KX1 typical power out (or, manual anomaly?)

[John Shadle]

After performing my repair last night, I read through parts of the
manual again and noticed this on p. 59 of the manual (my Rev. B as well
as the current version Rev. C) "With L2 at its optimal turns spacing
(for best harmonic rejection), 20 meter output will be about 0.3 to 0.6
watts lower than 40 meters."

The odd thing is that I am getting 1w less on 40m, *not* less power on 20m.

Is this typical (more power out on 20m than 40m) or could there be a
problem somewhere in my assembly?

I know that 4w on 20m and 3w on 40m is typical (and I'm fine with that),
but wouldn't you expect higher power on 40m according to this statement
in the manual?

-john W4PAH


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[Don Wilhelm-3]

John,

If everything in the low pass filter is correct, you will normally have
greater power out on 40 than on 20.  So do check all the capacitors in
the LPF area, be certain K2 is operating when on 40 (c48 and C49 are
switched to make contact with ground on the bottom end).  Then after all
that is checked, be certain you have the correct number of turns on L1
and L2.

Is is possible that you spread the turns on L2 too far - it may be worth
compressing them a bit to fine out.

73,
Don W3FPR

John Shadle wrote:

> After performing my repair last night, I read through parts of the
> manual again and noticed this on p. 59 of the manual (my Rev. B as well
> as the current version Rev. C) "With L2 at its optimal turns spacing
> (for best harmonic rejection), 20 meter output will be about 0.3 to 0.6
> watts lower than 40 meters."
>
> The odd thing is that I am getting 1w less on 40m, *not* less power on 20m.
>
> Is this typical (more power out on 20m than 40m) or could there be a
> problem somewhere in my assembly?
>
> I know that 4w on 20m and 3w on 40m is typical (and I'm fine with that),
> but wouldn't you expect higher power on 40m according to this statement
> in the manual?
>
> -john W4PAH
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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