KX3: RX audio "Line" out? Feature Request.

[g8kbvdave]

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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[Gerald Wilson]

This would be amazing and a huge help with digital modes.

On September 25, 2014 4:25:32 AM EDT, Dave B <[hidden email]> wrote:

>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.
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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[Jim Brown-10]

On Thu,9/25/2014 1:25 AM, Dave B wrote:
> 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.

Consumer line level is 1V peak, which is the same level used to drive
headphones. The headphone output is a low impedance source, so it can
easily drive both headphones and a line level input. The only thing
missing is an independent level control, which is easy enough to work
around.

73, Jim K9YC
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