[Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Gary Smith]

> While the 8 pole filters have a 'nominal offset' of zero, you may find 
> that to be perfect for diversity reception that you should find the 
> absolute offset difference between the 2 filters of the same width and 
> use half the difference as the offset.  With the 8 pole filters, any 
> offset will be small - but remember that 'nominal' does not equal 
> 'exact', and as far as diversity reception is concerned, you are dealing 
> with exact if there is to be no shift between the main and sub receivers.

I also have the sub and a full compliment of 8 pole filters. The 
narrowest is the 250 and the next up is the 1K.

I am wondering how I, without all those varieties of test gear can 
determine if indeed there is a significant offset that exists with 
the 8 pole filters in my K3 and if it exists to know how much it + or 
- it is. Of course I would need to be able to test both main & sub to 
know what the particulars are so I could properly adjust the ofset 
settings.

I do find using diversity is much better for CW copy than without.

Gary
KA1J