[Elecraft] k2dsp operation

[Dale Boresz]

Hello Karin,

This is definitely not normal operation. Particularly in LPASS mode, you 
should hear virtually no difference between the "C" and "c" settings; 
the differences become more pronounced at the narrower filter settings, 
but even there, they are fairly subtle.

It sounds like one (or more) address lines on your DSPx module (the 
small piggy-back board) may be either open or shorted. It's also 
possible that one of the connections to the socketed chip may be failing.

If you're very comfortable with removing, and inserting firmware chips 
into sockets you might want to try the following. If not, then I'd wait 
to hear from Lyle Johnson who designed the KDSP2, to see what he 
suggests. As a first step, I'd suggest removing and re-installing the 
chip in it's socket. Note the orientation of the chip before you remove 
it, although it's 'keyed' by virtue of one of the corners being 
flattened rather than pointed. Then carefully remove the chip by gently 
prying alternatively between to opposing corners, which are accessible 
via two access slots at two corners of the socket, until the chip pops 
out. Of course, use a static wrist strap, or touch a large metal object 
before attempting to handle the DSP boards. Then, carefully re-insert 
the chip back into it's socket. Again, I wouldn't attempt this unless 
you are very comfortable working with these types of sockets.

-Dale / wa8sra

Karin Johnson wrote:

>Hi All:
>...  If I set the "C" to lower case "c"
>I now get audio from the receiver.  This is an unusal
>type of operation if I understand the process of the 
>DSP correctly.  ...
>  
>