[Moon] AC audio voltmeter via soundcard

[phil]

Hi All,

I wonder if there is a win freeware program using soundcard that can tell me the 
value of the audio voltage at the input of the sound card, via mic or line 
input. If it could average the data it would be fine also. I would like to use 
it for sun noise measurement and other source also, to get a good reading on my 
antenna gain.
Via my voltmeter is not that good.
I have found some spectrum analyser and oscilloscope software but none can give 
me this value.
Tks in advance.
I will send my results on 70cms asap. 26 qsos and found cdx not that good...

Vy73 - Phil - FR5DN