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221. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:40:40 -0600
Sometimes that vertical polarized radiation at a low radiation angle makes working DX possible that wouldn't be heard on the dipole. Sometimes that vertical polarized reception with its lack of direc
/archives//html/TenTec/2008-07/msg00126.html (11,082 bytes)

222. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:47:13 -0600
Even with the series reactance that takes out the residual reactance of the antenna. By using a reactance to achieve resonance, its usually not resistive everywhere. Not even a variable coil in the m
/archives//html/TenTec/2008-07/msg00127.html (14,046 bytes)

223. Re: [TenTec] OT: SWR & Coax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:50:12 -0600
So long as the shield is intact, it matters not whether the nodes match, there is current only on the inside of the shield and that can't radiate. You are forgetting that the coax is shielded and tha
/archives//html/TenTec/2008-07/msg00129.html (10,043 bytes)

224. Re: [TenTec] OT: SWR & Coax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:54:23 -0600
Sometimes a transmitter objects to the load presented this way and burns up essential parts like PA transistors. So sometimes some attention to SWR and its improvement are essential to the enjoyment
/archives//html/TenTec/2008-07/msg00130.html (10,733 bytes)

225. Re: [TenTec] OT: SWR & Coax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:58:17 -0600
No. The shield of the coax can have independent currents inside and outside. It takes a load like an antenna to cause currents on the outside. The shield prevents radiation from the inside current ev
/archives//html/TenTec/2008-07/msg00131.html (10,201 bytes)

226. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 11:07:06 -0600
I never said the resonance condition included changing the radiation resistance to 50 ohms. Only that that the phase angle of the load becomes zero, e.g. current and voltage are in phase at the feed
/archives//html/TenTec/2008-07/msg00132.html (11,927 bytes)

227. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 18:36:43 -0600
That limits a resonant antenna to those without any loading. That definition is too narrow because of that. So having a resistive feed Z by adding a loading coil to a short wire is not resonant. I di
/archives//html/TenTec/2008-07/msg00155.html (10,657 bytes)

228. Re: [TenTec] OT: SWR & Coax (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Jul 2008 09:39:32 -0600
Probably more a case for the matchbox of too much tuning capacitance demanding it run with a high loaded Q on the higher frequencies. It always has the differential caps across the coil plus the tuni
/archives//html/TenTec/2008-07/msg00177.html (10,481 bytes)

229. Re: [TenTec] New Rig.... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 10:47:14 -0600
Actually I didn't see much difference in substance on these pages. Corsair had 4 pole first filter, easily updated with the 8 pole model 220 filter. Corsair II had 5 dB more dynamic range probably be
/archives//html/TenTec/2008-07/msg00218.html (10,861 bytes)

230. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 10:58:34 -0600
A roller inductor depends on pressure of the roller on the coil turns for that connection. When the pressure is low, the contact gets dirty, and so gets scratchy while tuning receive or transmit thou
/archives//html/TenTec/2008-07/msg00219.html (11,914 bytes)

231. Re: [TenTec] 238 Tuner Dial cord (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 11:00:22 -0600
Sometimes there are small pulleys in the radio control section of a good hobby shop. 73, Jerry, K0CQ
/archives//html/TenTec/2008-07/msg00220.html (8,927 bytes)

232. Re: [TenTec] Bliss: Omni 546C working FB again (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 11:03:24 -0600
If the heatsink temperature stays within reason, the horizontal fins are adequate. They will cool immensely better if a muffin fan is hung our mounted to blow air at them. Then gravity is far less of
/archives//html/TenTec/2008-07/msg00221.html (8,514 bytes)

233. Re: [TenTec] OT Antenna Tuners plus one or 2 others (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 21:01:41 -0600
Palimar also had one and MFJ (MFJ-212 Matchmaker) still has one. Its handiest if it has a switch to insert and remove the tuner tuner. 73, Jerry, K0CQ
/archives//html/TenTec/2008-07/msg00227.html (9,373 bytes)

234. Re: [TenTec] New Rig.... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 10 Jul 2008 09:38:21 -0600
I read about that on the wiki while checking up on the differences. It only works on the Corsair, not on my Corsair II. And since I KNOW the relaxation oscillator faithfully follows my keying and it
/archives//html/TenTec/2008-07/msg00233.html (9,312 bytes)

235. Re: [TenTec] WTB Rocker Switch (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 11 Jul 2008 20:17:51 -0600
Mouser, www.mouser.com, has Carling rocker switches. But none with a part number that short. You might have to search by mounting dimensions. All in the catalog snap into place. 73, Jerry, K0CQ
/archives//html/TenTec/2008-07/msg00264.html (7,578 bytes)

236. Re: [TenTec] Orion I RIT/XIT problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 11 Jul 2008 20:32:09 -0600
Used to be, Tentec used insulation displacement connectors for interconnecting ribbon cables. Some of those are more appropriate for 12 volt power than for low logic levels. E.g. tin connector on bar
/archives//html/TenTec/2008-07/msg00265.html (9,916 bytes)

237. Re: [TenTec] Need more help on RIT/XIT (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 13 Jul 2008 07:48:06 -0600
Next thing to do is to apply DeoxIT to the mating pins. And then to replace the ribbon cable assembly. It should be a stock item at TT, Mouser, and DigiKey. Ribbon cables often use insulation displac
/archives//html/TenTec/2008-07/msg00283.html (10,111 bytes)

238. Re: [TenTec] Corsair II with separate receiver (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 18 Jul 2008 10:45:52 -0600
It would be great to use the QSK output to run the relay, then a spare relay contact to enable the Corsair II output, then the relay will be switching cold. But if you don't need QSK there is a T/R r
/archives//html/TenTec/2008-07/msg00313.html (9,552 bytes)

239. Re: [TenTec] Corsair II and Icom as 2nd rx (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 18 Jul 2008 12:35:45 -0600
Close, but works differently. That switch unhooks the internal receiver from the TR diodes so the receiver can use a different antenna. Like listening on 160 with a Beverage and transmitting with a d
/archives//html/TenTec/2008-07/msg00315.html (8,753 bytes)

240. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 19 Jul 2008 10:36:53 -0600
While his understanding of impedance matching and filtering networks is a little off the wall, the concept of a balanced tuner with the balun at the 50 ohm side is a good one that keeps from abusing
/archives//html/TenTec/2008-07/msg00326.html (10,318 bytes)

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