[K3] A suggestion for the K3 SSB audio

[dj7mgq]

I just had what might be a nice idea for those, who like myself, feel  
that the K3 could do with better speech processing.

It might be an idea to allow routing the the front or rear panel  
microphone input, after the microphone gain adjustment/control to the  
LINE OUT socket and route LINE IN to the normal SSB processing. This  
could allow one to add an external stage of processing:

mic -> K3 in -> mic gain -> line out -> black box -> line in -> ssb processing

Good idea? Bad idea? A possible distant future to do?

vy 73 de toby



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[Gary Hvizdak]

At 04:28:15 EST on Mon 18 Feb 2008, Toby Deinhardt (DJ7MGQ) wrote ..


... allow routing the front or rear panel microphone input, after the
microphone gain adjustment/control to the LINE OUT socket and route LINE IN
to the normal SSB processing.  This could allow one to add an external stage
of processing:

mic -> K3 in -> mic gain -> line out -> black box -> line in -> ssb
processing

Good idea?  Bad idea?  A possible distant future to do?

--

Toby,

    Sounds okay, but you can essentially do the same thing now simply by
foregoing the K3's mic gain stage, i.e. ...

mic -> black box -> K3 in -> ssb processing

    However, what I don't know without referring to the K3 schematics, is
where in the chain the TX EQ and Compression are applied?  If either or both
are in the K3's "mic gain" stage, that would make your suggestion that much
more desirable.

    BTW, what exactly do you envision this black box doing?  Is it
implemented in hardware or in software?  Might it be better to implement it
within the K3's firmware?

73,
Gary  KI4GGX

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[AD6XY]

I would put it in the microphone lead.

The most successful method I have come across for improving readability of signals when SSB is not getting through is to use CW. I would like to be able to use my morse key in SSB mode without doing anything except pressing the key. I know I can do this with an audio oscillator injected into the SSB chain, but with DSP it ought to be easy to just generate it at the IF.

Mike

dj7mgq wrote

I just had what might be a nice idea for those, who like myself, feel  
that the K3 could do with better speech processing.

It might be an idea to allow routing the the front or rear panel  
microphone input, after the microphone gain adjustment/control to the  
LINE OUT socket and route LINE IN to the normal SSB processing. This  
could allow one to add an external stage of processing:

mic -> K3 in -> mic gain -> line out -> black box -> line in -> ssb processing

Good idea? Bad idea? A possible distant future to do?

vy 73 de toby



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[dj7mgq]

>     BTW, what exactly do you envision this black box doing?  Is it
> implemented in hardware or in software?  Might it be better to implement it
> within the K3's firmware?

No real idea (yet). Think of it something experimental under the end  
users control/development.

vy 73 de toby

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[dj7mgq]

> Ah, in the true ham spirit!  :>)  Then for now I'd suggest just  
> skipping the K3's mic gain stage.

The mic gain stage gives you an easy front panel control and the line  
out a defined level for the input of the "black box" was my thinking...

I thought it was worth floating the idea - maybe Wayne will like it,  
maybe he won't.

vy 73 de toby

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[dj7mgq]

Hi Brett,

> Why not just run the mic into the box then the box into the radio and
> use the mic gain to match the output of the box to the radio?

One reason would be that one wants use the the K3's TX equalizer  
before doing any external processing. It would depend on what's  
possible, and how and if Elecraft might implement such a function.

Like I said, I just wanted to float the idea, because I felt it might  
be neat. A bit like using the RX antenna in and out connections (KXV3)  
to add your own RX amps, filters and the like to the radio.

vy 73 de toby



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