I just completed the same installation Bill.  I bought an additional 500 Hz 
filter and paid to match two filters.  They both matched exactly to my original 
filters.  My installation went pretty well.  My DVR seems to work, but I have 
not been able to find any instructions for operating.  Maybe we are supposed to 
experiment and find out.  I installed the DVR first then the KRX-3.  I was 
surprised to learn that the SO239 and the BNC connectors cannot both be 
connected at one time.  There is only one input to the receiver. (Maybe 
everyone else knew it, but I didn't).  My KRX-3 kit said to install the second 
DSP board with one nylon and two steel screws.  The DVR kit gave me two more 
nylon screws with instructions to replace the steel screws in the DSP so I used 
the nylon screws.  It looks like very small clearance for the screw heads so 
apparently some people have had shorts.

Good luck with your installation.  The second receiver is interesting.  I 
plugged in some surplus Labtec computer speakers which seem to work well except 
that their plug is a little too small for the K3 jack.  I remember some posts 
about that several months ago.  I need to dig them out and see what kind of 
plugs I need to buy for replacement.

Willis 'Cookie' Cooke 
K5EWJ


--- On Sat, 12/20/08, aa1o <[email protected]> wrote:

> From: aa1o <[email protected]>
> Subject: [Elecraft] k3 matching filters
> To: [email protected]
> Date: Saturday, December 20, 2008, 2:30 PM
> I received the KRX3 and the DVR today and am about to
> upgrade my k3. I am 
> using the 2.7 if roofing filter in the main unit and
> requested and paid for 
> a matching filter for the sub receiver.
> The main receiver offset is -.97 but the new 2.k filter is
> marked -.93.
> My question is are these a match or did I get the wrong
> part?
> I would like to know before I install things because I
> would like not to 
> have to redo the installation if the part is wrong. Also
> its the week-end 
> before Christmas, and this would be a nice project for me
> over the Christmas 
> holidays as we are shut down from work until 5 January.
> Can anyone help me out?
> 
> -Bill AA1O
> k3 287
> k2 1740
> 
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