[Elecraft] Odd question regarding the K1

[Don Wilhelm]

Pete,

The short answer is NO!

The KFL1-4 has Low Pass filters that are shared by two bands.  The lower 
bands are 40 and 30 meters, and the normal low pass filter has a cutoff 
frequency of about 11 MHz.

Yes, that LPF could be changed for a cutoff frequency of something like 
5 or 6 MHz to attenuate the 2nd harmonic of the 80 meter band, but if 
that is done, operation on 40 meters would not be possible using that 
LPF.  A combination of 80 and 60 meters would be possible, but not 80 
and 40 meters because the LPF would not be able to attenuate the 2nd 
harmonic of the 80 meter signal.

The best combination is to use the 4 band board for 40 and 30 as well as 
20 and your choice of 17 or 15 meters.  Then add the 2 band board for 80 
and whichever band (17 or 15 meters) that you did not include on the 4 
band board.

Changing the band boards is not a big deal unless the internal battery 
option is installed.  The only problem with the internal battery option 
is that one cannot as easily grasp the band board to remove it compared 
to the ease of removing it without the internal battery option.  I must 
admit that the difference is small, but something to consider.

73,
Don W3FPR

On 6/7/2013 11:28 PM, Peter N. Spotts wrote:
>
> I'm contemplating a K1 as my next QRP project. In thinking about the 
> band combinations, if one goes for the full six bands on two boards, I 
> wonder if it's possible to set the four-band board up for 80-40-20-15, 
> rather than 40-30-20-15/17. This assumes one buys all the boards at 
> the same time and has all the parts on hand. For casual contest 
> purposes, that would yield four bands instead of three without having 
> to open the case to swap boards. Can 80-meter parts live on the 
> four-band board? Or are they restricted to the two-band board?
>
> Yeah, I know...too much time on my hands!  ;-)
>
> With best regards,
>
> Pete
>