To: | "Michael Tope" <W4EF@dellroy.com> |
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Subject: | Re: [Amps] 10dB and propagation |
From: | R.Measures <r@somis.org> |
Date: | Tue, 8 Feb 2005 14:59:57 -0800 |
List-post: | <mailto:amps@contesting.com> |
On Feb 8, 2005, at 9:56 AM, Michael Tope wrote:
Correct, and it was repeatedly repeated to factor out the QSB factor. That would imply that the ionospheric plasma heating due to the 8171 output was almost instantaneous. Agreed. It was fast and not predictable. If that were true, I would expect that the thermal conditioning of the plasma could follow the syllabic envelope thereby causing distortion. My take on the phenomenon is that it was not thermal or there would have been a lag time. My guess is that the ionosphere's electrons were on the threshhold of jumping up to the next orbit and the extra energy gave them a push. And if 16KW PEP to a dipole would cause 3dB distortion, the just imagine how bad a foreign broadcast station would sound running AM with 500 KW to a curtain array. Foreign broadcast near the 40m and 80m bands during the daytime is a different subject. This condition was observed only after sunrise between adjacent Western states, so the D-layer was a factor. If the thermal conditioning were a bit too slow to follow the syllabic envelope, then you would be able to see some droop on the RX audio output (w/agc off) if you pulse modulated the 8171 exciter between say 1 watts and 100 watts with a 50% duty cycle square wave. I ran mine from a 100A service with .075-ohms of ESR, but I tuned up the sucker with a tuning pulder. cheerz, Mike. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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