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July 29th 05, 08:32 PM

Fred McKenzie

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In article . com,
wrote:

I have a TS-120 and I think the ears are a little weak, comparing the
rig with my 757, the s-meter on the 757 always reads more.

KJ4UO-

You shouldn't use the S-Meter to compare radios. S-Meters usually don't
tell the truth to begin with, and then some companies make their radios
read higher to make you think they are better.

Somewhere it is written that a meter should read S-9 with 50 microvolts RF
input, and that for each S-Unit there should be a 6 dB change in RF
signal. You can check this with a calibrated signal generator. However
few radios will meet these specs and not everyone agrees with the values.
In other words, it isn't as much a "standard" as such things as the AC
voltage and frequency coming into your house.

To check the receiver's "ears", you need a calibrated signal generator to
find the lowest signal level it can receive. That is its sensitivity, and
that is what you should use to compare radios regardless of S-Meter
reading.

73, Fred, K4DII

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