To: | <amps@contesting.com> |
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Subject: | [AMPS] splatter |
From: | jbremer@rfpo1.rfc.comm.harris.com (Bremer, James R (RFC MS-Mail)) |
Date: | Tue, 10 Jun 1997 12:12:00 -0400 |
If I may jump in here with an excerpt from "Single Sideband Principles and Circuits" page 191: "A small amount of grid-current distortion can sometimes be benefically used to partly cancel plate-current distortion. The linearity curve of most plate characteristics has an upward curve. Grid-current loading produces a downward curve, and the combination shown in Fig. 13-4 is more linear. A mathematical study of the distortion products from grid current and from plate current show they are out of phase in this case. The amount of distortion cancellation depends upon the signal level." This I believe is an old Collins text. I don't have the whole book in front of me, just a couple chapters on tube PAs. Figure 13-5 in the text shows 3rd and 5th order products increasing rapidly as the drive signal level is increased past the the point where this "dip" occurs. -Jim W2RA PS - There's also an explanation of the Collins "magic length" cable from exciter to PA, but we've probably covered that well enough already... -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm |
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