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21. [Amps] Solid state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 17 Jun 2002 07:14:52 -0700; This one is rated 3-8v, although it said in the All Electronics catalog that it 'works on 12 volts'. However, I felt that it would be best to stay within the rating. I certainly can put a capacitor a; /archives//html/Amps/2002-06/msg00125.html (8,865 bytes)
22. [Amps] Solid state relay question++ (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 17 Jun 2002 18:54:22 -0700; But...RF bypassing fixed the problem. The bypass capacitors are much too small to adjust the power factor of the transformer. The fact that the problem ONLY occurred when transmitting into an antenna; /archives//html/Amps/2002-06/msg00130.html (7,330 bytes)
23. [Amps] Pi tanks vs Pi L + LOW PASS (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 27 Jun 2002 19:47:35 -0700; I presume that means you're thinking about a single TVI-type lowpass filter. Such filters have cutoffs around 30 or 50 MHz. That would do nothing to reduce the low-order harmonics of the low bands --; /archives//html/Amps/2002-06/msg00250.html (8,346 bytes)
24. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 14 May 2002 16:08:23 -0700; What if the signal is being picked up by one of the other antennas, and some non-linear device (like pin diodes in a QSK circuit) is generating the signal and radiating it? (although why a SUB-harmon; /archives//html/Amps/2002-05/msg00203.html (9,581 bytes)
25. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 14 May 2002 16:10:22 -0700; and see what happens. Oops, I meant the 14 MHz transmitting antenna. Vic K2VCO; /archives//html/Amps/2002-05/msg00204.html (9,289 bytes)
26. [Amps] Using door knob caps as padders/blockers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 23 May 2002 08:47:57 -0700; My SB-1000 did, too. Recently I thought I could get away with using a Sprague 1000 pf 6KV doorknob in my 160 meter antenna tuner. This one is about 1" dia, 5/8" high (2.5cm x 1.5cm), significantly la; /archives//html/Amps/2002-05/msg00388.html (8,387 bytes)
27. [Amps] RF Ground for 2nd Floor (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 15 Apr 2002 15:31:01 -0700; There are three types of ground that your station needs. One is the lightning protection system, which the Polyphaser link covers. It takes a significant amount of money and work to do it right. The; /archives//html/Amps/2002-04/msg00369.html (9,139 bytes)
28. [Amps] Solid State HF amps and kits (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 19 Apr 2002 07:47:41 -0700; Why aren't the relay switched low-pass filters that are used in all legal solid-state amps adequate? What would be the advantage of 'tracking the VFO'? 73, Vic, K2VCO Fresno CA; /archives//html/Amps/2002-04/msg00473.html (9,042 bytes)
29. [Amps] equalizing resistors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 01 Mar 2002 07:54:06 -0800; If you do not use equalizing resistors, the 2200 volts will divide across the two caps in inverse proportion to their leakage resistance. With electrolytics, there often are wide variations in leakag; /archives//html/Amps/2002-03/msg00009.html (7,692 bytes)
30. [Amps] al-1200 question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 08 Mar 2002 08:03:44 -0800; But if you increase antenna gain you are increasing signal strength just because you are narrowing the beamwidth (in the horizontal or vertical plane, or both). Since the desired signal comes from o; /archives//html/Amps/2002-03/msg00163.html (8,853 bytes)
31. [Amps] al-1200 question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 08 Mar 2002 10:09:15 -0800; That's exactly the case in which it I think it DOES apply. The signal comes from one point, but the noise comes from all over. So as you narrow the beam width you reduce the sum total of noise that i; /archives//html/Amps/2002-03/msg00180.html (9,553 bytes)
32. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 10 Mar 2002 08:31:19 -0800; I don't disagree with this. I was trying to explain intuitively why a directive antenna has a better s/n ratio than a non-directive one. I was assuming that the noise was evenly distributed. Then I r; /archives//html/Amps/2002-03/msg00212.html (10,456 bytes)
33. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 11 Mar 2002 07:46:01 -0800; This implies that what Tom called the average gain of the antenna is not great enough to override the rx generated noise. A low-noise preamp would boost both signal and noise from the antenna and sol; /archives//html/Amps/2002-03/msg00235.html (8,779 bytes)
34. [Amps] Heathkit SB-1000 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 11 Mar 2002 08:19:04 -0800; I sold mine recently for $450. It will deliver around 800w CW, 1000w PEP SSB on all bands from 160-10 meters, if you replace the plate RF choke with an Ameritron AL80B unit to eliminate a resonance n; /archives//html/Amps/2002-03/msg00236.html (7,008 bytes)
35. [Amps] Heathkit SB-1000 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 11 Mar 2002 11:18:22 -0800; It has a single 3-500Z instead of a pair. It also covers 160 meters, which the SB-220 did not. You will have to ask their (retired, I guess) marketing dept. why they made it! 73, Vic, K2VCO Fresno CA; /archives//html/Amps/2002-03/msg00245.html (6,751 bytes)
36. [Amps] 12V 120A Switcihng Power supply? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 31 Mar 2002 13:56:51 -0800; Look at http://www.kunnallislehti.fi/finnfet/ 73, Vic, K2VCO Fresno CA; /archives//html/Amps/2002-03/msg00718.html (7,397 bytes)
37. [AMPS] Chassis for HB Amps (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Wed, 02 Jan 2002 10:30:21 -0800; Are these the kind with a cutter that slides on a bar? How thick can the aluminum be? What speed do you need to set the drill press at? Lots of questions! I've seen these, but I was afraid my drill p; /archives//html/Amps/2002-01/msg00017.html (7,919 bytes)
38. [AMPS] Parasitic Experience? What to do? (LONG) (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 28 Jan 2002 09:16:02 -0800; The original Eimac tube shows no grid-to-anything shorts. It's been my experience that some Eimac 3-500z's develop grid-cathode shorts when they are hot, which then go way when the tube is cool. Alth; /archives//html/Amps/2002-01/msg00230.html (7,511 bytes)
39. [AMPS] Solid-state drivers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 18 Dec 2001 18:36:31 -0800; I have a Henry 750-watt solid-state amp which likes about 65-100 watts drive for full output. I also have a smaller Henry 100 watt solid state amp which I have, from time to time, used to boost the o; /archives//html/Amps/2001-12/msg00334.html (6,887 bytes)
40. [AMPS] FS: 3200v 1 amp CCS plate supply $395 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 20 Nov 2001 09:29:06 -0800; OK, now two guys have gotten me to take this off the market and then not picked it up! For sale, homebrew plate supply for RF amplifier. Has a brand new Peter Dahl hypersil transformer rated 2400 vac; /archives//html/Amps/2001-11/msg00384.html (7,421 bytes)

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