[Elecraft] Fw: Hardware Differences K3

[Bob Cunnings]

Hmmm, no mention of the (hardware) AF low pass filter in the
announcement quoted below... can Elecraft confirm/deny? There is no
documentation of the K3DSPUPGD option on the order page, and nothing
in the "K3 Alerts, Enhancements and Application Notes" page either.

Bob NW8L

On Wed, Dec 16, 2009 at 1:56 PM, Steve Ellington <n4lq at carolina.rr.com> wrote:
> We started shipping the current DSP boards, Rev C, approximately March
> 6th, 2009.
> Any K3 DSP board Rev C or later will have the extended low end audio
> frequency response h/w enhancement.
>
> This corresponds approximately to K3 serial number 2800, plus or minus
> 10-20. Since assembled -Fs and kit K3s flow through different
> manufacturing paths, there is a slight variance in s/n for the phase-in.
> If in doubt, check the DSP board Rev as noted above.
>
> These changes basically added additional h/w low end frequency response
> below 300 Hz. You need to also have the latest K3 f/w to take advantage
> of this. Of course, you can also tailor (and limit) your RX and TX
> response via the K3's IF Shift and B/W controls and by using the TX and
> RX Equalizer entries.
>
> A picture of the Rev label location on the DSP board and additional info
> is at:
> http://www.elecraft.com/K3/mods/dsp_rev_c_information.htm
>
> (The 'C', or later, revision letter at the bottom of the label is what
> is important.)
>
> We have added to our parts and mod kits page an option, K3DSPUPGD to
> swap out your current DSP for one upgraded to the latest Rev C changes.
> The cost will be $69.00 plus shipping. Order placed via this page will
> start shipping approximately in 4 weeks, around Nov 9.
>
> Steve
> N4LQ
> N4LQ at carolina.rr.com
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