[Elecraft] LINE OUT output too low?

[David Cutter]

600ohms still seems to be the practice for ship and aircraft intercoms that 
I've come across recently.

David
G3UNA

>
> Yes. 600 ohms has not been part of audio practice, pro or consumer, for at
> least 40 years. ALL line level and mic level audio circuits, pro and
> consumer, are low impedance source, high impedance termination. The signal
> is transferred as a voltage, not as power or current. Typical output
> impedances are on the order of 100 ohms, input impedances are typically
> 10K for pro line level, 50K for consumer line level. 100 ohms is chosen
> primarily because it is a good value for isolation of op amps from the
> capacitance of the cable that it drives. This capacitance can be
> significant in pro installations, but rarely in consumer applications.
> >
> For those who are interested, there's more on this in the tutorials on my
> website. http://audiosystemsgroup.com/publish
>
> 73,
>
> Jim Brown K9YC
>
>