[Elecraft] K1 for 17/15 question

[Jessie Oberreuter]

On Thu, 29 Apr 2004, Mike Morrow wrote:

> >The 4 band board is really two sets of two bands where each band set
> >always has the cap for the the higher of the two bands permanently
> >switched in, and the lower band cap(s) added when the lower band is
> >selected (see schematic on-line).  With a little fiddling, you can come up
> >with a wide variety of configurations.
>
> That's true only if you ignore the changes needed to the transmitter output
> filter networks to accomodate any other choices.

     Sorry, yes, in addition to the four pre-mix and RF filters, you will
need to make sure the output filters accomodate your bands as well, and
this is where the number of options dwindles.  We should, however, be able
to add 15/17/20/30 to the list of combinations that the board can natively
support, eg remove C13,C14 and CN,CP, replace C11,C12 and CM,CL with them,
replace C10 with a 2pf cap, and then re-work the 40/30 low-pass filter.
     Folks who can get crystals for 10/12 experiements could also come up
with some useful combinations.  Too bad we can't run cw on 60m :).