 bytes)
229. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:27:37 +0100; Careful about the EZNEC model for impedance. None of the NEC models do coupling to the earth. Their earth model is only used for reflections for the elevation pattern. No - it also uses the earth mod; /archives//html/TenTec/2011-04/msg00158.html (10,046 bytes)
230. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:39:00 +0100; It not only wont read that high - it's probably calibrated for a 50 Ohm system not a 400 Ohm system ;) 73, Steve G3TXQ 320 X 1, my golden eagle CB watt meter doesn't even read that high! :-) Walt K8C; /archives//html/TenTec/2011-04/msg00162.html (10,710 bytes)
231. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:51:39 +0100; Art, That's probably wise, if you're happy with its performance on the other bands! I, too, am "blessed" with a relatively small garden. When I got serious about 160m operation I went for a 40ft top-; /archives//html/TenTec/2011-04/msg00163.html (9,724 bytes)
232. Re: [TenTec] Smaller 20M Rohmbic Question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 11 Apr 2011 12:03:09 +0100; It models as having a gain of 8dBd and a half-power beamwidth of about +/- 30 degrees. Hope you can erect it in the direction you need ;) 73, Steve G3TXQ; /archives//html/TenTec/2011-04/msg00197.html (8,002 bytes)
233. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 19:00:21 +0100; Jerry, I never understood that piece of Ham folklore, or should it be "Ham Myth" :) In a mixing arrangement comprising a 9MHz IF and a 5-5.5MHz LO, designed to cover 20m/75m, there is *NO* sideband i; /archives//html/TenTec/2011-04/msg00221.html (9,698 bytes)
234. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 20:35:33 +0100; Jerry, Sorry - you are quite wrong on this :) If you have a carrier at 9.000 and a tone at 9.0015, subtract 5.000 for 80m and you get carrier at 4.000 and a tone at 4.0015. *USB* both at the IF and a; /archives//html/TenTec/2011-04/msg00223.html (10,911 bytes)
235. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 20:57:17 +0100; Jerry, It's a mistake to confuse the simple "9MHz IF with 5-5.5MHz LO" mixing scheme with the one used in the Corsair. In the Corsair we have: RF = LO - IF for all bands 160m thru 30m, and RF = LO +; /archives//html/TenTec/2011-04/msg00224.html (8,756 bytes)
236. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 14:30:55 +0100; Barry, That sounds right. U2A is included as an audio phase inverter - that allows *full-wave* rectification of the audio using the D6/D7 + D8/D9 diode pairs. Full-wave rectification provides a faste; /archives//html/TenTec/2011-04/msg00299.html (10,779 bytes)
237. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 14:36:21 +0100; By the way, my schematic misses out the positive rail which the emitter of Q9 and the R49/R47 junction connect to! For fault finding purposes, that part of my schematic is annotated with three typica; /archives//html/TenTec/2011-04/msg00300.html (10,086 bytes)
238. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 16:51:22 +0100; I agree - and that's why I've tried to replicate it on my OmniVI: http://www.karinya.net/g3txq/hang_agc/ 73, Steve G3TXQ On 23/04/2011 16:43, Don Rasmussen wrote: The AGC is the "magic" of Corsair II; /archives//html/TenTec/2011-04/msg00303.html (9,269 bytes)
239. Re: [TenTec] Corsair II VFO level? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 21 Mar 2011 14:58:48 +0000; I measure 1.3v p/p from the PTO at the input to the xtal mixer board on my Corsair II. By the way, I replaced the PTO on one of my two Corsair IIs with the N4YG DDS board. That provides two VFO funct; /archives//html/TenTec/2011-03/msg00207.html (9,230 bytes)
240. Re: [TenTec] Corsair II VFO level? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 21 Mar 2011 15:25:03 +0000; I bought mine from him and fitted it last month. I made some simple modifications to mine which improved spurii levels significantly. I had multiple eMail exchanges with Joe telling him what I had do; /archives//html/TenTec/2011-03/msg00209.html (9,911 bytes)

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