[Elecraft] [KX3] ADC/DAC access, keyer input

Thomas Horsten thomas at horsten.com
Fri Aug 19 12:16:52 EDT 2011


The digital stream could be provided in the form of a (logical) USB sound
card inside the K3, there is no need for a physical sound card as most USB
device controllers support defining your own endpoints etc. in the
software/firmware.

73, Thomas M0TRN

On 19 August 2011 16:52, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Phil,
>
> Is there an existing software application that would accept such a
> digital stream over USB?
> Yes, I know that is what logically happens when using a USB soundcard,
> but all the applications I know about require that the soundcard be
> defined - I for one am not up to writing my own application to process
> that digital stream.
>
> 73,
> Don W3FPR
>
> On 8/19/2011 11:37 AM, Phil Hystad wrote:
> > Actually, I can see how Elecraft might consider making their own
> separately boxed sound card interface to do what the original requestor
> wanted to do.  That is, take in the I/Q signal, digitize via the sound card,
> and present a USB interfaced digital number stream to the computer.
> >
> > So, Elecraft can do this but would they.  I am thinking if they are smart
> about business they would not bother.  I mean, who is going to buy this
> "box" when they have a sound card already built into their computer that
> would likely do the same job.  Or, there are a myriad of other external
> high-quality sound cards you can buy to do this job.
> >
> > Or, am I missing something -- easy to miss something because I am not
> sure I understood the purpose in the original question.
> >
> > Personally, I want my KX3 just the way that Eric and Wayne make it since
> they seem to be smart about this sort of thing.
> >
> > 73, phil, K7PEH
> >
> >
> > On Aug 19, 2011, at 8:26 AM, Christian KJ4VPK wrote:
> >
> >> Sound card USB chips are tiny... Plenty of them, too. Volume cost is
> very very low, too.  Making it an optional feature if it really breaks the
> bank..
> >>
> >> Not needing shielded analog cables seems like a beautiful thing.
> >>
> >> -----Original Message-----
> >> From: Don Wilhelm
> >> Sent: Friday, August 19, 2011 10:55 AM
> >> To: gmaxwell
> >> Cc: elecraft at mailman.qth.net
> >> Subject: Re: [Elecraft] [KX3] ADC/DAC access, keyer input
> >>
> >> I believe what you are asking for means full soundcard function in the
> KX3.
> >> That does not seem reasonable to me.
> >> Why should others who do not desire that internal function have to pay
> >> for it?  There are many (I would even say most) who want the KX3 for
> >> portable use (without dragging along a computer for a panadapter
> >> display), and that is its major design point as far as I can determine.
> >>
> >> Your "trickle charge" suggestion means a voltage booster circuit would
> >> have to be added, and many of them generate RF hash.
> >>
> >> Besides, I don't think there is room inside the KX3 for those things you
> >> are asking.  We are approaching the "Dick Tracy wrist radio" in the KX3
> >> - how much smaller can it get?  Many complain about the size of the K3
> >> buttons!
> >>
> >> 73,
> >> Don W3FPR
> >>
> >> On 8/19/2011 10:15 AM, gmaxwell wrote:
> >>> Tony Estep wrote:
> >>>> IF output connected over USB? Maybe you mean a BNC,
> >>>>
> >>> No. I mean USB, as in digital output, as is found on the USRP (for
> example).
> >>>
> >>> I see no attraction in yet another analog step that is only going to
> add
> >>> noise and interference, complicate PTT and control signaling,  and
> leave me
> >>> with a mess of more cables and boxes in order to interconnect it.
>  (What
> >>> netbook has stereo inputs? what netbook has inputs that aren't full of
> >>> spurious tones from the computer?)
> >>>
> >>> Conceivably the KX3 could be trickle charged (500ma at 5v) via a USB
> client
> >>> connection, meaning a complete computer-enabled mobile station could be
> >>> [antenna]-[kx3]-[netbook]-[power] which would be clean indeed.
> >>>
> >>>
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