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81. Re: [Amps] IM distortion and such (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 28 Jun 2006 13:41:01 -0400; They will certainly arc if the operator is improperly loaded <G>. However if the amplifier is underloaded, voltage in the output "tank" will increase. The "limit" for underloading is operating into a; /archives//html/Amps/2006-06/msg00584.html (8,948 bytes)
82. Re: [Amps] IM distortion and such (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 28 Jun 2006 07:42:33 -0700; The slope of the line represents the transfer characteristic. In the region where where the line is straight, the transfer characteristic is constant and amplification is linear therein. Correctomund; /archives//html/Amps/2006-06/msg00585.html (12,896 bytes)
83. Re: [Amps] IM distortion and such (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 28 Jun 2006 09:32:08 -0700; The tranfer characteristic at any instant if the slope of the constant current line where the load line crosses it. If the slope of the 3-500Z's 3a crossing point is not the same as the slope where t; /archives//html/Amps/2006-06/msg00588.html (11,806 bytes)
84. Re: [Amps] IM distortion and such (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 28 Jun 2006 10:22:19 -0700; The typical drive is c. 85w. For linear operation, max useable emission is c. 2.5a-peak. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list; /archives//html/Amps/2006-06/msg00591.html (8,890 bytes)
85. Re: [Amps] IM distortion and such (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 28 Jun 2006 14:02:02 -0400; If that is true, it is impossible to design a "clean" amplifier around the 3-500Z. A simple examination of the constant current curves for grounded grid operation shows that the constant current line; /archives//html/Amps/2006-06/msg00593.html (11,837 bytes)
86. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 16:09:21 -0400; It can be proven beyond a doubt if it is possible to get a VHF arc in any amplifier. It only takes a little logical thinking, and a little test equipment to measure voltage levels through the system; /archives//html/Amps/2006-06/msg00602.html (10,070 bytes)
87. Re: [Amps] IM distortion and such (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 28 Jun 2006 20:08:57 -0700; Depends on whether the Tune-C or the bandswitch has the lower BDV. If the Tune-C arcs at 3600v and the bandswitch arcs at 5000v (SB-220), the Tune-C protects the bandswitch. R L MEASURES, AG6K. 805-3; /archives//html/Amps/2006-06/msg00614.html (9,706 bytes)
88. Re: [Amps] IM distortion and such (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 29 Jun 2006 09:11:26 +0200 (CEST); had high level "sweet spots" where the positive slope of IMD level as a function of input power actually reversed and formed a local minimum at a fairly high input power level.< Yes, Mike, it's a wel; /archives//html/Amps/2006-06/msg00617.html (8,622 bytes)
89. Re: [Amps] IM distortion and such (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 29 Jun 2006 07:12:10 -0700; I was looking at this earlier this evening. The load line is just a straight line approximation based on a couple of points. The actual transfer curve (Eb vs Eg) will depend on the slope and spacing; /archives//html/Amps/2006-06/msg00628.html (11,622 bytes)
90. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 29 Jun 2006 12:00:33 -0400; I'm not sure how other companies do it, but looking at various operating conditions was standard practice for Heath and early Ameritron. I guess the answer is how many time-consuming homework assign; /archives//html/Amps/2006-06/msg00633.html (10,138 bytes)
91. Re: [Amps] IM distortion and such (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 29 Jun 2006 17:23:32 +0100; Is it worth mentioning that the 'tune then back off peak Ia' achieves the same (or very similar) end result as tuning for maximum Po, then increasing the loading a little bit which many folks practic; /archives//html/Amps/2006-06/msg00634.html (9,938 bytes)
92. Re: [Amps] IM distortion and such (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 29 Jun 2006 22:01:35 -0500; Joe, That is exactly Rich's point. The degree of loading has no effect on VHF energy. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2006-06/msg00646.html (10,326 bytes)
93. Re: [Amps] IM distortion and such (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 29 Jun 2006 22:08:15 -0500; It will also reduce efficiency. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00647.html (12,105 bytes)
94. Re: [Amps] IM distortion and such (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Thu, 29 Jun 2006 23:35:53 -0400; Gary, you make the same mistake Rich does ... the voltage is not necessarily due to parasitic oscillation at VHF frequencies. An unloaded tank can generate voltages several times that of the applied; /archives//html/Amps/2006-06/msg00648.html (9,960 bytes)
95. Re: [Amps] IM distortion and such (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 29 Jun 2006 22:46:29 -0500; Joe, I am only addressing your statement that "heavier loading may reduce VHF parasitics". 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2006-06/msg00649.html (10,559 bytes)
96. Re: [Amps] IM distortion and such (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 29 Jun 2006 21:06:36 -0700; Yes, I agree, Gary. 73, Mike W4EF...................... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00650.html (10,295 bytes)
97. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 05:21:51 -0400; Almost never would be a more accurate way of saying it. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00656.html (9,163 bytes)
98. Re: [Amps] IM distortion and such (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 30 Jun 2006 09:48:35 -0400; Tom, So by you saying "almost", your saying it could happen? Best, Will ** REPLY SEPARATOR ** On 6/30/06 at 5:21 AM Tom W8JI wrote: _______________________________________________ Amps mailing list A; /archives//html/Amps/2006-06/msg00659.html (9,930 bytes)
99. Re: [Amps] IM distortion and such (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 30 Jun 2006 03:54:40 -0700; Not a sound wager. Can an unloaded tank reach potentials higher than the breakdown voltage of its Tune C? grasping straws? The problem in this case is that a HF/MF low-pass Pi-network tank rejects VH; /archives//html/Amps/2006-06/msg00662.html (10,248 bytes)
100. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 11:11:45 -0400; When we can't possibly know every circumstance in the world, never couldn't apply. Besides, VHF starts at 30 MHz. An oscillation at 30MHz in a tank resonant near ten meters could be a problem since; /archives//html/Amps/2006-06/msg00666.html (9,469 bytes)

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