[Elecraft] KFL1-4 Options Question

[Don Wilhelm]

Curt,

Not practical.  Yes, that might work, but you would need to design your 
own board (or highly modify the KFL1-4 board).
The reason is in the Low Pass filters - there are only 2 - the board is 
wired for 2 bands to use the lower frequency LPF and two more bands use 
the higher LPF.  The lower band LPF has a cutoff somewhere near 11 MHz.  
The lower 2 bands use this LPF.  So the lowest low band must be higher 
than 1/2 the cutoff frequency - and in ham band language, that means 40 
and 30 are a good pair.  The higher band(s) Low Pass filter cutoff is 
just above the 15 meter band, so it is usable for any bands between 
about 12 MHz and 22 MHz - that means any two of 20, 17 and 15 meters. 
are the possibilities, but the board is wired so only 2 of these bands 
can be used.

You might want to consider a 4 band board plus an additional 2 band 
board - say for 80 and 17, and configure the 4 band board for 40, 30 and 
20,15m.  That would give you coverage from 80 thru 15 meters with a 
filter board swap.

73,
Don W3FPR

rhulett1 at comcast.net wrote:
> Since the KFL1-4 module allows either 17 or 15 selected at build time, I'm wondering whether building say ??,20,17&15 (leaving out 30M or 40M)is workable. It seems to me that this ought to work fine.  With sunspot count increasing, am wishing for 4 band module more focused to the higher bands.
>
> I personally find the K1 a really enjoyable little QRP rig to use, and have a bunch of gear dwarfing it's diminuative size sitting idle on the desk.  I actually like using  XIT on the K1 better than using split on my QRO rigs for working DX. Recently have had VK2, EA1, E51, 5N0, CT9, KL7, and GA5 QSOs with 3 watts on 17 and 15.  It would be nice to not need to change filters to QSO both of these bands. 
>
> 73, Curt KB5JO 
>   
>