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361. [Amps] HV Voltmeters (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 23 Mar 2002 06:56:30 -0800; ? Amen ? In my experience, the max-V-ratings of ordinary resistors are somewhat lower. However, I have seen some Dale 5w, resistors that are rated at 15kV. The conductive film is a long spiral. chee; /archives//html/Amps/2002-03/msg00528.html (8,318 bytes)
362. [Amps] Large Bandswitches (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 23 Mar 2002 08:02:21 -0800; The most difficult part to find when building an approx. 20db amplifier is a means of bandswitching the tank L. For example, a typical 8171 amplifier generates c. 40A-rms of circulating current. Due; /archives//html/Amps/2002-03/msg00535.html (7,987 bytes)
363. [Amps] Large Bandswitches (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 23 Mar 2002 10:53:08 -0800; ? Hardly. A tetrode-with-handles amplifier is a good, do-able, un-boring learning experience. "Speak softly and carry a big stick" - TR ? Svetlana has a good price on 8171s and sockets. cheerz, Jim; /archives//html/Amps/2002-03/msg00541.html (7,437 bytes)
364. [Amps] SB-220 tuning cap needed (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 24 Mar 2002 15:45:37 -0800; The arced plates can be straightened, filed smooth and the cap will work well. The intermittent arcing is caused by an intermittent parasite at 110MHz. Lower VHF Q suppressors lower VHF amplificatio; /archives//html/Amps/2002-03/msg00560.html (7,989 bytes)
365. [Amps] SB-220 WARC bands (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 25 Mar 2002 06:25:32 -0800; ? Or wishful thinking. Furthermore, the accuracy of any RF wattmeter is dependant on the measured resistance of the termination. If a wattmeter is calibrated for 50? and the termination is 87?, the; /archives//html/Amps/2002-03/msg00571.html (10,391 bytes)
366. [Amps] SB-220 tuning cap needed (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 25 Mar 2002 08:35:16 -0800; ? When a glitch happens, if the Tune-C arcs first it protects the bandswitch. If a higher p-v Tune-C is used - like in later model 220s, the bandswitch arcs first, the contacts get toasted. There ar; /archives//html/Amps/2002-03/msg00574.html (8,191 bytes)
367. [Amps] HV Voltmeters (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 25 Mar 2002 08:35:18 -0800; ? Indeed. I buy MOF and MF resistors for the biz in boxes of 1k. I can not get a reasonable price on 500v electrolytics unless I buy 1k. cheers, Bill - R. L. Measures, a.k.a. Rich..., 805.386.3734,A; /archives//html/Amps/2002-03/msg00575.html (7,988 bytes)
368. [Amps] SB-220 WARC bands (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 25 Mar 2002 21:36:21 -0800; ? Steve -- Does it say this in the Bird® 43 manual ? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00585.html (9,081 bytes)
369. [Amps] 3-500z (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 04:24:35 -0800; ? We used to unshort them with our 11g centrifuge. However, only about 1/3 of the 3-500s were salvageable due to a grid-fil leakage problem that sometimes accompanied the parasite which bent the fil; /archives//html/Amps/2002-03/msg00588.html (7,473 bytes)
370. [Amps] 3-500z (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 04:56:59 -0800; ? A new, cold, 3-500z has a grid-filament B.V. of c. 8000v. When the hot (1820ºK) filament is bent by a burst of grid-current during an intermittent self-oscillation, it can touch and sometimes; /archives//html/Amps/2002-03/msg00590.html (8,035 bytes)
371. [Amps] Bird=ae 43 Manual (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 05:06:14 -0800; I need a quote from the Bird® 43 Owners Manual. The subject is finding true power output by subtracting the difference between forward and reflected power on the 43. tnx - R. L. Measures, a.k.a.; /archives//html/Amps/2002-03/msg00591.html (7,593 bytes)
372. [Amps] Good Source for HV Probe? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 09:54:44 -0800; ? I made one in a small plastic box with a 400M?, 50kV-rated resistor. I put a 20t trimpot across the output to zero in the calibration for a 10M? DMM load. The division ratio is 1000 to 1. Fluke se; /archives//html/Amps/2002-03/msg00600.html (7,550 bytes)
373. [Amps] 3-500z (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 09:54:45 -0800; ? The rub was more with advertisers than with the League. The match that lit the advertiser's fuse was "The Nearly Perfect Amplifier" in January, 1994 *QST*. ETO and MFJ were apparently the most voc; /archives//html/Amps/2002-03/msg00601.html (8,912 bytes)
374. [Amps] Replacement Band Switch for SB1000? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 16:47:44 -0800; MFJ/Ameritron. The AL-80 is quite similar. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00609.html (6,615 bytes)
375. [Amps] Bird=ae 43 Manual (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 16:47:45 -0800; tnx, Mark - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00610.html (7,861 bytes)
376. [Amps] Bird=c6 43 Manual (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 16:47:47 -0800; Thanks, Mark and Phil. It might be interesting to compare the calculated Fwd -Ref power delivered to a 70-ohm load with and without an extra 1/4 wavelength of coax added. - R. L. Measures, a.k.a. Ri; /archives//html/Amps/2002-03/msg00611.html (7,516 bytes)
377. [Amps] SB-220 tuning cap needed (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 17:09:12 -0800; ? Measured with an o'scope and a HV multiplier probe, in a worst case test on a SB-220 using 80m, the potential across The Tune-C was c. 3600 peak-V -- about 1000V more than normal. This is within a; /archives//html/Amps/2002-03/msg00613.html (8,151 bytes)
378. [Amps] SB-220 tuning cap needed (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 26 Mar 2002 20:25:49 -0800; Go for max V on the 'scope. However, an antenna tuner arc can reflect back to the tank and arc it. With the 8169 amp on my Web site, an arc in the 160m tuner outside would cause a 3cm arc the tank L; /archives//html/Amps/2002-03/msg00620.html (7,672 bytes)
379. [Amps] Dayton fans (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 27 Mar 2002 06:31:12 -0800; ? Kooltronics®, in Ventura, CA, makes two, types of blowers for high-pressure applications: radial-wheel, and large diameter/narrower wheel squirrel-cage types. The pressure ability of the radia; /archives//html/Amps/2002-03/msg00626.html (7,240 bytes)
380. [Amps] Dayton fans (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 27 Mar 2002 08:18:50 -0800; I bought a Dayton blower for my 70cm amp. It was a mover and a shaker. I balanced it myself. It runs hot enough to brew coffee. Agreed, but for RTTY and 3wpm CW, it is plenty good. Amen, Paul. As I; /archives//html/Amps/2002-03/msg00630.html (8,126 bytes)

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