My only point here was that "it depends"  --- on what rev level DSP board is 
already in the radio.  If you swap a "C" level board for a "D" level board you 
get the LPF.  If you swap a "B" level board you get both the LPF and improved 
LF response.  So it's key to know what rev level is in the radio to know what 
the impact of DIY'ing  the LPF or a swap will be. 

Grant/NQ5T


On Mar 8, 2010, at 2:59 PM, Joe Planisky wrote:

> Elecraft explains it pretty clearly at
> 
> http://www.elecraft.com/K3/mods/dsp_rev_c_information.htm
> 
> The original post was from someone who was going to do the board swap, but 
> decided to go with the user installed LPF option instead.  I pointed out (or 
> intended to) that the K3DSPUPGD (the board swap) included the improved low 
> frequency response modifications, whereas the K3DSPLPF (the user installed 
> LPF board) did not.
> 
> I guess what I should have said was that installing the K3DSPLPF option did 
> not change the low frequency response.
> 

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