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241. [Amps] TS-440S Update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 06:53:35 -0700; ? I spoke with a Cal Berkeley graduate about making solid-state output radios as clean as the 830. He said it would be easy: Simply add a low-ohm chip-R in the emitter or source (FET) to create RF-N; /archives//html/Amps/2002-04/msg00358.html (8,538 bytes)
242. [Amps] TS-440S Update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 07:11:37 -0700; ALC will always be a problem, but it can be ameliorated with RF-NFB and less than "petal to the metal" mic. gain setting. ? The FCC limit on allowable IMD in the Amateur Radio bands is indeterminate; /archives//html/Amps/2002-04/msg00360.html (10,144 bytes)
243. [Amps] TS-440S Update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 07:31:14 -0700; ? Especially in broadband RF applications, transformers have frequency dependant phase-shift. What is negative feedback at 2MHz can be positive feedback above 20MHz -- just what is needed for oscill; /archives//html/Amps/2002-04/msg00361.html (9,444 bytes)
244. [Amps] Odd SB-220 behavior -- help needed (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 16:36:15 -0700; If the driver is solid-state, the SB-220's tuned inputs need to be redone with a Q of 2 - 3. This subject is addressed in the circuit improvements for the SB-220 article on my Web site. - R. L. Measu; /archives//html/Amps/2002-04/msg00371.html (7,369 bytes)
245. [Amps] RF Ground for 2nd Floor (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 16:42:38 -0700; ? With my balanced antenna, I can disconnect the station ground and it makes no difference on receive or transmit. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00372.html (8,914 bytes)
246. [Amps] TS-440S Update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 16:47:57 -0700; ? The power output is still set for 100W. I increased the V to gain more headroom and less distortion cheers, Guillermo. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures.; /archives//html/Amps/2002-04/msg00373.html (8,535 bytes)
247. [Amps] TS-440S Update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 23:10:17 -0700; Or Correct, Guillermo. Distortion happens when the collector V or drain V gets too low (probably around 1V) to attract electrons from the emitter/Source. Starting at 16V gives more headroom above th; /archives//html/Amps/2002-04/msg00379.html (8,291 bytes)
248. [Amps] RF Ground for 2nd Floor (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Apr 2002 23:10:37 -0700; ? At 1.8 - 30 MHz, in garden-variety soil, RF penetrates only a few inches. Thus, an 8' gnd rod has substantially less RF-R if it is buried horizontally, just under the surface than if it driven in; /archives//html/Amps/2002-04/msg00380.html (8,488 bytes)
249. [Amps] RF ground (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 16 Apr 2002 18:26:13 -0700; ? I use a Hertz antenna (end-fed multi half-wave; high feed-Z). Equal currents flow into the antenna and the antenna tuner ground. The lead to the ground system is 5' of two-inch wide copper strap (; /archives//html/Amps/2002-04/msg00393.html (10,114 bytes)
250. [Amps] RF ground (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 16 Apr 2002 23:24:03 -0700; ? 18kV is a semi-reasonable assumption,Gary . However, an 18kVpulse of c.100kHz RF on the tuner case should not be a problem since the antenna tuner is isolated from the amplifier with a 30uH, air-c; /archives//html/Amps/2002-04/msg00396.html (8,022 bytes)
251. [Amps] RF ground (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 17 Apr 2002 10:09:07 -0700; tuner; /archives//html/Amps/2002-04/msg00404.html (7,805 bytes)
252. [Amps] Taylor tubes (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 18 Apr 2002 03:33:36 -0700; ? Yes, yes. All's fair in love, war, and Chinese business practices. As I understand it, some political prisoners (a.k.a., the minority political party) are used to build 'em. This is probably bette; /archives//html/Amps/2002-04/msg00416.html (6,753 bytes)
253. [Amps] Taylor tubes (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 18 Apr 2002 13:25:39 -0700; ? This is what a U. S. tube dealer told me. He said that one of the several tube plants is better than the others, but you can't tell from the markings which plant made the tube. ? Agreed ? I have h; /archives//html/Amps/2002-04/msg00442.html (7,325 bytes)
254. [Amps] TL-922 (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 18 Apr 2002 19:23:59 -0700; Shigeo: The circuit in Figure 7 on my Web site will switch fast enough for the 1st dot. cheers - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00459.html (6,771 bytes)
255. [Amps] Forged e-mail (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 20 Apr 2002 08:33:57 -0700; A mole who forges my name and e-mail adr has been busy. If you receive something from me that sounds funny, compare the "long headers" with the genuine article. thanks - R. L. Measures, a.k.a. Rich..; /archives//html/Amps/2002-04/msg00496.html (6,260 bytes)
256. [Amps] Air gap for 12000 volts? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 22 Apr 2002 06:43:50 -0700; ? Altitude counts too. When in doubt, use a high-potential tester. cheerz, Ron - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00512.html (8,174 bytes)
257. [Amps] QSK amp switching with a TS-940s (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 22 Apr 2002 13:06:54 -0700; The 940 and the TS-440S use a similar relay for keying the amp Relay Control line on Tx. The article on circuit improvements for the 440 on my Web site shows how to replace the slow relay with a 300; /archives//html/Amps/2002-04/msg00518.html (8,052 bytes)
258. [Amps] QSK amp switching with a TS-940s (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 22 Apr 2002 20:51:32 -0700; ? How does it manage to do SSB VOX, Charlie? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00526.html (9,100 bytes)
259. [Amps] QSK amp switching with a TS-940s (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 23 Apr 2002 13:29:51 -0700; If the amp switches faster than the radio, no problem. If the amp uses RF-dectection switching, there is a problem. cheerz, Charlie - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com; /archives//html/Amps/2002-04/msg00536.html (7,560 bytes)
260. [Amps] homebrew glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 24 Apr 2002 20:00:55 -0700; ? I would build one out of groved Delrin or ABS tubing and Ni-Cr resistance wire. 12' of #22 Ni-Cr should be about right. However, we buy glass-coated wire-wound resistors for glitch service and the; /archives//html/Amps/2002-04/msg00544.html (7,966 bytes)

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