[Elecraft] K1-4 on 30/20/17/15 ?

[David Toepfer]

Well then, perhaps I'll just get back to thinking as to how much effort I wish
to put into it.  Thank you for clearing up my confusion over your reply.

David, k3tue
.


--- Mike Morrow <kk5f at earthlink.net> wrote:

> David wrote:
> 
> >Well, that just sways me back to the 'I won't bother with a K1 
> >(since I have a KX-1) position and just get a K2 next (even if
> >it is not quite a unquantifyable pure sounding as a K1). 
> 
> Well, David, I'm sorry to hear about anyone foregoing a K1.  It is my
> favorite QRP rig of the nine that I own, eight of which were put out by three
> other outfits.  In fact, it's my favorite of any QRP rig I've ever heard
> about.
> 
> The first technical hurdle you'd have to overcome wouldn't be all that hard: 
> Re-designing the lower-frequency receiver input/transmitter output LPF so
> that you could have 30m and 20m on that filter.  
> 
> The existing third-order elliptical filter rolls off steeply just above about
> 10.5 MHz.  You could use the "Elsie" freeware found at:
> 
>       http://tonnesoftware.com/elsie.html
> 
> to come up with something similar that rolled off near 14.5 MHz instead.  
> 
> With a little head-scratching and thought, the re-arrangement and value
> changes of fixed caps in the two other band-pass filters shouldn't be
> impossible for supportting 20m and 30m as band 1 and band 2.
> 
> My point was not that it would be impossible to do what you wanted, but just
> that it would take some work and re-design.
> 
> Good luck, what ever you decide.
> 
> Mike / KK5F
>