KFL1-2 Band Choices

[JT Croteau-2]

Could someone help clear something up for me?

Are there any band choices on the KFL1-2 that are not compatible with
each other?  I can't find anything in the documentation that says
otherwise.  On my last K1, I had 40 and 80 meters on the same board.
It worked fine and I had no problems.  Now someone is telling me that
this combination shouldn't have worked and that only 80 & 15 can be
put on the same board.

Could someone help clear this up for me?  I am contemplating another
K1 but use 40 & 80 meters almost exclusively and want this combination
in the rig.

Thanks and 72

--
 JT Croteau, W6FO/1 - Manchester, NH
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[Mike Morrow-3]

>Are there any band choices on the KFL1-2 that are not compatible with
>each other?  I can't find anything in the documentation that says
>otherwise.  On my last K1, I had 40 and 80 meters on the same board.
>It worked fine and I had no problems.  Now someone is telling me that
>this combination shouldn't have worked and that only 80 & 15 can be
>put on the same board.

Whoever said that is *completely* incorrect and doesn't understand these circuits at all.

There are six *official* bands available from Elecraft for the two-band KFL1-2 board:  80m, 40m, 30m, 20m, 18m, 15m, though 160m/12m/10m are certainly possible if you brew it yourself.  ANY combination of two is OK.

Only on the four-band KFL1-4 board is there a strict limitation to the allowable band combinations to 40m/30m/20m/15m due to the cutoff frequencies of the elliptical low pass filters on the board.  But one benefit to the four-band board is that these LPFs are much sharper than the simple filtering on the two-band board.

73,
Mike / KK5F


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[Don Wilhelm-3]

That information source is incorrect.

The 2 band boards can be built for any 2 bands.

The 4 band boards OTOH, share components between 2 adjacent bands, so only
40/30 meters and 20/(17 or 15) meters may be used on the 4 band board.  Yes,
either of the band pairs on the 4 band board could be changed to another
band, but then it would only be usable as a 3 band board because the LPF
sharing will not allow differnet band combinations (i.e. 80 and 40 meters
cannot share a single low pass filter).

73,
Don W3FPR

> -----Original Message-----
>
> Could someone help clear something up for me?
>
> Are there any band choices on the KFL1-2 that are not compatible with
> each other?  I can't find anything in the documentation that says
> otherwise.  On my last K1, I had 40 and 80 meters on the same board.
> It worked fine and I had no problems.  Now someone is telling me that
> this combination shouldn't have worked and that only 80 & 15 can be
> put on the same board.
>
> Could someone help clear this up for me?  I am contemplating another
> K1 but use 40 & 80 meters almost exclusively and want this combination
> in the rig.
>
> Thanks and 72
>
> --
>  JT Croteau, W6FO/1 - Manchester, NH
>

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[JT Croteau-2]

Don and Mike

Thanks for confirming my initial thoughts.

--
 JT Croteau, W6FO/1 - Manchester, NH
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[Mike Morrow-3]

I wrote:

>Only on the four-band KFL1-4 board is there a strict limitation to the
>allowable band combinations to 40m/30m/20m/15m due to the cutoff
>frequencies of the elliptical low pass filters on the board.

I should have stated the actual allowable band combinations for the KFL1-4 as:

40m, 30m, and any two of 20m, 17m, or 15m.

For some reason, Elecraft doesn't claim the substitution of 17m for 20m as allowable, but it is.

Mike / KK5F
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