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81. [Amps] idea for discharging caps (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Mon, 18 Mar 2002 20:14:24 -0500; Sounds like when you switch the primary to the filter cap there will be a huge voltage spike through the transformer to kill your rectifiers. 73 Gary K4FMX; /archives//html/Amps/2002-03/msg00411.html (7,261 bytes)
82. [Amps] HV Voltmeters (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Fri, 22 Mar 2002 20:48:42 -0500; David, The way I calculate it if you were to use a 100 ma meter you would need a total of 15k resistance for the whole string. 1500 / .1 amp (100 ma) = 15000 ohms. That would require a total resistor; /archives//html/Amps/2002-03/msg00522.html (10,763 bytes)
83. [Amps] Good Source for HV Probe? (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 26 Mar 2002 10:15:04 -0500; Find an old simpson 260 or tripplet vom. They have a 5 or 6 kv range depending on the meter series. 73 Gary K4FMX; /archives//html/Amps/2002-03/msg00596.html (7,417 bytes)
84. [Amps] Good Source for HV Probe? (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 26 Mar 2002 11:19:59 -0500; Naw.. jumping in front of a bus is better.; /archives//html/Amps/2002-03/msg00599.html (7,623 bytes)
85. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 26 Mar 2002 19:58:12 -0500; If the power reflects back and forth then that portion would never reach the load would it? Doesn't a bird meter read higher forward power than there really is when there is reflected power. So subtr; /archives//html/Amps/2002-03/msg00612.html (9,002 bytes)
86. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Tue, 26 Mar 2002 22:11:03 -0500; If all the reflected power was absorbed by the transmitter PA then there should be no increased forward power reading on the bird meter whether there is reflected power or not? I think that it would; /archives//html/Amps/2002-03/msg00617.html (11,630 bytes)
87. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 27 Mar 2002 10:21:13 -0500; If all the power was reflected back and absorbed by the ten-tec finals with an open termination on the line then it would be dissipating the full 100 watts in the final? How about when there is no li; /archives//html/Amps/2002-03/msg00627.html (16,949 bytes)
88. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 27 Mar 2002 18:56:28 -0500; Paul, I don't mean to sound controversial on this, just trying to stimulate some thinking on everyone's part. I don't profess to have all the answers. It can be a complicated subject and sometimes th; /archives//html/Amps/2002-03/msg00631.html (12,927 bytes)
89. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 27 Mar 2002 20:53:52 -0500; It doesn't matter what the characteristic impedance of the line is. What matters is what the meter sees. I can take a 1/2 wavelength line that has a characteristic impedance of 100 ohms or 400 ohms o; /archives//html/Amps/2002-03/msg00634.html (16,610 bytes)
90. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Wed, 27 Mar 2002 22:46:29 -0500; But you left off the most important part of what I said here. Try this sometime with a 1/2 wave length of line. Take a piece of 75 ohm cable and terminate it with a 50 ohm load. Put your watt meter o; /archives//html/Amps/2002-03/msg00636.html (17,340 bytes)
91. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 28 Mar 2002 10:30:57 -0500; Thanks Ian, This is the point that I have been trying to get across. A bird meter acts as a directional coupler with isolation between forward and reflected only when the load is a pure 50 ohm resist; /archives//html/Amps/2002-03/msg00651.html (12,160 bytes)
92. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: garyschafer@attbi.com (Gary Schafer); Date: Thu, 28 Mar 2002 11:24:20 -0500; Paul, You are looking at your bird meter with no termination on it and it is telling you that there is 100 watts of power going out and 100 watts of power going back to the radio. What we are trying; /archives//html/Amps/2002-03/msg00659.html (10,888 bytes)

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