To: | Amplificadores Lineales <amps@contesting.com> |
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Subject: | Re: [Amps] 10 DB increase |
From: | GGLL <nagato@arnet.com.ar> |
Date: | Sat, 05 Feb 2005 11:29:55 -0300 |
List-post: | <mailto:amps@contesting.com> |
Ken, IMHO it's non linear (a simpler, bad design) or unadjusted metering
system. In older receivers with S-meters calibrated in microvolts, a 10 dB
power increase reflects as a 20 Db input change. Concerning S-meter systems, the best I have seen were mainly Kenwood's with needle instruments (TS 430, 440) and a few Icoms (three adjustment pots!, and you see the result). In those Kenwoods, during the adjustment process you also tweak for "mis-alignment" one of the IF-unit's tuned can. I guess this way they achieve the accurate readings. I also believe that what's in the "middle" of both antennas should affect equally both signal power levels, don't they? (a linear propagation media). But as said in another e-mail in the case of fast changing condx, several tests should average readings. Best regards Guillermo - LU8EYW. kenw2dtc escribió: "Many years ago, an old timer (W6SDM) told me that to make a noticable difference on HF SSB, it took +10db."
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