[amsat-bb] Re: SNR measurements

[Ronald Long <rlong3@xxxxxxxxxxxxxxx>]

NX7U wrote:
Once again, Domenico is right on the money--the key is a constant bandwidth 
measurement that includes the noise in the bandwidth.
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One other possible source of error is the fact that the output impedance of 
modern receivers is not constant or accurately known. An article I read 
suggested connecting an output transformer in reverse to the speaker 
terminals, say 8 ohms to a known value, R. Connect a 1W resistor of value R 
across the R winding and connect the audio voltmeter across R.

ron w8gus. 

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