FW: [Elecraft] First pass... sidetone output tests

Mon Sep 30 23:42:00 2002

Hi Dan:

I was probably one of the very first, a couple years ago, to mention having 
what I believe to be low audio output. The 'quality' of the audio is great, 
just low level... and ONLY of RECEIVED audio, not the sidetone, which is 
quite acceptable thru the speaker when ST L = 050.

73,

Tom Hammond   N0SS

>Tom: Do you have "good audio" or "bad audio"? Your measurements are
>extremely interesting, but have no meaning without the qualitative
>descriptor<g>.
>
>Dan / WG4S / K2 #2456 - Good Audio
>
><snip>
>                 O'scope    RMS DMM      Comment
>        RP7-8   0.40V p-p (88.5mV RMS)
>        RP3-4   0.22V p-p (81.7mV RMS)
>        RP3-6   0.20V p-p (71.5mV RMS)
>        U10B-7  0.20V p-p (74.0mV RMS)
>        U9-8    0.29V p-p (106.7mV RMS)   BYPASS of U9
>        U9-6    0.30V p-p (107.0mV RMS)   AF OUT of U9
>        Spkr    0.26V p-p (92.0mV RMS)    @ 4 Ohms load
>                                    Note: I get 1.4V p-p (743 mV RMS)
>                                          across the 4 Ohm SPKR output
>                                          load when ST L = 255
><snip>
>
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