http://elecraft.85.s1.nabble.com/KX3-ADC-DAC-access-keyer-input-tp6703089p6705333.html
The RX analog I/Q output jack adds very little to the cost. It's a standard feature.
Internal option modules include the ATU, roofing filter, and internal battery pack with real-time clock (RTC).
(Totally off-topic: The RTC can wake-up the radio at a programmed time, turning the KX3 into a high-performance clock radio :)
> One fundamental attraction of Elecraft gear [out of a countable infinity
> of attractions, it seems] is its modularity ... you pay for what you
> want. You want an autotuner for your K2, you purchase the KAT2. Don't
> want it? Don't buy it, and your K2 still works, it just wants to see
> something close to 50 + j0 ohms at the SO-239. Maybe you already have
> another way to make that happen.
>
> I-Q digital output signals are important to some. Despite the fact that
> I actually know what quadrature signals are and what you can do with
> them, they are of zero interest to me and I really don't want to pay for
> them, however they might be implemented. I sincerely hope that the
> almost extreme modularity that, among many other things, makes Elecraft
> radios unique and highly desirable continues. If digital I-Q signals
> are a trivial cost, fine. If not, I hope they are implemented in a
> module and those for whom they're important can shoulder the cost.
>
> 73,
>
> Fred Jensen
> Auburn CA
>
> On 8/19/2011 2:54 PM, Jessie Oberreuter wrote:
>>
>> Yes, the I/Q data is already in digital form inside the KX3, so -- in
>> theory -- it should be easy to just pump it to the outside world in
>> digital form. The challenges are with the standards for that transfer.
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