[Elecraft] KX3: RX audio "Line" out? Feature Request.

Dave B g8kbvdave at googlemail.com
Thu Sep 25 04:25:32 EDT 2014


One for the KX3 Firmware guru's I think.

Looking at the schematic, there might be a way to "uncouple" the Headphone 
Right and Left levels, and set them indipendantly, while also leaving the speaker 
amp enabled.

That would allow, when a cable is plugged into the "Phones" jack, the Audio DAC 
"Left" to still run the speaker (level set by the front panel AF gain) while "Right" 
is used as a fixed level "Line" output at some other (menu set?) level, for 
external digimode decoders.

(However, I've not looked at the data sheet for the TLV320AIC3105 audio codec 
chip used, yet to see if it could support that, I just suspect it might.)

If it could.  Howabout that as a feature request?   We woudnt need to faff about 
with 3.5mm jack splitters and an external powered speaker just to still "hear" 
what's going on, while plugged into an external decoder.

Or is there an existing menu feature I've missed that would do that already?

And yes, I am aware that many PC's allow you to "listen" to an input, but not all 
OS's support that on all platforms.   Nor do many hardware based digimode 
devices (TNC's and the like.)

If (a big IF) that was to be possible.  Storing such settings in a memory along 
with frequency/mode etc would be fantastic!

(A "Line IN" would be nice, but I don't se any other "already connected" ways to 
do that, though there are plenty of spare inputs to the audio codec chip.)

73.

Dave G0WBX.



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