Mail Archive Search: <+from:w8ji@contesting.com>

Results:

References: [ +from:w8ji@contesting.com: 1253 ]

Total 1253 documents matching your query.

81. [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 3 Apr 2002 07:27:11 -0500; No, that is NOT true. If the slugs only sense the current pulse, it would be technically impossible for them to have directivity. Current reverses direction at the frequency of operation, during the; /archives//html/Amps/2002-04/msg00110.html (12,415 bytes)
82. [Amps] unstable Ameritron AL811 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 4 Apr 2002 07:21:45 -0500; Most common would be tubes and/or open grid resistors on the tubes. Not much else goes wrong with that amp, other than dial lights and tubes. 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-04/msg00144.html (6,835 bytes)
83. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Bird® 43 Ma nua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 4 Apr 2002 07:21:45 -0500; It is electrically impossible to have a single-point measurement in a transmission line that measures forward and reflected power without sampling both voltage and current. I am amazed that some cla; /archives//html/Amps/2002-04/msg00145.html (11,799 bytes)
84. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Re: [Amps ] Bird® 43 Ma nua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 6 Apr 2002 07:49:17 -0500; Not really. If you subtract the reflected power from the forward power, you get the true power delivered to the load. In the case you detailed it is 200F-200R=zero watts. Like most rigs, your Heathk; /archives//html/Amps/2002-04/msg00210.html (9,158 bytes)
85. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Re: [Amps ] Re: [Amps ] Bird® 43 Ma nua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 6 Apr 2002 07:49:18 -0500; OK, just as it should. You have proven the meter is reliable for reading true power when reflected is subtracted from forward power. If you prefer circuit theory rather than wave mechanics, consider; /archives//html/Amps/2002-04/msg00211.html (11,804 bytes)
86. [Amps] Directional coupler design (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 6 Apr 2002 07:49:18 -0500; Most plasma tubes I've seen have reactance, and even if they somehow don't have significant reactance there will be reactance added from the mismatch in interconnecting leads. That means you'd have; /archives//html/Amps/2002-04/msg00212.html (7,229 bytes)
87. [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 31 Mar 2002 21:31:38 -0500; The Bird 43 element, like every other directional coupler device that measures forward and reflected power at one single point in a transmission line (rather than points separated by an appreciable; /archives//html/Amps/2002-03/msg00005.html (7,558 bytes)
88. [Amps] al-1200 question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 10 Mar 2002 07:52:33 -0500; Noise does not multiply by peak antenna gain, unless the noise is in the peak response of the antenna. My web page outlines how to do this, but what you do is take the ratio average gain to gain in; /archives//html/Amps/2002-03/msg00207.html (10,801 bytes)
89. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 10 Mar 2002 20:11:26 -0500; It depends on what the reference antenna is. An isotropic radiator has several dB gain over a GAP vertical on 80 meters, even though it is less directional. Gain is a function of efficiency and dire; /archives//html/Amps/2002-03/msg00220.html (8,775 bytes)
90. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 13 Mar 2002 04:27:31 -0500; Please don't attribute any statement noise should be the same regardless of directive pattern to me! That doesn't mean anything definitive. It might be sufficient, it might not be. When one receiver; /archives//html/Amps/2002-03/msg00275.html (9,208 bytes)
91. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 14 Mar 2002 05:59:15 -0500; No, that is not true. The antennas can and often do have vastly different directional properties even with the same gain. 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-03/msg00285.html (8,344 bytes)
92. [Amps] 10 Meters (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 14 Mar 2002 05:59:15 -0500; The FT1000MP's of a contestor I looked at had the internal power limit pots cranked up so the FT1000MP's would run 150 watts. SSB IM products were over fifteen dB worse in the radios at 150 watts th; /archives//html/Amps/2002-03/msg00286.html (8,323 bytes)
93. [Amps] Antenna vs. amp (was: al-1200 question) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 14 Mar 2002 22:02:50 -0500; I know what you are trying to say, but that still is not true. Efficiency can be different and/or considerable power can go into spurious lobes on one and not the other. For example, Rhombics have v; /archives//html/Amps/2002-03/msg00337.html (9,021 bytes)
94. [Amps] Dentron GLA 1000 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 22 Mar 2002 09:23:08 -0500; Let's think about it. 1.) You can not easily get tubes any longer 2.) The amps are terribly unstable on ten meters because the "designer" directly copied the Bill Orr Handbook where the cathodes are; /archives//html/Amps/2002-03/msg00500.html (7,170 bytes)
95. [Amps] SB-220 WARC bands (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Mar 2002 06:59:42 -0500; The factory designed rating for the SB-220 is 1kW INPUT (~600w output) on CW and RTTY, and 2KW PEP on SSB (~1200 watts PEP out) on SSB. Good meters, like the Bird 43, have +-5% of full scale anywher; /archives//html/Amps/2002-03/msg00565.html (8,338 bytes)
96. [Amps] SB-220 WARC bands (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Mar 2002 20:05:33 -0500; That's absolutely correct with the Bird Steve. To read true power into a somewhat reasonably mismatched load (say under 3:1 SWR or so), you simply subtract reflected power from forward power. 73, To; /archives//html/Amps/2002-03/msg00582.html (7,894 bytes)
97. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 28 Mar 2002 07:12:37 -0500; There are at least two ways to look at the problem, both are correct as long as you stay within the boundaries of the model. There actually is a reflected wave with any mismatch, even in the system; /archives//html/Amps/2002-03/msg00640.html (13,036 bytes)
98. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Bird® 43 Ma nua (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 29 Mar 2002 07:16:12 -0500; Conservation of energy makes that true. The radio has to be outputting 20 amperes times 13.8 volts worth of energy in some fashion...either by light, RF, heat, mechanical energy or something. My poi; /archives//html/Amps/2002-03/msg00678.html (11,658 bytes)
99. [AMPS] Power out indicator (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 18 Feb 2002 06:35:39 -0500; I hear that rumor repeated, but I've never been able to find that in any tuner I have ever seen. What does happen is there is a smooth and gradual reduction in efficiency as the Q is made higher, bu; /archives//html/Amps/2002-02/msg00182.html (9,594 bytes)
100. [AMPS] Power out indicator (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 18 Feb 2002 21:27:05 -0500; With a reasonable load connected? No way! Perhaps you are confusing an unwanted self-resonance in a roller with the tuner "loading into itself". The reduction in efficiency is so gradual and slight; /archives//html/Amps/2002-02/msg00191.html (9,264 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]