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201. Re: [TenTec] Help me Decide ?? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 10 Aug 2008 12:45:21 -0600
Several VHF and microwave operators are using Flex radios for IFs and really liking them, as much CW as phone use. Look for KM0T's web page for an example. http://www.km0t.com/ and http://www.km0t.co
/archives//html/TenTec/2008-08/msg00133.html (10,634 bytes)

202. Re: [TenTec] ID Ten T Error (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 11 Aug 2008 17:01:12 -0600
I was successful in repairing my band switch knob. It has a central hub and an outer hand ring with a gap between. The inner hub split. I was able to bend so aluminum piece to fit the gap which I epo
/archives//html/TenTec/2008-08/msg00145.html (9,191 bytes)

203. Re: [TenTec] 229A Tuner question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 13 Aug 2008 10:31:21 -0600
Install a master switch for the whole hamshack. Then the wall wart works simply and when you shut down, you open the master switch taking power off all but the clock (or go to a battery clock, I comp
/archives//html/TenTec/2008-08/msg00162.html (9,758 bytes)

204. Re: [TenTec] 229A Tuner question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 13 Aug 2008 16:11:23 -0600
Since I use a better built supply than an Astron (a design of mine, all linear but at 30 amps load it runs 85% efficiency where the Astron might do 50% on a good day), I built up a special cable for
/archives//html/TenTec/2008-08/msg00176.html (11,143 bytes)

205. Re: [TenTec] cabling question re TT 253 tuner (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 15 Aug 2008 10:34:10 -0600
Cheap cables are sort of shielded with a spiral wrap, not braid. RS cables are the cheapest made of cables, nearly always spiral wrapped. That can let RF get into the control circuits. RG58A or RG58C
/archives//html/TenTec/2008-08/msg00224.html (9,726 bytes)

206. Re: [TenTec] OT: Ground Radials at Tower Base (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 15 Aug 2008 20:40:09 -0600
The grounding system for a vertical antenna is often deficient. That's easily seen when the antenna SWR is low, but there's no matching network. The perfectly grounded vertical should have a feed poi
/archives//html/TenTec/2008-08/msg00238.html (11,241 bytes)

207. Re: [TenTec] OT: Ground Radials at Tower Base (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 16 Aug 2008 17:33:19 -0600
Worked for me and my dad with a quarter wave vertical about 50 years ago. 5/8 wave is less picky about its ground plane. Or you could tilt the elements on the horizontal beam. 30 degree tilt costs ma
/archives//html/TenTec/2008-08/msg00256.html (10,323 bytes)

208. Re: [TenTec] OT: stealing Ground Radials at Tower Base (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 17 Aug 2008 13:24:23 -0600
Copper clad has low junk value once the buyer has been burned and found there's no way to separate the copper from the steel core. 73, Jerry, K0CQ
/archives//html/TenTec/2008-08/msg00272.html (8,130 bytes)

209. Re: [TenTec] TenTec Digest, Vol 68, Issue 22 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 18 Aug 2008 10:29:20 -0600
Even or especially in swampy ground, the earth is made of layers. Sometimes fertile and conductive, sometimes gravel, and sometimes clay. I own land with a clay layer down about 5'. That clay is wate
/archives//html/TenTec/2008-08/msg00297.html (10,119 bytes)

210. Re: [TenTec] TenTec Digest, Vol 68, Issue 22 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 19 Aug 2008 09:13:59 -0600
However many radials the ground rods at their outer end begins to make them very effective from the rod separation. 73, Jerry, K0CQ
/archives//html/TenTec/2008-08/msg00323.html (8,319 bytes)

211. Re: [TenTec] SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 04 Jul 2008 11:38:56 -0600
Last month I bought a copy of the 2006 ARRL Handbook through Abe Books for $8.32 before an Abe Books coupon. It included the software. They don't become instantly obsolete when the next edition comes
/archives//html/TenTec/2008-07/msg00058.html (9,718 bytes)

212. Re: [TenTec] SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 04 Jul 2008 12:25:31 -0600
Does not compute! 1 KW forward and 1/2 KW reflected says 1.5/.5 = 3:1 SWR, not 6:1. E.G. SWR = (forward + reflected) / (forward - reflected). 6:1 SWR is 71.45% reflected, 1.7145/0.2855.. What that ta
/archives//html/TenTec/2008-07/msg00062.html (11,341 bytes)

213. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 04 Jul 2008 12:37:09 -0600
And its all noise. The posted data is wrong except for the 1:1 line. All the rest is fiction. It is sometimes absorbed by the PA, sometimes reflected again towards the antenna. Not necessarily. Some
/archives//html/TenTec/2008-07/msg00064.html (10,872 bytes)

214. Re: [TenTec] SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 04 Jul 2008 12:56:28 -0600
But the data presented is just plain wrong except for the 1:1 case. All the rest is trash. Its the same quality data as CB antenna gain claims. 73, Jerry, K0CQ
/archives//html/TenTec/2008-07/msg00065.html (9,881 bytes)

215. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 06 Jul 2008 11:23:50 -0600
Tuner at the antenna feed point operates the feedline in a nearly matched condition (some tuners are happy with 1.5:1 SWR on their input) that minimizes the feed line losses. Tuner at the antenna fee
/archives//html/TenTec/2008-07/msg00081.html (10,202 bytes)

216. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 06 Jul 2008 20:51:56 -0600
NO! Coax does not radiate other than shield leakage, no matter what the SWR. And with decent single braid coax, that shield leakage is at least 40 dB down, its more with double braid. 73, Jerry, K0CQ
/archives//html/TenTec/2008-07/msg00096.html (8,752 bytes)

217. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 06 Jul 2008 22:14:07 -0600
Why not? The tuner can supply the needed series capacitive reactance to bring the feed impedance resistive. Isn't a resistive feed impedance (no matter what the magnitude) the definition of resonance
/archives//html/TenTec/2008-07/msg00100.html (11,931 bytes)

218. Re: [TenTec] OT: Selection of ferrite material (was SWR and Coax) (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:21:51 -0600
If you want your copy to work like the original, you need to use the same material as the original. So far as I know the effect of exceeding the Curie temperature is reversible. Its not permanently d
/archives//html/TenTec/2008-07/msg00123.html (9,721 bytes)

219. Re: [TenTec] OT SWR VS Power Loss (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:26:15 -0600
But the original premise was that coax radiated with high SWR, and didn't state the high SWR (and possibility of unbalance) was from being connected to an antenna. That high SWR coax could be between
/archives//html/TenTec/2008-07/msg00124.html (9,320 bytes)

220. Re: [TenTec] Omni 546C driver biasing (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 07 Jul 2008 10:36:19 -0600
With no RF drive and no forward bias the driver collector current should be ZERO. It takes more than 0.6 volt forward bias on the transistor base to cause collector current. If you have (check with V
/archives//html/TenTec/2008-07/msg00125.html (9,863 bytes)

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