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221. Re: [TenTec] Hercules II drive requirement (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 14 Nov 2009 17:15:43 -0800
I've only been using the Herc II during contests when I'm not at home, so haven't done "real" power measurements of drive level or output power for quite a while. Your point is taken, and when I have
/archives//html/TenTec/2009-11/msg00123.html (9,624 bytes)

222. Re: [TenTec] Distortion SSB Omni VII (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 21 Nov 2009 10:24:41 -0800
Grounding is probably barking up the wrong tree unless something is really wrong with your antenna system. The most likely cause is the live mic over-driving the electronics that it is connected to.
/archives//html/TenTec/2009-11/msg00210.html (8,308 bytes)

223. [TenTec] Yamaha CM500 Headset (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 23 Nov 2009 10:02:14 -0800
YES, it is an ELECTRET CONDENSER mic. The only doc I can find from Yamaha says that it's a dynamic. The package includes a battery holder and adapter to provide power for the condenser just in case t
/archives//html/TenTec/2009-11/msg00245.html (11,760 bytes)

224. Re: [TenTec] humm (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 25 Nov 2009 15:41:47 -0800
Forget about grounding and rewiring things. I suspect that your problem is nothing more than simple magnetic coupling of 60 Hz into the mic. When you set the rolloff to 200 Hz, you knock it down a lo
/archives//html/TenTec/2009-11/msg00288.html (9,377 bytes)

225. Re: [TenTec] humm (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 26 Nov 2009 07:53:41 -0800
With lightning, it is INDUCTANCE, NOT RESISTANCE. The energy in lightning is centered around the AM broadcast band and extends well into the HF spectrum. Above about 20kHz, the inductive reactance o
/archives//html/TenTec/2009-11/msg00307.html (9,527 bytes)

226. Re: [TenTec] humm (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 26 Nov 2009 12:30:43 -0800
The chassis of anything connected to the power line should be bonded internally to the green wire of the AC line cord, and I would bet that the Ten Tec p/s is built that way. Since this gear is used
/archives//html/TenTec/2009-11/msg00312.html (10,976 bytes)

227. Re: [TenTec] humm (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 29 Nov 2009 17:07:40 -0800
YES! Jim _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2009-11/msg00344.html (8,255 bytes)

228. Re: [TenTec] Centurion 422 Amp HV - 2800 V S/B 3100??? (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 03 Dec 2009 16:00:40 -0800
Yes. I don't know about the Centurion, but the Titan 425 also includes a pot to calibrate the HV. Another point. Reduced HV B+ is also a symptom of a bad filter cap in the power supply. If you start
/archives//html/TenTec/2009-12/msg00017.html (8,818 bytes)

229. Re: [TenTec] Centurion 422 Amp HV - 2800 V S/B 3100??? (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 03 Dec 2009 19:17:37 -0800
Until you have reports of hum or can't make power output, I'd consider it a "non-problem." 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http:
/archives//html/TenTec/2009-12/msg00019.html (8,515 bytes)

230. Re: [TenTec] Tentec XCVR Keying Loop and Amp Supply Amp Question? (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 04 Dec 2009 11:14:32 -0800
I've had sucess keying rigs and amps that were difficult to key by pushing the external keying transistor further into saturation. For example, when keying the rig from a computer on the DTR line, yo
/archives//html/TenTec/2009-12/msg00026.html (8,048 bytes)

231. Re: [TenTec] Centurion (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 19 Dec 2009 21:37:36 -0800
They are running on low B+, so look at the schematic to figure out what that is. If they are like those in my Titans, they are a standard bayonet base. I've replaced mine with bulbs rated for long ho
/archives//html/TenTec/2009-12/msg00166.html (8,825 bytes)

232. Re: [TenTec] Transverter Question (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 21 Dec 2009 10:43:43 -0800
When I was still living in Chicago, I bought a used Icom 746 from a friend to use on 6M and 2M. I already owned an Omni V.9. It's a very nice rig, and works quite well on 6 and 2. It, and most garden
/archives//html/TenTec/2009-12/msg00179.html (9,296 bytes)

233. Re: [TenTec] Optimizing 238 settings? (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 26 Dec 2009 12:33:50 -0800
Hi Barry, I own five of these tuners to use with my wire antennas. For most antennas and most operating frequencies, there is, as Joel notes, a single setting that provides a match, and it tends to w
/archives//html/TenTec/2009-12/msg00207.html (8,868 bytes)

234. Re: [TenTec] T-New Work settings (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 28 Dec 2009 13:59:21 -0800
That's all very nice, BUT -- the Ten Tec 229 and 238 tuners are L- Network tuners, NOT T-Network tuners. Rather different animals, and the L is a generally better behaved one. 73, Jim K9YC __________
/archives//html/TenTec/2009-12/msg00233.html (7,247 bytes)

235. Re: [TenTec] T-New Work settings (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 29 Dec 2009 11:09:24 -0800
Thanks Ken. You're right, of course. Your post made me return to the manual and open up the box to look at the second inductor, which is 5 close-spaced turns of THHN around the (non-conductive) bands
/archives//html/TenTec/2009-12/msg00240.html (8,842 bytes)

236. Re: [TenTec] T-New Work settings (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 29 Dec 2009 13:30:31 -0800
Nice work, Ron. Thanks for posting it. FWIW -- the cap that I most often fry is the one by itself at the back of the bandswitch. 73, Jim K9YC _______________________________________________ TenTec ma
/archives//html/TenTec/2009-12/msg00243.html (8,228 bytes)

237. Re: [TenTec] 238 caps (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 29 Dec 2009 16:03:15 -0800
If I'm not mistaken, the primary failure mode is heating due to excessive dissipation (i.e., equivalent series resistance), not voltage breakdown. 73, Jim K9YC _______________________________________
/archives//html/TenTec/2009-12/msg00248.html (7,092 bytes)

238. Re: [TenTec] herc 444 (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 10 Jan 2010 09:56:39 -0800
1) VERY unlikely. 2) VERY EXPENSIVE. 3) Ten Tec rigs of that vintage are fairly easy to work on. All the circuitry is no boards that you can take out and work on, the circuitry is all discrete transi
/archives//html/TenTec/2010-01/msg00081.html (7,784 bytes)

239. Re: [TenTec] Help with Centurion Amp (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 10 Jan 2010 10:40:53 -0800
My three Titan 425s work on 17M in the 20M position of the bandswitch (and on 12M in the 15M position). In both cases it puts out full power, and tuning is at the low extremes of the two capacitors.
/archives//html/TenTec/2010-01/msg00085.html (7,244 bytes)

240. Re: [TenTec] [(TenTec) help with Centurion Amp] (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 10 Jan 2010 20:54:06 -0800
Yes. Also, when first experimenting with them, I tried the higher bandswitch setting for both. As I recall, I could make 17M work on either the 20M or 15M setting. Perhaps the same on 12M. Don't reca
/archives//html/TenTec/2010-01/msg00103.html (7,717 bytes)

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