[Elecraft] Fw: Hardware Differences K3

[k4ia at aol.com]

Thanks for re-posting the info.  I am just not sure how much of a  
difference this makes to those of us who aren't too concerned about hi-fi  audio.  
If I'm listening to a CW note at 700hz, or normal SSB, can what's  below 
300hz really matter?
 
Buck
k4ia
 
 
 
In a message dated 12/16/2009 3:56:48 P.M. Eastern Standard Time,  
n4lq at carolina.rr.com writes:

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