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21. Re: [TenTec] manual for Mode B sat station (2510) (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 07 Apr 2011 11:33:30 -0500; If using a PTO from an Omni V or VI, that in those radios tunes from 5.5 to 5 for tuning up a band, 9 (IF filter) - (45 - 5) gets upright tuning for a 31 t0 31.5 MHZ tuning range. Mixed with 6 x 67.3; /archives//html/TenTec/2011-04/msg00122.html (10,414 bytes)
22. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 07 Apr 2011 11:50:05 -0500; And you jiggled the connections. No doubt C6 is highly suspect and cause of many display problems. It probably should be replaced before it goes completely bad to save on future failures. 73, Jerry,; /archives//html/TenTec/2011-04/msg00123.html (10,224 bytes)
23. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 07 Apr 2011 23:33:53 -0500; Its the only capacitor in the radio accompanying digital logic. Everything else is analog with slower edges or no edges at all. And most of the RF bypasses are not electrolytics. 73, Jerry, K0CQ == A; /archives//html/TenTec/2011-04/msg00130.html (8,081 bytes)
24. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 07 Apr 2011 23:39:25 -0500; All electrolytics need power at least every couple years. The electrolyte eats away at the insulation layer formed after they are assembled. So they go downhill continuously while not powered. That f; /archives//html/TenTec/2011-04/msg00131.html (10,084 bytes)
25. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 13:29:38 -0500; A quarter wave center fed wire has low radiation resistance and is very capacitive. Bad phase angle. You run that through a 600 ohm line about a quarter wave long, converts low R to high R and C to L; /archives//html/TenTec/2011-04/msg00136.html (10,662 bytes)
26. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 14:17:14 -0500; 600 ohm ladder line is classic, but in the case where you have a low impedance load like your short dipole or a 1/2 wave resonant dipole and a quarter wave of feed line it transforms those low impeda; /archives//html/TenTec/2011-04/msg00139.html (12,820 bytes)
27. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:01:35 -0500; 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. Correct - an EZNEC model of his; /archives//html/TenTec/2011-04/msg00151.html (10,959 bytes)
28. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:18:53 -0500; It will make a dandy multiband antenna if you can avoid having a quarter wave long feed line on 80 where the feed Z of the antenna is low and the feed end of the quarter wave line is very high. Like; /archives//html/TenTec/2011-04/msg00155.html (13,355 bytes)
29. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:20:27 -0500; But even on 160 it will beat a shielded dummy load or not trying to transmit at all. 73, Jerry, K0CQ That will make a super multi-band antenna in terms of loss...Just not below 80M. 73, Nate/N4YDU On; /archives//html/TenTec/2011-04/msg00156.html (10,125 bytes)
30. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:25:12 -0500; Perhaps it would be more useful to connect the ends through coils that would bring the antenna nearly to resonance on 160 and by their choke (neglecting distributed C to make into traps which may not; /archives//html/TenTec/2011-04/msg00157.html (10,497 bytes)
31. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:31:37 -0500; While reactive on all bands, that double extended zepp and 260 foot dipoles are much easier to feed at 160 because they present nicer impedances to the transmission line than the quarter wave center; /archives//html/TenTec/2011-04/msg00159.html (9,398 bytes)
32. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 16:54:14 -0500; Yah it gives consistent numbers but NEC2 and NEC4 are distinctly bad about working with close spacings. MININEC does better but its not perfect either. In the May/June 1989 issue of QEX Cebik compare; /archives//html/TenTec/2011-04/msg00164.html (10,913 bytes)
33. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 19:40:30 -0500; A resonant antenna takes current better and current radiates. But when the high current part of the antenna is in the loading coil it doesn't radiate nearly as well as if the loading coil is connecte; /archives//html/TenTec/2011-04/msg00167.html (11,500 bytes)
34. Re: [TenTec] Out securing a tan (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 08 Apr 2011 19:43:10 -0500; Probably the list administrator will lock his responses out and probably stop sending to him, so on his return he'll think the list died for lack of use. Because he'll be unsubscribed and it won't ac; /archives//html/TenTec/2011-04/msg00168.html (8,901 bytes)
35. Re: [TenTec] SLIGHTLY OT (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 09 Apr 2011 01:11:51 -0500; I haven't looked up Hawker's comments yet, but another scheme is to wire up a switch to disconnect the coil and extension wire for the higher bands. I think I've seen a commercial product for that. M; /archives//html/TenTec/2011-04/msg00172.html (10,876 bytes)
36. Re: [TenTec] Out securing a tan (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 09 Apr 2011 17:28:57 -0500; So far none that I have received have included an attachment. I have privately expressed my opinion to rclose@radiusnorth.com. If every member of the list did that for each one received his mailbox m; /archives//html/TenTec/2011-04/msg00179.html (8,523 bytes)
37. Re: [TenTec] Smaller 20M Rohmbic Question (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 10 Apr 2011 20:41:01 -0500; Chart in my 1994 edition ARRL antenna handbook says the optimum angle varies with the the wave angle. Between 52 degrees for zero wave angle to 60 degrees for 30 degree wave angle. That's the tilt an; /archives//html/TenTec/2011-04/msg00196.html (9,085 bytes)
38. Re: [TenTec] Smaller 20M Rhombic Question (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Mon, 11 Apr 2011 16:20:35 -0500; Agree on the NVIS which we used to consider normal 80 and 40 meter antennas for all but the richest hams. I don't think the extreme of 6' with its hazards is necessary, 20 feet works fine for me and; /archives//html/TenTec/2011-04/msg00202.html (11,148 bytes)
39. Re: [TenTec] Corsair question (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 16 Apr 2011 11:32:07 -0500; The swapped side bands on 17m is a product of the 9 MHz IF and 5 MHz VFO scheme used in Tentecs for nearly all recorded history. That comes from some of the earliest home brew rigs for SSB. And is wh; /archives//html/TenTec/2011-04/msg00220.html (10,707 bytes)
40. Re: [TenTec] Corsair question (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 16 Apr 2011 14:14:19 -0500; No Steve you are wrong. There is side band inversion. I was there. Look at it this way. say you have a carrier at 9.000 and a tone at 9.0015. Subtract 5.000 for 80 meters, the carrier comes out at 4.; /archives//html/TenTec/2011-04/msg00222.html (9,844 bytes)

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