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181. Re: [TenTec] Suggestions please (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 09 Jan 2011 16:53:25 -0600
And the reason I've been using homebrewed open 600-ohm line -- using the 276 log formula :-) The log formula has a tiny error at 600 ohms, but not enough to be concerned about. The inv cosh formula a
/archives//html/TenTec/2011-01/msg00249.html (13,167 bytes)

182. Re: [TenTec] New and Improved Terminology (NVIS origins) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 09 Jan 2011 20:06:07 -0600
Oh... come now... not the biggest....? ! ? SOMETHING else must take the cake... ;-) Prekinking the tubing would be more nonsensical. Jim, it took me several years to figure out something that should
/archives//html/TenTec/2011-01/msg00254.html (16,309 bytes)

183. Re: [TenTec] New and Improved Terminology (NVIS origins) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 19:04:16 -0600
I think some changing of the mechanical resonant frequency, but mostly adding damping so the element doesn't ring. 73, Jerry, K0CQ -Stuart Rohre K5KVH
/archives//html/TenTec/2011-01/msg00268.html (11,253 bytes)

184. Re: [TenTec] ballun suggestions (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 19:23:57 -0600
The inverted V operation may be improved by moving the lower ends higher and further from the operating position. A ground strap between the tuner and the radio might help. Quarter wave of wire at 15
/archives//html/TenTec/2011-01/msg00269.html (10,392 bytes)

185. Re: [TenTec] New and Improved Terminology (NVIS origins) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 19:42:46 -0600
The wire elements in the Hex Beam and Spideream surely vibrate in the wind, on power and phone wires its called Aeolian vibrations, most prominent at light winds. http://www.uh.edu/engines/epi1653.ht
/archives//html/TenTec/2011-01/msg00270.html (12,450 bytes)

186. Re: [TenTec] Aeolian Vibration (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 23:19:42 -0600
Power and open phone wires (not used much anymore) sound the loudest with just a 2 or 3 mph wind. Any stronger wind and the wind noise hides the sound on the ground. Those wires are generally strung
/archives//html/TenTec/2011-01/msg00273.html (12,690 bytes)

187. Re: [TenTec] What about antenna wire? What to buy? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 11 Jan 2011 21:43:21 -0600
To meet the National Electrical Code you need #12 stranded and that's quite durable. For stealth you want something smaller than #24 enameled. Called magnet wire or you unwind a high voltage transfor
/archives//html/TenTec/2011-01/msg00283.html (9,307 bytes)

188. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 12:26:29 -0600
I used link coupled tuners on my centerfed long wire from 160 through 2m. Sometimes series tuned secondary, sometimes parallel tuned, and on the higher bands parallel tuned and feed line tapped on th
/archives//html/TenTec/2011-01/msg00290.html (8,892 bytes)

189. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 13:20:25 -0600
I used 300 ohm twinlead, 400 ohm 1' spaced 18 gauge copperweld, and Ma Bell shielded (bronze strap) direct burial twin wire. The antenna is very reactive on all bands so it takes a good tuner and tha
/archives//html/TenTec/2011-01/msg00295.html (9,753 bytes)

190. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 14:57:41 -0600
The whole set, some single band, some multiple band with the bands witching and series parallel switching accomplished by moving clip leads along the coil made of 1/4" copper strap wound on edge. 73,
/archives//html/TenTec/2011-01/msg00300.html (8,686 bytes)

191. Re: [TenTec] Orion Display and Power Distribution Board (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 17:30:21 -0600
NTE is a replacement line, typically more expensive than original 2N parts. The BD246 part is not a typical US part, though its possible, but that's more a European part number, unlikely to be stocke
/archives//html/TenTec/2011-01/msg00307.html (10,064 bytes)

192. Re: [TenTec] What about antenna wire? What to buy? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 18:06:24 -0600
Farm stores and hardware stores in farm territories often carry toroidal shaped ceramic insulators with a groove around the outside that make decent antenna insulators. Sometimes they are only sold b
/archives//html/TenTec/2011-01/msg00309.html (12,508 bytes)

193. Re: [TenTec] What about antenna wire? What to buy? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 19:55:33 -0600
$440 for a G4RV is a royal rip off. There's maybe $25 in materials. 73, Jerry, K0CQ Tom, Many wires will work at 100 watts. For stealth and durability, stranded no. 22 light blue insulated hook up wi
/archives//html/TenTec/2011-01/msg00311.html (12,683 bytes)

194. Re: [TenTec] What about antenna wire? What to buy? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 12 Jan 2011 20:34:11 -0600
That's more tolerable. 73, Jerry, K0CQ Tom, Many wires will work at 100 watts. For stealth and durability, stranded no. 22 light blue insulated hook up wire will work if your feedline is supported to
/archives//html/TenTec/2011-01/msg00313.html (12,522 bytes)

195. Re: [TenTec] Orion Display and Power Distribution Board (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 13 Jan 2011 11:14:19 -0600
If the BD246 wasn't faulty, just slowed by the length of the leads, how did the radio ever work? Might the aging of an electrolytic have contributed to the poor regulation? 73, Jerry, K0CQ On 1/13/20
/archives//html/TenTec/2011-01/msg00317.html (9,183 bytes)

196. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 13 Jan 2011 15:41:31 -0600
And 6m and 2m quite well. And probably 160 with a good tuner. 73, Jerry, K0CQ On 1/13/2011 3:13 PM, ROD wrote: If you dont work 160 then a good ant. is the double extended zepp 83 ft on each side for
/archives//html/TenTec/2011-01/msg00322.html (9,164 bytes)

197. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 13 Jan 2011 18:11:13 -0600
Tentec should be the one most capable of making a new board design. They SHOULD have the code for the old control program, if its the processor that is most obsolete. If they don't have the code, its
/archives//html/TenTec/2011-01/msg00325.html (9,867 bytes)

198. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 13 Jan 2011 21:16:32 -0600
If one of the thousand and one PIC chips wouldn't do, there are perhaps 100 makers of microcontroller chips each with hundreds of products with a wide variation on capabilities. I suspect Tentec can'
/archives//html/TenTec/2011-01/msg00334.html (10,935 bytes)

199. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 10:27:46 -0600
I do have a small Johnson Matchbox, but it doesn't have the versatility needed for my wire antennas, so I've built my own tuners. My big tuner (built long before I owned an E. F. Johnson tuner) is ov
/archives//html/TenTec/2011-01/msg00342.html (13,401 bytes)

200. Re: [TenTec] Obsolescence was: Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 10:40:52 -0600
True... but those boat anchor rigs were designed to be repairable, under the assumption that you could still get the parts/components to repair them. Or, at least find a viable substitute. But, over
/archives//html/TenTec/2011-01/msg00343.html (15,536 bytes)

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