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Best Way to build a calibrated S meter

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May 23rd 06, 06:48 PM posted to rec.radio.amateur.homebrew

Fred McKenzie

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Best Way to build a calibrated S meter

In article ,
wrote:

Two caveats, rarely are RX input impedences 50 ohms and there is no
guarentee that the antenna is 50 ohms.

Allison-

Such is life. However you can assume that both are 50 Ohms and use a
resistive pad between the signal generator and the receiver when
calibrating. When making a reading, use a pad between the unknown signal
source and the receiver.

Without a sophisticated system capable of determining impedances while
making measurements, this may be the best you can do.

Fred

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