According to the Elecraft website, the rev C DSP board introduced the low 
frequency improvements that were then carried over to the rev D board.  So if 
you add the LPF module to a rev C (a simple addition), you have the equivalent 
of the rev D without the need for a board swap.

> 
> 
> You can do the DSP board swap if you want both.
> But if you are only interested in the high frequency end, Elecraft provides 
> an inexpensive kit to add the LPF to your existing DSP board. That was my 
> choice because I was not interested in the extended low frequency response.
> 
> 

Grant NQ5T
K3 #2091, KX3 #8342



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