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Total 562 documents matching your query.

261. Re: [Amps] Building an Amp 101 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 20 Jan 2014 04:48:15 -0500
On 1/19/2014 8:20 AM, N1BUG wrote: On 01/18/2014 03:16 PM, Roger (K8RI) wrote: There is actually a preferred length, width, and height ratio that can easily be maintained. I presume this refers to de
/archives//html/Amps/2014-01/msg00177.html (21,543 bytes)

262. Re: [Amps] Building an Amp 101 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 21 Jan 2014 04:26:09 -0500
On 1/19/2014 8:48 AM, Chris Wilson wrote: I think if you like the retro look building a vintage style amplifier, outward appearance wise, can yield good results on a budget. Trying to create somethin
/archives//html/Amps/2014-01/msg00204.html (10,261 bytes)

263. Re: [Amps] MOVs (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 24 Jan 2014 12:14:37 -0500
On 1/24/2014 1:37 AM, Jim Brown wrote: On 1/23/2014 10:02 AM, Carl wrote: Inductive industrial equipment use big MOV's for spike suppression on single and 3 phase lines of many voltages. Again, the p
/archives//html/Amps/2014-01/msg00241.html (10,996 bytes)

264. Re: [Amps] MOVs (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 25 Jan 2014 22:57:10 -0500
On 1/24/2014 12:49 PM, Saandy wrote: Guys , think! Nothing gets conducted to a point not connected anywhere! A MOV is intended to a supposedly safe limit a voltage differential between 2 points. Prot
/archives//html/Amps/2014-01/msg00247.html (12,401 bytes)

265. Re: [Amps] MOVs (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 28 Jan 2014 02:22:47 -0500
Between hot and neutral on a 120V branch circuit is fine. Also OK between Line and Line on 240V. Be careful though, many an old house has had the neutral grounded in the outlet instead of back at the
/archives//html/Amps/2014-01/msg00269.html (10,876 bytes)

266. Re: [Amps] Tube swap (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 29 Jan 2014 02:03:14 -0500
On 1/28/2014 6:11 PM, Carl wrote:The handbook has a good section on designing them, but after you get all the info, and calculations, you have to take into account stray inductance and capacitance. I
/archives//html/Amps/2014-01/msg00290.html (14,366 bytes)

267. Re: [Amps] Weird tubes in an amplifier (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 29 Jan 2014 17:22:33 -0500
REPLY: I never saw one in a TV, but they are an old tube. Often used as an oscillator. I've seen amps designed with the tubes on the bottom and set in water. Looked really strange but added greatly t
/archives//html/Amps/2014-01/msg00302.html (10,384 bytes)

268. Re: [Amps] Weird Tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 30 Jan 2014 19:54:56 -0500
I run them as a 450TL and the glow is sure nice. Glow...I mentioned my 6C21 amp. I drove it with an HT37. Thing is, I forgot to turn the drive down so the first, and only transmission from that tube
/archives//html/Amps/2014-01/msg00328.html (13,382 bytes)

269. Re: [Amps] Tube swap (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 30 Jan 2014 19:58:09 -0500
you dont need a socket either. 9 kw out the other night. I worked an FB111 headed for a refueling down over Texas. I have a QSL card around here somewhere. I imagine his gear was a bit more compact.
/archives//html/Amps/2014-01/msg00329.html (8,452 bytes)

270. Re: [Amps] AL-1200 T/R problem (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 01 Feb 2014 03:56:57 -0500
It really did work but The texture of the bills has changed drastically in the last few years. I believe a NEW $5, $10, or $100 with the $00 being the best. I don't have any $50 bill to compare, but
/archives//html/Amps/2014-02/msg00000.html (9,279 bytes)

271. Re: [Amps] Recommended Tuner for Clipperton L (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Feb 2014 02:40:52 -0500
Most tuners that cover the frequency range and the impedance ranges should work well. Remember, that thy all are derated when looking into a low impedance. So you need one that will operate at that p
/archives//html/Amps/2014-02/msg00007.html (8,118 bytes)

272. Re: [Amps] Recommended Tuner for Clipperton L (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Feb 2014 13:48:00 -0500
For 160 a good 500pf is needed and 250-300 for 80. The big Palstar tuners have worked well for me. The AT-5K and AT-5K HP. I don't see the AT5K HP listed any more. It was a coax only tuner with no me
/archives//html/Amps/2014-02/msg00010.html (11,346 bytes)

273. Re: [Amps] Recommended Tuner for Clipperton L (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Feb 2014 16:37:46 -0500
Roger, Would you please explain "hiss"? iss as in hi voltage arc. Sounds just like a cat or snake. What, precisely, is happening to create that sound? If the antenna in highly reactive (inductive) a
/archives//html/Amps/2014-02/msg00012.html (11,272 bytes)

274. Re: [Amps] Recommended Tuner for Clipperton L (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Feb 2014 17:26:33 -0500
That's why I'm looking only at non-roller/rotary inductor tuners - to remove the mechanical movement variable and the concern about an under-rated device in an affordable tuner. Don't both the Dentro
/archives//html/Amps/2014-02/msg00015.html (10,696 bytes)

275. Re: [Amps] Recommended Tuner for Clipperton L (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Feb 2014 18:50:26 -0500
I run the legal limit and have used tuners with rotary inductors in all but the early Dentrons. They did require periodic cleaning and before the legal limit went from 1 KW DC input (600 out or abou
/archives//html/Amps/2014-02/msg00017.html (11,415 bytes)

276. Re: [Amps] Air temps leaving the amp. (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 03 Feb 2014 08:53:06 -0500
Build the simple manometer shown in the handbook. If you are running the required pressure, then yoy are running the require air flow. Measure right across the tube to get the most accurate. Find wh
/archives//html/Amps/2014-02/msg00024.html (9,430 bytes)

277. Re: [Amps] Air temps leaving the amp. (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 03 Feb 2014 18:53:26 -0500
The only way to vary the speed of such a motor is either by changing the frequency of the power source or with a variable speed transmission. How does Emtron do it? They use a sensor in the exhaust,
/archives//html/Amps/2014-02/msg00035.html (10,745 bytes)

278. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Feb 2014 04:19:39 -0500
On 2/9/2014 11:44 PM, Jim Garland wrote: Hi Jim, I'm guessing the relay shorted because of a voltage transient, not a current overload. A possible culprit would be the inductive kick from the plate t
/archives//html/Amps/2014-02/msg00068.html (8,304 bytes)

279. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Feb 2014 22:45:49 -0500
Wrong relay for the application? Some sort of TVS or MOV needed? I've mentioned before, we used 50,000 Joule MOVs across back to back SCRs. We'd get 2 or 3 guys on the back end of a fork lift to keep
/archives//html/Amps/2014-02/msg00088.html (11,617 bytes)

280. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Feb 2014 22:50:35 -0500
So, perhaps the more critical scenario is at switch off? Having worked with SCRs and Triacs I'd much rather switch on at peak power than switch off while drawing current. The Collapse of the magnetic
/archives//html/Amps/2014-02/msg00089.html (11,509 bytes)

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