To: | tentec@contesting.com |
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Subject: | Re: [TenTec] Ten Tec amps and ALC |
From: | Ken Brown <ken.d.brown@verizon.net> |
Reply-to: | tentec@contesting.com |
Date: | Wed, 18 Aug 2004 12:06:58 -1000 |
List-post: | <mailto:tentec@contesting.com> |
I thought the the ALC connection on an amplifier was an OUTPUT. When the drive level to the amplifier approached an amount that would drive the amplifier into non-linearity, the signal from the amplifier ALC output was supposed to act as a sort of negative feedback, reducing the drive from the exciter. With so many exciters that put out 100 watts and more, and so many grid driven PAs that need only about 60 watts drive, it would seem like ALC would still be a good thing to have. I don't know whether there was ever any standard established as far as ALC volltage level (or even polarity) to produce a specific exciter gain reduction. With no standard established, it may be better not to have ALC at all, when mixing brands of exciters and PAs. My Titan 425 has an OVERDRIVE indicator. If I ever operated SSB, AM, PSK31 or other modes where multiple tones are used and amplitude linearity is important, I would adjust my exciter power level to make sure that the OVERDRIVE indicator on the Titan never comes on. In fact, operating CW, I do that anyway. Just not for all the same reasons. DE N6KB _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec |
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