[Elecraft] K3: Recording from LIN OUT

[Joe Subich, W4TV]

 > Unless I'm mistaken, always a possibility, the Line Out doesn't
 > have the benefit of the new LP filter, if you have that option.
 > So you still get the full IMD and digital artifacts.

Correct, Line Out does not include the LPF (which only applies to
the digital clock leakage - it does not impact IMD generation).
However, if one is going to the trouble to build an external audio
chain, LFP and EQ would normally be part of that chain.

Secondly, I'm not certain how Lyle implements the CONFIG: LIN OUT =
PHONES option anyway ... it may not have the benefit of LPF either
if the selection is made in the DSP code.

Finally, if one is going to use the speaker/headphone output to
drive an audio chain, the AF/SUB controls should be left alone
and the audio level/balance controlled with the audio chain
(proper engineering practice).

73,

    ... Joe, W4TV

On 7/21/2010 3:53 PM, Wes Stewart wrote:
> Unless I'm mistaken, always a possibility, the Line Out doesn't have the benefit of the new LP filter, if you have that option.  So you still get the full IMD and digital artifacts.
>
> --- On Wed, 7/21/10, Joe Subich, W4TV<lists at subich.com>  wrote:
>
> Lu,
>
>   >  It certainly would be nice to have a FIXED level out of that
>   >  line out jack and be able to adjust levels on the headset
>   >  mixer to the individual outputs without having the rig
>   >  volume pot interfere.
>
> The K3 has a fixed level (pre-fader level for audio pros)
> output.  Use the "Line Out" set to "nor" and set the level
> as appropriate for your external hardware.  I have not
> checked recently with a calibrated audio voltmeter, but I
> do recall easily seeing .775V RMS with a 50 uV signal and
> AGC off - I even had to reduce the RF gain to keep from
> distorting (exceeding 1V+ RMS - note the DAC output can
> go to about 4.2V P-P and with transformer loss the actual
> output should easily reach 2V P-P or .775mV RMS).
>
> The only question is adding monitor and sidetone audio
> to that "Line Out" audio ... and I don't see a digital
> mixer capable of providing that capability unless it can
> be coded into the overall DSP.
>
> The real question though is, if you are going to all the
> trouble to use a leveller, mixer, headset amplifier and
> speaker chain, why would you even attempt to adjust the
> audio on the transceiver?  Doing so is like giving an
> intern, production assistant, or news videographer a
> "greenie" and leaving them alone with the equipment<G>.
>
> 73,
>
>      ... Joe, W4TV
>
>
>
>