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1. [Amps] Switch Help Needed (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 02 Jan 2003 21:23:16 -0500; There used to be a company that made ultrasonic transducer / display units for the marine industry. The transducer mounted on the bottom of the tank and sensed the top surface of the water. I had one; /archives//html/Amps/2003-01/msg00020.html (9,848 bytes)
2. [Amps] T'bolt ideas (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 11 Jan 2003 19:45:59 -0500; SWAMPING RESISTOR: If I remember right, the thunderbolt has a link coupled tuned input circuit that can be used or not used. If not used then the 200 ohm resistor was used. With the tuned input circu; /archives//html/Amps/2003-01/msg00096.html (9,842 bytes)
3. [Amps] re Negative lead filtering (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sun, 01 Dec 2002 21:28:38 -0500; Hi Rick, I don't know where he gets that the output voltage will be any different with the choke in the negative lead rather than the positive lead. As far as rectifying the voltage across the choke; /archives//html/Amps/2002-12/msg00012.html (9,259 bytes)
4. [Amps] Neutral vs Ground Connection for 220 VAC (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 11 Dec 2002 23:24:37 -0500; Hi Mike, The only appliance that is "legal" for ground and neutral together is an electric stove. That is now being phased out to a 4 wire circuit. The 3 wire version for the stove had to be a dedica; /archives//html/Amps/2002-12/msg00168.html (9,860 bytes)
5. [Amps] Dow-Key Coaxial Relays` (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 04 Nov 2002 17:20:58 -0500; Just about every Dow Key relay I come across I find that the receive side of the relay goes bad. Those are the ones that have the movable contact on the receive side that is supposed to short out the; /archives//html/Amps/2002-11/msg00028.html (7,742 bytes)
6. [Amps] RE: Troubleshooting a SB-200 (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 05 Nov 2002 19:36:37 -0500; Hi Steve, weak tubes. One seems to be weaker than the other. You should get around 600 watts or so out of the SB200. Plate current should be around 500 ma. Don't rely too much on the plate voltage re; /archives//html/Amps/2002-11/msg00046.html (9,701 bytes)
7. [Amps] RMS-PEP & 2x8877 (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 07 Nov 2002 15:46:00 -0500; As Bill says "there is no RMS power". RMS power is a common misconception and it confuses things when you start to convert things. There is only average power that is derived from RMS voltage and RMS; /archives//html/Amps/2002-11/msg00109.html (15,352 bytes)
8. [Amps] RMS-PEP & 2x8877 (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 07 Nov 2002 18:38:46 -0500; You are right! It does get confusing. There are two factors that come into play. The average RF power and the average modulation power. You could call it the average of the average power. :>) With a; /archives//html/Amps/2002-11/msg00113.html (10,606 bytes)
9. [Amps] RMS Power (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sun, 10 Nov 2002 20:46:23 -0500; What is often confused is the fact that many people think that RMS power is the amount of power needed to be dissipated in a resistor to produce the same amount of heat that an equivalent amount of D; /archives//html/Amps/2002-11/msg00163.html (12,566 bytes)
10. [Amps] RMS Power (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 11 Nov 2002 09:24:54 -0500; And just ask them how much "RMS power you get with a single tone". They will tell you "you can't do that". "The amp can't handle a single tone it will blow up." "It is a complicated measurement". The; /archives//html/Amps/2002-11/msg00170.html (7,598 bytes)
11. [Amps] LP filter effects (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 16 Nov 2002 15:48:20 -0500; A low pass filter does not necessarily have a flat 50 ohm response. Especially when you get to 10 meters. It is already starting to roll off some. This produces some reactance which will show up as a; /archives//html/Amps/2002-11/msg00277.html (9,039 bytes)
12. [Amps] Controlling blower fan speed... (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 16 Nov 2002 15:51:16 -0500; I have used a series capacitor to slow the blower speed down. Then place a temperature switch above the tube in the air path that will short out the capacitor when things heat up. 73 Gary K4FMX; /archives//html/Amps/2002-11/msg00278.html (7,775 bytes)
13. [Amps] Passive grid: How to calculate..... ? (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 22 Nov 2002 11:42:22 -0500; The math looks right to me. If your going to run the tubes in AB1 then whatever the bias voltage is set at is the maximum peak voltage that you need. Any more and you will drive the tubes into grid c; /archives//html/Amps/2002-11/msg00343.html (9,752 bytes)
14. [Amps] Passive grid: (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 28 Nov 2002 20:26:24 -0500; Hi Rich, I have always worried about using a zener string from the HV supply for the screen. What happens if the plate choke or something else should open in the plate circuit? Also if one were to tu; /archives//html/Amps/2002-11/msg00393.html (7,147 bytes)
15. [Amps] Passive grid: (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 29 Nov 2002 20:55:06 -0500; But there WILL be screen voltage and no plate voltage if a plate choke should open as an example. Could the screen be damaged with full screen voltage and full screen current with no plate voltage? O; /archives//html/Amps/2002-11/msg00408.html (9,156 bytes)
16. [Amps] Passive grid: (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 30 Nov 2002 15:57:43 -0500; Thanks Rich, 73 Gary K4FMX; /archives//html/Amps/2002-11/msg00421.html (6,842 bytes)
17. [Amps] Re: AB1 v. AB2 (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 30 Nov 2002 18:09:59 -0500; To: <amps@contesting.com> So how would you "design an AB1 amp that could never go into grid current" with increased drive? 73 Gary K4FMX; /archives//html/Amps/2002-11/msg00423.html (12,529 bytes)
18. [Amps] Re: AB1 v. AB2 (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Sat, 30 Nov 2002 18:42:41 -0500; To: <amps@contesting.com> Well designed AB1 RF amplifiers are almost always AC coupled to the grids too in a grid driven amplifier. They are no different than audio amplifiers. Either can be driven i; /archives//html/Amps/2002-11/msg00426.html (15,184 bytes)
19. [Amps] skin effect (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 04 Oct 2002 23:37:14 -0400; Skin effect is just as important at 60 hz as it is at RF. At 60 hz one skin depth is about 1/3 of an inch. It is important in power transmission systems. Multiple conductors spaced apart are used rat; /archives//html/Amps/2002-10/msg00035.html (11,523 bytes)
20. [Amps] Gonset Amplifier (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 18 Sep 2002 18:28:37 -0400; The schematic of the P&H is in the CQ SSB handbook. 1959 I think the handbook came out. Not much too it. Used the roller coil from a command transmitter. The plate tuning cap was from, I think, a bc3; /archives//html/Amps/2002-09/msg00143.html (13,125 bytes)

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